CN110176055A - A kind of adaptive approach for the simulation real-time global illumination in 3D virtual engine - Google Patents
A kind of adaptive approach for the simulation real-time global illumination in 3D virtual engine Download PDFInfo
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- CN110176055A CN110176055A CN201910453097.4A CN201910453097A CN110176055A CN 110176055 A CN110176055 A CN 110176055A CN 201910453097 A CN201910453097 A CN 201910453097A CN 110176055 A CN110176055 A CN 110176055A
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- G06T15/00—3D [Three Dimensional] image rendering
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- G06T15/506—Illumination models
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Abstract
The present invention relates to a kind of for simulating the adaptive approach of real-time global illumination in 3D virtual engine, belongs to analogue technique field.A kind of adaptive approach for the simulation real-time global illumination in 3D virtual engine, method includes the following steps: S1: simulating the real-time global illumination of point light source；S2: the real-time global illumination of spotlight is simulated；S3: adaptive modeling global illumination.The present invention reduces the performance cost that virtual emulation software increases real-time global illumination function on the basis of guaranteeing 3D virtual scene authenticity significantly, and simulation effect can be adjusted according to nonidentity operation environment self-adaption.
Description
Technical field
The invention belongs to analogue technique field, be related to it is a kind of for simulated in 3D virtual engine real-time global illumination from
Adaptive method.
Background technique
Most of 3D virtual engine platforms provide the function of calculating real-time lighting for the virtual emulation software of exploitation, still
The calculation amount of this function consumption is extremely huge, in the environment of low operational capability, in such as virtual emulation software based on Web,
Software Caton can be caused even to be unable to run due to calculating real-time lighting.But the real-time of light source is not calculated in virtual emulation software
Illumination can make 3D virtual scene lack authenticity.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of for simulating real-time global illumination in 3D virtual engine
Adaptive approach.
In order to achieve the above objectives, the invention provides the following technical scheme:
A kind of adaptive approach for the simulation real-time global illumination in 3D virtual engine, this method includes following step
It is rapid:
S1: the real-time global illumination of point light source is simulated；
S2: the real-time global illumination of spotlight is simulated；
S3: adaptive modeling global illumination.
Further, the step S1 specifically:
It is modified according to Lambert Law to Blinn-phong illumination model:
Cspecular=(ClightMspcular) max (0, nl)；
Wherein, Cspcualr is the intensity of illumination after reflection；Clight is light source intensity of illumination；Mspecular is material
Reflection coefficient；Vector n is normal direction unit vector；Vector l is the unit vector of the ray negated；
A ray, detection collision, when ray detection is to when contacting object are respectively drawn in front and back six direction up and down
Position of collision point is obtained, a point light source is generated in Position of collision point, obtains the intensity of illumination of the point light source according to formula；According to
The unit vector and normal direction unit vector of ray, obtain reflection light direction, draw an indirect ray from the direction, then
Secondary generation point light source；It executes in total and generates point light source operation three times, generate six point light sources every time.
Further, the step S2 specifically:
According to the angle of spotlight, a ray is drawn in the center that spotlight shines, according to the side in step S1
Method successively executes generation and generates point light source operation simulation global illumination three times, but only generates a point light source in the operation of every step.
Further, the step S3 specifically:
According to the method for point light source in step S1 and S2 and spotlight simulation global illumination, in the scene one light of every addition
Source just will do it generates the operation of point light source to simulate global illumination three times；
All point light sources for defining a set PointLight storage addition, define three set, respectively
FirstPointLight, SecondPointLight and ThirdPointLight are added to store every when point light source respectively
Six point light sources that step operation generates；Define all spotlights of a set SpotLight storage addition；Define three collection
It closes, respectively FirstSpotLight, SecondSpotLight and ThirdSpotLight, respectively to store addition optically focused
The point light source that every step operation generates when source.
The beneficial effects of the present invention are: the present invention reduces significantly on the basis of guaranteeing 3D virtual scene authenticity
Virtual emulation software increases the performance cost of real-time global illumination function, and can according to nonidentity operation environment self-adaption tune
Mould preparation intends effect.
Other advantages, target and feature of the invention will be illustrated in the following description to a certain extent, and
And to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, Huo Zheke
To be instructed from the practice of the present invention.Target of the invention and other advantages can be realized by following specification and
It obtains.
Detailed description of the invention
To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention is made below in conjunction with attached drawing excellent
The detailed description of choosing, in which:
Fig. 1 is the real-time global illumination schematic diagram for simulating point light source；
Fig. 2 is the real-time global illumination schematic diagram for simulating spotlight；
Fig. 3 is adaptive modeling global illumination method flow chart.
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.It should be noted that diagram provided in following embodiment is only to show
Meaning mode illustrates basic conception of the invention, and in the absence of conflict, the feature in following embodiment and embodiment can phase
Mutually combination.
Wherein, the drawings are for illustrative purposes only and are merely schematic diagrams, rather than pictorial diagram, should not be understood as to this
The limitation of invention；Embodiment in order to better illustrate the present invention, the certain components of attached drawing have omission, zoom in or out, not
Represent the size of actual product；It will be understood by those skilled in the art that certain known features and its explanation may be omitted and be in attached drawing
It is understood that.
The same or similar label correspond to the same or similar components in the attached drawing of the embodiment of the present invention；It is retouched in of the invention
In stating, it is to be understood that if there is the orientation or positional relationship of the instructions such as term " on ", "lower", "left", "right", "front", "rear"
To be based on the orientation or positional relationship shown in the drawings, be merely for convenience of description of the present invention and simplification of the description, rather than indicate or
It implies that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore is described in attached drawing
The term of positional relationship only for illustration, is not considered as limiting the invention, for the ordinary skill of this field
For personnel, the concrete meaning of above-mentioned term can be understood as the case may be.
FIG. 1 to FIG. 3 is please referred to, to be a kind of for simulating the adaptive approach of real-time global illumination in 3D virtual engine.
1, the real-time global illumination of point light source is simulated
According to Lambert Law, (cosine value of angle is at just between the intensity and surface normal and light source direction of reflection light
Than) modify to Blinn-phong illumination model: Cspecular=(ClightMspcular) max (0, nl).
(Cspcualr: the intensity of illumination after reflection；
Clight: light source intensity of illumination
Mspecular: material reflection coefficient
Vector n: normal direction unit vector
Vector l: the unit vector of the ray negated)
A ray, detection collision, when ray detection is to when contacting object are respectively drawn in front and back six direction up and down
Position of collision point is obtained, a point light source is generated in Position of collision point, obtains the illumination of the point light source according to formula above
Intensity.According to the unit vector of ray and normal direction unit vector, reflection light direction is obtained, draws one instead from the direction
Ray generates point light source according to method as above again.It executes in total and generates point light source operation three times, generate six point light every time
Source.
2, the real-time global illumination of spotlight is simulated
According to the angle of spotlight, a ray is drawn in the center that spotlight shines, according to method above
It successively executes to generate and generates point light source operation simulation global illumination three times, but only generate a point light source in the operation of every step.
3, adaptive modeling global illumination method process
According to the method for above point light source and spotlight simulation global illumination, one light source of every addition will in the scene
The operation of point light source generate three times to simulate global illumination.
All point light sources for defining a set PointLight storage addition, define three set, respectively
FirstPointLight, SecondPointLight, ThirdPointLight are added to store every when point light source respectively
Six point light sources that step operation generates.Define all spotlights of a set SpotLight storage addition.Define three collection
It closes, respectively FirstSpotLight, SecondSpotLight, ThirdSpotLight, respectively to store addition optically focused
The point light source that every step operation generates when source.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to compared with
Good embodiment describes the invention in detail, those skilled in the art should understand that, it can be to skill of the invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of the technical program, should all be covered in the present invention
Scope of the claims in.
Claims (4)
1. a kind of for simulating the adaptive approach of real-time global illumination in 3D virtual engine, it is characterised in that: this method packet
Include following steps:
S1: the real-time global illumination of point light source is simulated；
S2: the real-time global illumination of spotlight is simulated；
S3: adaptive modeling global illumination.
2. it is according to claim 1 a kind of for simulating the adaptive approach of real-time global illumination in 3D virtual engine,
It is characterized by: the step S1 specifically:
It is modified according to Lambert Law to Blinn-phong illumination model:
Cspecular=(ClightMspcular) max (0, nl)；
Wherein, Cspcualr is the intensity of illumination after reflection；Clight is light source intensity of illumination；Mspecular is material reflection
Coefficient；Vector n is normal direction unit vector；Vector l is the unit vector of the ray negated；
A ray is respectively drawn in front and back six direction up and down, detection collision, when ray detection when contacting object to obtaining
Position of collision point generates a point light source in Position of collision point, obtains the intensity of illumination of the point light source according to formula；According to ray
Unit vector and normal direction unit vector, obtain reflection light direction, draw an indirect ray from the direction, then it is secondary
At point light source；It executes in total and generates point light source operation three times, generate six point light sources every time.
3. it is according to claim 2 a kind of for simulating the adaptive approach of real-time global illumination in 3D virtual engine,
It is characterized by: the step S2 specifically:
According to the angle of spotlight, draw a ray in the center that spotlight shines, according to the method in step S1 according to
Secondary execution generates and generates point light source operation simulation global illumination three times, but only generates a point light source in the operation of every step.
4. it is according to claim 1 a kind of for simulating the adaptive approach of real-time global illumination in 3D virtual engine,
It is characterized by: the step S3 specifically:
According to the method for point light source in step S1 and S2 and spotlight simulation global illumination, one light source of every addition is just in the scene
It will do it and generate the operation of point light source three times to simulate global illumination；
All point light sources for defining a set PointLight storage addition, define three set, respectively
FirstPointLight, SecondPointLight and ThirdPointLight are added to store every when point light source respectively
Six point light sources that step operation generates；Define all spotlights of a set SpotLight storage addition；Define three collection
It closes, respectively FirstSpotLight, SecondSpotLight and ThirdSpotLight, respectively to store addition optically focused
The point light source that every step operation generates when source.
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