CN106504315A - The method and apparatus of simulation global illumination - Google Patents
The method and apparatus of simulation global illumination Download PDFInfo
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- CN106504315A CN106504315A CN201611027685.4A CN201611027685A CN106504315A CN 106504315 A CN106504315 A CN 106504315A CN 201611027685 A CN201611027685 A CN 201611027685A CN 106504315 A CN106504315 A CN 106504315A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T15/00—3D [Three Dimensional] image rendering
- G06T15/50—Lighting effects
- G06T15/506—Illumination models
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T13/00—Animation
- G06T13/20—3D [Three Dimensional] animation
Abstract
This application discloses a kind of method and apparatus of simulation global illumination, the method includes:The destination object simulation for carrying out illumination render will be needed in scene to be output to be split as multiple building blocks;For any one building block, simulation surround the polyhedron of the building block, towards on polyhedral multiple target directions, analog video camera is imaged to scene respectively, obtains several scene images simulated from multiple target directions;For any one scene image, according to the pixel color of each pixel in scene image, the ambient light color information that polyhedron is can be generated on the target direction is determined;The ambient light color information that can be generated on the plurality of target direction based on the polyhedron, carries out illumination render to the building block that the polyhedron is surrounded, to obtain the lighting effect of the destination object.The scheme of the application can go out object lighting effect in the scene with real-time rendering, and more can really reflect the global illumination effect of object.
Description
Technical field
The application is related to technical field of image processing, more particularly to a kind of method and apparatus of simulation global illumination.
Background technology
Global illumination is very important research field in computer graphicss, by the mould to light conditions in the Nature
Intend, the illumination such as soft shadow, indirect refraction in seizure true environment produced by the multiple propagation (e.g., reflect and reflect) of light is imitated
Really, these effects can greatly reinforce the sense of reality of rendering result.Global illumination has been widely used in animation, virtuality at present
In the fields such as reality, game.
In the fields such as animation, virtual reality or game, except static object is (fixed in the scene in scene
Object or person etc.) outside, can also include substantial amounts of dynamic object (transportable object or person etc. in the scene).Right
For static object, global illumination can be realized by way of precomputation generates light-maps;But for dynamic right
As for, as which constantly can change position in the scene so that the light conditions that dynamic object is not subject in the same time
Constantly can change, particularly, in the field higher to requirement of real-time such as game or virtual reality, dynamic object meeting
Due to the difference of user's request, and it is uncertain that shift position is produced, so, just cannot be by previously generating light-maps
Mode determining light conditions of the dynamic object in diverse location point.
In order to determine the lighting effect of dynamic object, discrete space in scene typically can be analyzed at present in advance
Ambient light color at location point is simultaneously stored, and when needing to render the lighting effect of dynamic object in scene, can be called pre-
The ambient light information for first storing carries out illumination render to the dynamic object.However, prestoring different spatial point in scene
Ambient light information be necessarily required to take substantial amounts of memory space, cause the waste of storage resource;And, but in scene except
Outside static light source, also there are some dynamic light sources, such as some dynamic objects may become luminous body or dynamic object sheet
Body is exactly mobile light source, and so, dynamic object is in addition to being subject to the illumination of static light source and acting on, it is also possible to can be subject to other dynamics
The illumination effect of object, and the uncertainty due to dynamic light source self-position, discrete space in the scene for precomputing
During the ambient light color information of location point, the ambient light color of dynamic light source cannot be considered to locus point at all
Illumination effect, so as to the true lighting effect of dynamic object that cannot be rendered.
Content of the invention
In view of this, this application provides a kind of method and apparatus of simulation global illumination, goes out object with real-time rendering and exist
Lighting effect in scene, and more can really reflect the global illumination of object.
For achieving the above object, on the one hand, the embodiment of the present application provide a kind of simulation global illumination method, including:
The destination object simulation for carrying out illumination render will be needed in scene to be output to be split as multiple building blocks;
For any one building block, the polyhedron of the building block is surrounded in simulation;
Towards on polyhedral multiple target directions, analog video camera is imaged to the scene respectively, is obtained
To several scene images simulated from the plurality of target direction;
For the scene image simulated on any one target direction, according to each pixel in the scene image
Pixel color, determines that the polyhedron acts on one group of ambient light color information of the building block, obtains corresponding to described
Multigroup ambient light color information of multiple target directions;
Polyhedral multigroup ambient light color information is based on, the building block surrounded by the polyhedron
Illumination render is carried out, to obtain the lighting effect of the destination object.
On the other hand, the embodiment of the present application additionally provides a kind of device of simulation global illumination, including:
Object split cells, for will need the destination object simulation for carrying out illumination render to be split as in scene to be output
Multiple building blocks;
Space construction unit, for for any one building block, the polyhedron of the building block is surrounded in simulation;
Simulation image unit, for towards polyhedral multiple target directions, analog video camera is to institute respectively
State scene to be imaged, obtain several scene images simulated from the plurality of target direction;
Light color determining unit, for for the scene image simulated on any one target direction, according to the field
The pixel color of each pixel in scape image, determines that the polyhedron acts on one group of ambient light color of the building block
Information, obtains the multigroup ambient light color information corresponding to the plurality of target direction;
Illumination render unit, for being based on polyhedral multigroup ambient light color information, to the polyhedron
The building block for surrounding carries out illumination render, to obtain the lighting effect of the destination object.
Understand via above-mentioned technical scheme, in application embodiment, before output scene, will be to be rendered in scene
Destination object is modeled as being made up of multiple building blocks, and the polyhedron of each building block is surrounded in simulation respectively, is taken the photograph by simulation
Camera can obtain several discrete scene images, root from imaging to scene towards on polyhedral multiple target directions
The ambient light that polyhedron can be applied on the building block can be analyzed according to the pixel color of pixel in the scene image
Colouring information, is determined due to the pixel that each group of ambient light color information is all based on discrete scene image, and to discrete
The sample rate sampled of scene image can reach higher rank, so as to be conducive to improving the ambient light color that determines
Precision;And, in the embodiment of the present application, every width scene image is all real-time Simulation intake, combines in current scene and moves
State light source and static light source to polyhedral illumination effect for simulating, so, based on the work that these scene images are determined
Ambient light color information for building block in destination object is more accurate such that it is able to more really render target pair
The lighting effect of elephant.
Further, since the application simulated scenario image, and finally determine that polyhedron acts on composition portion based on scene image
The ambient light color of part is completed based on the Rendering of GPU, determines ambient light color relative to the Rendering based on CPU
Information, carries out rendering based on GPU and can greatly improve computational efficiency, reduces calculating time-consuming.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present application or technical scheme of the prior art, below will be to embodiment or existing
Accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of application, for those of ordinary skill in the art, on the premise of not paying creative work, can be with basis
The accompanying drawing of offer obtains other accompanying drawings.
A kind of composition structural representations of the Fig. 1 for computer equipment disclosed in the embodiment of the present application;
Fig. 2 is that a kind of possible structure composed of system of global illumination in simulated scenario disclosed in the embodiment of the present application is illustrated
Figure;
Fig. 3 is the flow process of one embodiment of the method for global illumination in a kind of simulated scenario disclosed in the embodiment of the present application
Schematic diagram;
Fig. 4 is the flow process of method another embodiment of global illumination in a kind of simulated scenario disclosed in the embodiment of the present application
Schematic diagram;
Fig. 5 a are the schematic diagram of the who object included in scene;
Fig. 5 b show the multiple cubical schematic diagram for surrounding multiple building blocks of who object in scene;
Fig. 6 shows a kind of composition structural representation of one embodiment of the device of simulation global illumination of the embodiment of the present application
Figure.
Specific embodiment
Accompanying drawing in below in conjunction with the embodiment of the present application, to the embodiment of the present application in technical scheme carry out clear, complete
Site preparation is described, it is clear that described embodiment is only some embodiments of the present application, rather than whole embodiments.It is based on
Embodiment in the application, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of the application protection.
The embodiment of the present application provides a kind of method and apparatus of simulation global illumination, and the method and device can apply to
To fields such as game, virtual realities, with the lighting effect that real-time rendering goes out object in scene.
Suitable for any computer equipment, e.g., the computer equipment can be outside to the method and apparatus of the present embodiment
The server of game services or virtual reality service is provided, or other possess the equipment of graphic processing data ability.
Such as Fig. 1, the be suitable for meter of the method and apparatus of global illumination in the simulated scenario of the embodiment of the present application is it illustrates
Calculate a kind of composition structural representation of machine equipment.In FIG, the computer equipment can include:Processor 101, memorizer
102nd, communication interface 103, display 104, input block 105 and communication bus 106.
Processor 101, memorizer 102, communication interface 103, display 104, input block 105 pass through communication bus
106 complete mutual communication.
In the embodiment of the present application, the processor 101 at least includes:Graphic process unit (GPU, Graphics
Processing Unit) 1012, GPU can be used for realizing in the embodiment of the present application that analog video camera carries out image to scene and takes the photograph
Take, generate the scene image of different directions;Or, realize at the related graph data such as image rendering, computing environment optical information
Reason.
Optionally, central processing unit (CPU, Central Processing Unit) can be included in the processor 101
1011, some related data processings are completed with secondary graphics processor, it is possible to achieve at the main data of the computer equipment
Reason operation, certainly, the central processing unit may be replaced with ASIC (application-specific
Integrated circuit, ASIC), digital signal processor (DSP), special IC (ASIC), ready-made programmable gate
Array (FPGA) or other PLDs etc..
It is used for depositing one or more than one program in memorizer 102, program can include program code, described program
Code includes computer-managed instruction.The memorizer may include high-speed RAM memorizer, it is also possible to also include non-volatile memories
Device (non-volatile memory), for example, at least one disk memory.
The communication interface 103 can be the interface of communication module, the such as interface of gsm module.
The display 104 can be used to show involved object in scene and other image informations;Can also show
By the information of user input, or it is supplied to the information of user, and the various graphical user interface of computer equipment, these figures
Shape user interface can be made up of combination in any such as figure, text, pictures.The display can include display floater, e.g., can
Think the display floater configured using forms such as liquid crystal display, Organic Light Emitting Diodes.Further, the display can be with
Including the touch display panel for possessing collection touch event.
The input block 105 can be used for the information such as the character of the user input of receives input, numeral, and produce and user
The relevant signal input of setting and function control.The input block can include but is not limited to physical keyboard, mouse, action bars
One or more in.
Certainly, the computer equipment structure shown in Fig. 1 does not constitute the restriction to computer equipment, counts in actual applications
Calculating machine equipment can be included than the more or less of part shown in Fig. 1, or combine some parts.
In a kind of application scenarios, the scheme of the embodiment of the present application can have the applications such as game, virtual reality in operation
Computer equipment output scene before, in real time to scene in object (preferably dynamic object) render.In this kind of scene
In, computer equipment determine scene to be output and to scene in dynamic object rendered can be by the computer equipment
Complete independently.Such as, game player is being calculated during single-play game is played using computer equipments such as mobile phone, platform computers
Machine equipment can carry out real-time rendering according to involved object in the game picture before output is per frame game picture,
And export the game picture comprising the object after rendering.
In another kind of application scenarios, the scheme of the embodiment of the present application is readily adaptable for use in terminal and is handed over server
Mutually, with the corresponding picture of end side output scene.In this kind of scene, end side scene to be output can be from server side
Obtain, and terminal can carry out illumination render to the object in the scene before the scene is exported.For the ease of understanding this Shen
Scheme please, below this kind of scene be suitable for the scheme of the application simply introduced, referring to Fig. 2, it illustrates this Shen
Please a kind of a kind of the be suitable for system composition structural representation of method of simulation global illumination.As shown in Fig. 2 the system can be wrapped
Include by the service system that at least a server 201 is constituted, and many station terminals 202.
Wherein, can store in the server 201 in service system for functions such as realization game or virtual realities
Contextual data, and in terminal request contextual data, contextual data is transferred to terminal.
The terminal 202 is used for representing the scene corresponding to the contextual data of server return, and the operation according to user, to
Server sends the renewal request for updating dynamic object position in the scene, the position of the dynamic object is entered with obtaining server
Scene after row renewal.
Further, the terminal 202 is before the scene that export server is returned, in addition it is also necessary to treat in the scene according to determining
The destination object for rendering, and using terminal in GPU simulation destination object is split as multiple building blocks, by simulation surround
The polyhedron of the building block, and towards on polyhedral multiple target directions, analog video camera is taken the photograph to scene respectively
Picture, obtains several scene images simulated from multiple target directions, then according to the picture of each pixel in scene image
Plain color, determines the ambient light color information that polyhedron is can be generated on the target direction, so as to be based on the polyhedron at this
The ambient light color information that can be generated on multiple target directions, carries out illumination wash with watercolours to the building block that the polyhedron is surrounded
Dye, to finally give the lighting effect of the destination object.
Certainly, in actual applications, the operation for destination object to be rendered in scene being rendered can also be by server
Completing, detailed process is similar to the implementation procedure of end side for side.
With reference to above general character, the method for the simulation global illumination of the embodiment of the present application is described in detail.
Referring to Fig. 3, a kind of schematic flow sheet of method one embodiment of simulation global illumination of the application is it illustrates, this
The method of embodiment can apply to computer equipment noted earlier, specifically can be by the GPU in the computer come complete
Into associative operation.The method of the present embodiment can include:
301, the destination object simulation for carrying out illumination render will be needed in scene to be output to be split as multiple building blocks.
Wherein, the scene corresponding to scenic picture during scene to be output is can be understood as to be output to display.Root
Different according to the field that is applied, the scene can be scene of game, or scene of virtual reality etc..
Multiple objects, e.g., stationary body, dynamic object, personage etc. can be included in the scene.By field in the present embodiment
The object for carrying out illumination render is needed to be referred to as destination object in scape, the destination object can be static object in the present embodiment,
It can also be dynamic object.Optionally, it is contemplated that static object can realize illumination wash with watercolours by being expected the light-maps for calculating
Dye, in the present embodiment, the destination object can refer in particular to the dynamic object for needing to carry out illumination render.Certainly, the application is implemented
In example the destination object determined can be one can also be multiple, but the illumination render for any one destination object
Process can be processed using the process step of the present embodiment.
It is understood that each destination object can be split as some compositions, each part may be considered
One building block, specific fractionation mode can be set as needed.It should be noted that the fractionation described in the present embodiment is simultaneously
Non- multiple ingredients are disassembled and be separated into destination object, and on destination object, only simulate the composition destination object institute
The multiple building blocks for needing.
Such as, when destination object is automobile, fractionation can be simulated in itself in the automobile, determines and constitute the automobile
The particular location of the multiple building blocks of car door, compartment, wheel etc..And for example, when destination object is behaved, composition can be simulated
Multiple tissues of human body, e.g., the body of human body composition are simulated and are split, obtain the head of group adult body, neck, four
Multiple building blocks such as limb, trunk.
In the embodiment of the present application, being simulated the purpose for splitting to destination object is, in order to subsequently determine respectively
Go out the lighting effect of each building block, and then the lighting effect by all building blocks in the destination object reflects the group
Into the lighting effect that part is overall, to obtain destination object more accurately lighting effect.
302, for any one building block, the polyhedron of the building block is surrounded in simulation.
The closing space that polyhedron is actually made up of multiple faces.The quantity in polyhedral face specifically having can be with
Set as needed, such as the polyhedron can be tetrahedron, cube or octahedron etc..
It is understood that scene is made up of a large amount of continuously points, and dynamic object lighting effect in the scene is
Determined by the ambient light colors of these continuous points, and the quantity due to putting in the space of scene place is very huge, at all
Can not possibly determine that ambient light colors of these continuous points are applied in real time by algorithm can present on dynamic object
Lighting effect.Therefore, in for the higher field of the requirement of real-time such as virtual reality, game, can be by abstract for scene for little
Closing space, and by the ambient light color in the little closing space residing for object, determine the lighting effect of dynamic object.Accordingly
, in order to determine the lighting effect of building block, the polyhedron for surrounding the building block can be simulated, to determine that this is more
The closing space of face body can be applied to the lighting effect on the building block.
303, on polyhedral multiple target directions towards this, analog video camera is imaged to the scene respectively, is obtained
To several scene images simulated from the plurality of target direction.
It is understood that the ambient light in closing space for any one polyhedron, corresponding to polyhedron
The optical signal that information is applied on the polyhedron with each pixel in scene is relevant, accordingly, it would be desirable to polyhedral towards this
On multiple target directions, analog video camera is shot towards the polyhedron to scene respectively, with the video camera by simulating
The shooting direction in the scene domain in the mould video camera and the optical signal in image pickup scope is captured, and by the light for capturing
Signal is presented in the image for simulating.In the embodiment of the present application, the image that analog video camera is generated is referred to as scene image.
Wherein, the target direction can be preset as needed, or from towards in polyhedral multiple directions
Multiple directions are randomly choosed out as target direction.
Further, the ambient light color information in polyhedral closing space can be by taking out from polyhedron
Discrete point or the ambient light color in face reflect, so, in analog video camera towards polyhedron taking the photograph to scene
During picture, the video camera that can arrange simulation is imaged to scene on the multiple target directions towards each face in polyhedron,
Or analog video camera is imaged to scene in the multiple directions towards multiple differences in the polyhedron.
In one implementation, can be towards in polyhedron not in the multiple directions of coplanar, analog video camera respectively
Image towards polyhedral not coplanar and to scene.Wherein, for any one face in polyhedron, the face can direction
Two contrary directions are distinguished outside radiant light and are shone, and therefore, it needs to be determined that going out the face, to act on this more in the embodiment of the present application
The ambient light color of the building block surrounded by face body.For the ease of distinguishing, the ambient light color in the face is applied to the multiaspect
The direction on building block that body is surrounded is referred to as the direction of illumination that the face acts on the building block, and the direction of illumination is from the face
Point to inside the polyhedron, and it is understood that in order to getting the light that the face is can be generated on direction of illumination
RST, needs analog video camera to image the face towards the contrary direction of the direction of illumination, that is to say, that direction should
The target direction in face is the direction for being internally pointed to the face from polyhedron, specifically, can be to point to be somebody's turn to do from polyhedron internal vertical
The direction in face.
Optionally, the environment that can be generated on the face is applied in order to reflect the point of all pixels in scene comprehensively
Light color, the video camera of simulation need to capture the scene domain corresponding to the face comprehensively, then the target direction towards the face can
Think from polyhedral center and be perpendicularly oriented to the direction in the face.
Such as, so that polyhedron is as cube as an example, then cube has six faces, and this six faces may correspond to six targets
Direction, so, for each face cubical, can be perpendicularly oriented on the direction in the face from cubical center, and simulation sets
Put video camera and imaged towards the face, by the simulation of the pixel color of the pixel in corresponding for face scene domain to taking the photograph
In the pixel of the image that camera is absorbed.
In another implementation, can be simulated on the multiple target directions towards difference in polyhedron respectively
Video camera is imaged towards polyhedral difference to the scene.Polyhedral particularity is considered, direction can be chosen
Multiple target directions on different summits in polyhedron.For, on the target direction corresponding to any one summit, can simulating and take the photograph
Camera is imaged towards the summit to scene.Specifically, it is contemplated that polyhedron summit acts on the composition that the polyhedron is surrounded
The direction of illumination of part is to point to direction inside the polyhedron, therefore, the target side on summit towards in polyhedron from the summit
To can be to point to the direction inside the polyhedron from the summit.
304, for the scene image simulated on any one target direction, according to each pixel in the scene image
Pixel color, determine that the polyhedron acts on one group of ambient light color information of the building block surrounded by the polyhedron, obtain
To the multigroup ambient light color information corresponding to the plurality of target direction.
It should be noted that due to simulating a width scene image respectively towards on polyhedral multiple target directions,
So, for the scene image simulated on any one target direction in the polyhedron is required to the behaviour that carries out the step 304
Make.
Wherein, for the scene image simulated on a target direction, based on pixel in the scene image
Pixel color can determine that polyhedron acts on the ambient light color on the building block surrounded by the polyhedron, and this group of ring
Border light color information is actually the ambient light that the polyhedron is can be generated on the direction of illumination contrary with the target direction
Color.
Wherein, according to the pixel color of each pixel in the scene image, determine the side of one group of ambient light color information
Formula can have multiple.Optionally, for the scene image simulated on a target direction, can pass through to the scene graph
As in, the pixel color of each pixel is averaged, and using the pixel color obtained by equalization as one group of ambient light face
Color.
Further, the pixel color of each pixel in scene image is averaged and can is:Progressively reducing should
Scene image, and the pixel color of each pixel in the scene image after reducing is equalized using Gaussian filter, until
Pixel color to a unit pixel.
305, based on polyhedral multigroup ambient light color information, the composition surrounded by the polyhedron
Part carries out illumination render, to obtain the lighting effect of the destination object.
For any one polyhedron, the polyhedron can be obtained by step 304 and act on what the polyhedron was surrounded
Multigroup ambient light color information of building block, and every group of ambient light color correspond to the polyhedron and act on the building block
One direction of illumination, so, multigroup ambient light color by the polyhedron on the multiple direction of illuminations to the building block
Information, it may be determined that go out to act on the lighting effect of the building block.
The pixel that discrete scene image is all based on due to each group of ambient light color information in the embodiment of the present application is true
Fixed, and the sample rate sampled by discrete scene image can reach higher rank, determine so as to be conducive to improving
The precision of the ambient light color for going out;Further, since the application simulated scenario image, and multiaspect is finally determined based on scene image
Body acts on the ambient light color of building block to be completed based on the Rendering of GPU, relative to the Rendering based on CPU come
Determine ambient light color information, carry out rendering based on GPU and can greatly improve computational efficiency, reduce calculating time-consuming.
Meanwhile, in the embodiment of the present application, every width scene image is all real time shooting, as such, it is possible to dynamic in comprehensive scene
Light source and static light source to polyhedral illumination effect for simulating, so, based on the effect that these scene images are determined
In destination object, the ambient light color information of building block is more accurate such that it is able to render destination object more real
Lighting effect.
It is understood that in the embodiment of the present application, the pixel of each pixel in the scene image for simulating
Color, in the position in the scene, scene with the video camera of simulation, in the range of the camera photography, each spatial point is former
The pixel color of beginning and original image vegetarian refreshments are relevant with the camera position of the video camera for simulating, and therefore, generate scene in simulation
During image, the pixel color of in the scene image that simulate each pixel can be determined based on the above information, with most
Throughout one's life into scene image.
By taking a target direction as an example, optionally, in one implementation for can first based on preset video camera
With the distance in polyhedron (e.g., polyhedral center, polyhedral summit or polyhedral face), simulation is determined in the scene
Space camera position of the video camera on target direction;Then, it is determined that original in the range of camera photography in scene
Pixel, wherein, for the ease of distinguishing, the space pixel in three-dimensional scene space in the range of camera photography is referred to as
Original image vegetarian refreshments;Finally, according to the pixel color of original image vegetarian refreshments, the location of pixels of original image vegetarian refreshments scape on the scene is relative to the sky
Between camera position first direction vector, and the corresponding to the shooting direction that imaged towards the polyhedron of the video camera
Two direction vectors, simulate obtained by video camera carries out image capture towards the polyhedron to scene each pixel in scene image
The pixel color of point.Wherein, the video camera is identical with the direction of target direction towards the shooting direction imaged by polyhedron, no
It is with part, the shooting direction of video camera can be video camera and the vector side corresponding to shooting focus in polyhedron herein
To.
It is understood that in the embodiment of the present application, in order to further improve the complete of follow-up determination dynamic object
The precision of office's lighting effect, the quantity of target direction are unsuitable very few.
Particularly, with face that when coplanar or different top point are not imaged towards in polyhedron, the polyhedron has or
The quantity on person summit is unsuitable very few, and optionally, the polyhedron of the encirclement building block that the embodiment of the present application can be simulated can be with
For cube.For the ease of understanding the scheme of the embodiment of the present application, to surround the polyhedron of building block as cube it is below
Example, is introduced to the scheme of the application.
Referring to Fig. 4, a kind of schematic flow sheet of another embodiment of image processing method of the application, this enforcement is it illustrates
The method of example can apply to foregoing computer equipment, and the method for the present embodiment can include:
401, obtain the information of scene to be output.
It is understood that in the field such as game or virtual reality, in computer equipment, each frame picture all correspond to
One scene, scene to be output can be understood as the scene corresponding to picture to be output.
402, the destination object of pending illumination render is determined from the scene.
In the embodiment of the present application, the object for needing to carry out illumination render in scene is referred to as destination object, the target pair
As being static object, or dynamic object.As a kind of preferred implementation, the destination object of the embodiment of the present application
It can be dynamic object.
Particularly, when the scene in the embodiment of the present application is scene of game, the destination object can be in scene of game
Game object.
403, according to the composition structure of destination object, the destination object simulation is split as multiple building blocks.
It is understood that the composition structure of destination object can characterize constitute the destination object each building block it
Between annexation, e.g., by taking human body as an example, all pass through between all parts of human body each joint be connected, therefore, in this enforcement
Can simulate and the destination object is divided, obtain the multiple of the destination object based on the composition structure of destination object in example
Building block.
404, for any one building block, simulate the cube for surrounding the building block.
In the present embodiment, it is introduced as a example by surrounding the closing space polyhedron of human body as regular cube.
As each building block is in the closing space that a cube is located, therefore, the light of each building block
May be considered according to effect is affected by the cubical ambient light color.
For the ease of understanding the spatial relationship of the cube for simulating and building block, Fig. 5 a and Fig. 5 b are may refer to, by
The object included in scene shown in Fig. 5 a is human body 501.In order to determine human body lighting effect in the scene, can divide respectively
The lighting effect of the body parts of the human body is analysed, to finally give the global illumination effect of the human body.Such as referring to Fig. 5 b, can
Constituted so that the human body 501 can be modeled as multiple tissues, such as Fig. 5 b, simulate the head of group adult body, arm upper
Articular portion, the lower articulating component of arm, the upper articular portion of leg, the lower articular portion of leg, buttocks and chest trunk etc.
Multiple building blocks, and each building block is surrounded by a cube 502 respectively so that human body is covered by multiple cubes 502
Lid.
405, for any one face in cube, on the target direction for pointing to the face from cube internal vertical,
Space camera position of the video camera towards needed for should be imaged is simulated in the face of the scene.
In the present embodiment, the locus point residing for the video camera of simulation is referred to as space camera position.Specifically, may be used
Based on analog video camera set in advance and the vertical dimension in face, to determine the video camera of simulation in the target direction towards the face
On the space camera position that imaged.
Wherein, when analog video camera is towards some face cubical, in order to video camera can be captured corresponding to the face
The scene information of spatial dimension, the target direction can be to be perpendicularly oriented to the target direction in the face from cube center.Accordingly,
Can be in perpendicular to the face and on the vertical line of the central point in the face with analog video camera, meanwhile, analog video camera and the face
The vertical dimension at center is predeterminable range.
406, determine the original image vegetarian refreshments in the range of the camera photography in the scene.
Wherein, area is carried out in order to be imaged the pixel in generated scene image with analog video camera to the scene
Point, the pixel in the scene in the range of camera photography is referred to as original image vegetarian refreshments.
407, according to the pixel color of original image vegetarian refreshments, the location of pixels of the original image vegetarian refreshments deducts the space camera position
Obtained difference is converted to the first direction vector obtained by unit vector, and the shooting direction of the video camera is converted to list
Second direction vector obtained by bit vector, simulates the pixel face of each pixel in the scene image that the video camera is absorbed
Color.
As original image vegetarian refreshments is original pixel in the scene, therefore, the pixel color of the original image vegetarian refreshments is
Know, the pixel color of the original image vegetarian refreshments in the scene can be directly obtained.
For the ease of distinguishing, in the embodiment of the present application, by the position of scape on the scene for original image vegetarian refreshments (coordinate bit in other words
Put) it is referred to as the location of pixels of the original image vegetarian refreshments.
Wherein, in the scene image, the pixel color of each pixel is:There is the original image of mapping relations with pixel
The pixel color of vegetarian refreshments is multiplied by the vector dot of the first direction vector and second direction vector.
In the embodiment of the present application, original image vegetarian refreshments location of pixels in the scene relative to the space camera position
One direction vector is specially:The location of pixels of the original image vegetarian refreshments deducts the difference obtained by the space camera position and is converted to list
Direction vector obtained by bit vector;Accordingly, the video camera is imaged towards the face corresponding to shooting direction second
Direction vector is specially:The video camera is converted to the direction vector obtained by unit vector towards the shooting direction of the face shooting.
408, the scene image is progressively reduced, and each picture in the scene image after reducing is equalized using Gaussian filter
The pixel color of vegetarian refreshments, until obtain the pixel color of a unit pixel, using the pixel color of the unit pixel as upright
Ambient light color in body on the face.
409, for any one building block in the destination object, according to positive three-dimensional six for surrounding the building block
Ambient light color information function on face in the building block, to render the lighting effect of the destination object.
410, the scenic picture for including the lighting effect of the destination object is exported in display.
It should be noted that Fig. 4 is introduced as a example by surrounding the polyhedron of each building block as cube, but
It is understood that when the situation for surrounding building block using other polyhedrons is similar to the present embodiment, difference is only in that many
When face body is different, the quantity for constituting the face that polyhedron has is different, and for the corresponding ambient light color in each face of determination
Process identical with the present embodiment, will not be described here.
It is understood that Fig. 4 is the analog video camera pair with the multiple target directions towards each face in polyhedron
Scene is introduced as a example by being imaged, but corresponding on the multiple target directions towards each summit in polyhedron, simulation
The process imaged to scene by video camera can be only in that setting with the similar process shown in Fig. 4 embodiments, difference
On the direction being oriented inside from each summit polyhedral to the polyhedron of video camera, and the scene for generation simulation
Image and scene image is processed, to determine that the process of the corresponding multigroup ambient light color of polyhedron is but identical
, will not be described here.
Below a kind of device of simulation global illumination provided in an embodiment of the present invention is introduced, one kind described below
The device of simulation global illumination can be with a kind of above-described method of simulation global illumination mutually to should refer to.
Referring to Fig. 6, a kind of composition structural representation of device one embodiment of simulation global illumination of the application is it illustrates
Figure, the device of the present embodiment can include:
Object split cells 601, for will need the destination object simulation for carrying out illumination render to tear open in scene to be output
It is divided into multiple building blocks;
Space construction unit 602, for for any one building block, the multiaspect of the building block is surrounded in simulation
Body;
Simulation image unit 603, for towards polyhedral multiple target directions, difference analog video camera pair
The scene is imaged, and obtains several scene images simulated from the plurality of target direction;
Light color determining unit 604, for for the scene image simulated on any one target direction, according to described
The pixel color of each pixel in scene image, determines that the polyhedron acts on one group of ambient light face of the building block
Color information, obtains the multigroup ambient light color information corresponding to the plurality of target direction;
Illumination render unit 605, for being based on polyhedral multigroup ambient light color information, to the multiaspect
The building block that body is surrounded carries out illumination render, to obtain the lighting effect of the destination object.
Optionally, the simulation image unit, including:
Towards determining unit, for determining towards polyhedral multiple target directions;
Position determination unit, for towards described any one target direction polyhedral, simulating the shooting
Machine imaged towards the polyhedron needed for space camera position, and execute the operation of pixel matching unit;
Pixel matching unit, for determining the original image vegetarian refreshments in the scene in the range of the camera photography;
Image simulation unit, the pixel face of the original image vegetarian refreshments for determining according to the pixel matching unit
Color, first direction vector of location of pixels of the original image vegetarian refreshments in the scene relative to the space camera position,
And the second direction vector imaged corresponding to direction that the video camera is imaged towards the polyhedron, simulate the shooting
Machine carries out the pixel color of each pixel in scene image obtained by image capture to the scene.
Optionally, location of pixels phase of the original image vegetarian refreshments that described image analogue unit is determined in the scene
For the first direction vector of the space camera position is:Target difference is converted to direction vector obtained by unit vector, its
In, the target difference is the difference obtained by the location of pixels of the original image vegetarian refreshments deducts the space camera position;
Corresponding to the shooting direction that the video camera that described image analogue unit is determined is imaged towards the polyhedron
Second direction vector be:Obtained by the video camera is converted to unit vector towards the shooting direction that the polyhedron is imaged
Direction vector;
In the scene image that described image analogue unit is determined, the pixel color of each pixel is:With the picture
The pixel color of the original image vegetarian refreshments of mapping relations that vegetarian refreshments has be multiplied by the first direction vector and second direction vector to
Amount dot product.
Optionally, the light color determining unit, including:
Light color determination subelement, for for the scene image simulated on any one target direction, by the field
In scape image, the pixel color of each pixel is averaged, and using the pixel color obtained by the equalization as multiaspect
One group of ambient light color information that body can be generated.
Optionally, the light color determination subelement, the pixel color of each pixel in the scene image is being entered
During row equalization, specifically for progressively reducing scene image, and equalized in the scene image after reducing using Gaussian filter
The pixel color of each pixel, until obtain the pixel color of a unit pixel.
Optionally, image unit is simulated, for the multiple target directions in the not coplanar towards in the polyhedron, mould respectively
Intend video camera to image the scene, obtain several scene images simulated from the plurality of target direction.
Optionally, the space construction unit is specifically, be used for for any one building block, simulation surrounds described group
Cube into part.
It should be noted that each embodiment in this specification is described by the way of going forward one by one, each embodiment weight
Point explanation is all difference with other embodiment, between each embodiment identical similar part mutually referring to.
For device class embodiment, due to itself and embodiment of the method basic simlarity, so description is fairly simple, related part ginseng
See the part explanation of embodiment of the method.
Finally, in addition it is also necessary to explanation, herein, such as first and second or the like relational terms be used merely to by
One entity or operation are made a distinction with another entity or operation, and are not necessarily required or implied these entities or operation
Between exist any this actual relation or order.And, term " including ", "comprising" or its any other variant meaning
Covering including for nonexcludability, so that a series of process, method, article or equipment including key elements not only includes that
A little key elements, but also other key elements including being not expressly set out, or also include for this process, method, article or
The intrinsic key element of equipment.In the absence of more restrictions, the key element for being limited by sentence "including a ...", does not arrange
Remove and also there is other identical element in process, method, article or the equipment for including key element.
The foregoing description of the disclosed embodiments, enables those skilled in the art to realize or using the present invention.To this
Multiple modifications of a little embodiments will be apparent for a person skilled in the art, and generic principles defined herein can
Without departing from the spirit or scope of the present invention, to realize in other embodiments.Therefore, the present invention will not be limited
It is formed on the embodiments shown herein, and is to fit to consistent with principles disclosed herein and features of novelty most wide
Scope.
The above is only the preferred embodiment of the present invention, it is noted that for those skilled in the art come
Say, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (12)
1. a kind of simulation global illumination method, it is characterised in that include:
The destination object simulation for carrying out illumination render will be needed in scene to be output to be split as multiple building blocks;
For any one building block, the polyhedron of the building block is surrounded in simulation;
Towards on polyhedral multiple target directions, analog video camera is imaged to the scene respectively, obtain from
Several scene images simulated on the plurality of target direction;
For the scene image simulated on any one target direction, according to the pixel of each pixel in the scene image
Color, determines that the polyhedron acts on one group of ambient light color information of the building block, obtains corresponding to the plurality of
Multigroup ambient light color information of target direction;
Polyhedral multigroup ambient light color information is based on, the building block that the polyhedron is surrounded is carried out
Illumination render, to obtain the lighting effect of the destination object.
2. method according to claim 1, it is characterised in that described towards polyhedral multiple target directions
On, analog video camera is imaged to the scene respectively, including:
Determine towards polyhedral multiple target directions;
Towards on described any one target direction polyhedral, simulate the video camera and imaged towards the polyhedron
Required space camera position;
Determine the original image vegetarian refreshments in the range of the camera photography in the scene;
According to the pixel color of the original image vegetarian refreshments, location of pixels of the original image vegetarian refreshments in the scene is relative to institute
State the first direction vector of space camera position, and corresponding to the shooting direction that images towards the polyhedron of the video camera
Second direction vector, simulate the video camera carries out obtained by image capture each pixel in scene image to the scene
The pixel color of point.
3. method according to claim 2, it is characterised in that location of pixels of the original image vegetarian refreshments in the scene
First direction vector relative to the space camera position is:Target difference is converted to direction vector obtained by unit vector,
Wherein, the target difference is that the location of pixels of the original image vegetarian refreshments deducts the difference obtained by the space camera position;
The video camera towards the polyhedron image shooting direction corresponding to second direction vector be:The video camera court
The direction vector obtained by unit vector is converted to the shooting direction of polyhedron shooting;
In the scene image, the pixel color of each pixel is:There is the original image vegetarian refreshments of mapping relations with the pixel
Pixel color be multiplied by the vector dot of the first direction vector and second direction vector.
4. the method according to any one of claims 1 to 3, it is characterised in that described according in the scene image each
The pixel color of pixel, determines that the polyhedron acts on one group of ambient light color information of the building block, including:
The pixel color of each pixel in the scene image is averaged, and by the pixel obtained by the equalization
One group of ambient light color information that color is can be generated as polyhedron.
5. method according to claim 4, it is characterised in that the pixel by each pixel in the scene image
Color is averaged, including:
Scene image is progressively reduced, and the pixel of each pixel in the scene image after reducing is equalized using Gaussian filter
Color, until obtain the pixel color of a unit pixel.
6. the method according to any one of claims 1 to 3, it is characterised in that described towards polyhedral multiple mesh
Mark direction, including:
From multiple target directions that the polyhedron is internally pointed to not coplanar in the polyhedron.
7. the method according to any one of claims 1 to 3, it is characterised in that described for any one building block, mould
Intend the polyhedron for surrounding the building block, including:
For any one building block, the cube of the building block is surrounded in simulation.
8. a kind of simulation global illumination device, it is characterised in that include:
Object split cells, multiple for the destination object simulation for carrying out illumination render will be needed in scene to be output to be split as
Building block;
Space construction unit, for for any one building block, the polyhedron of the building block is surrounded in simulation;
Simulation image unit, for towards polyhedral multiple target directions, analog video camera is to the field respectively
Scape is imaged, and obtains several scene images simulated from the plurality of target direction;
Light color determining unit, for for the scene image simulated on any one target direction, according to the scene graph
The pixel color of each pixel as in, determines that the polyhedron acts on one group of ambient light color letter of the building block
Breath, obtains the multigroup ambient light color information corresponding to the plurality of target direction;
Illumination render unit, for being based on polyhedral multigroup ambient light color information, surrounds to the polyhedron
The building block carry out illumination render, to obtain the lighting effect of the destination object.
9. device according to claim 8, it is characterised in that the simulation image unit, including:
Towards determining unit, for determining towards polyhedral multiple target directions;
Position determination unit, for towards described any one target direction polyhedral, simulating the video camera court
Space camera position needed for being imaged to the polyhedron, and execute the operation of pixel matching unit;
Pixel matching unit, for determining the original image vegetarian refreshments in the scene in the range of the camera photography;
Image simulation unit, the pixel color of the original image vegetarian refreshments for determining according to the pixel matching unit, institute
State first direction vector of location of pixels of the original image vegetarian refreshments in the scene relative to the space camera position, Yi Jisuo
The second direction vector corresponding to the shooting direction that video camera is imaged towards the polyhedron is stated, and the video camera is simulated to institute
Stating scene carries out the pixel color of each pixel in scene image obtained by image capture.
10. device according to claim 8 or claim 9, it is characterised in that the light color determining unit, including:
Light color determination subelement, for for the scene image simulated on any one target direction, by the scene graph
As in, the pixel color of each pixel is averaged, and using the pixel color obtained by the equalization as polyhedron institute
The one group of ambient light color information that can be produced.
11. devices according to claim 10, it is characterised in that the light color determination subelement, by the scene
When in image, the pixel color of each pixel is averaged, specifically for progressively reducing scene image, and filtered using Gauss
The pixel color of each pixel in scene image after the equalization diminution of ripple device, until obtain the pixel face of a unit pixel
Color.
12. devices according to claim 8 or claim 9, it is characterised in that simulation image unit, for towards the multiaspect
Multiple target directions of not coplanar in body, respectively analog video camera the scene is imaged, obtain from the plurality of target
Several scene images simulated on direction.
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