CN111729304B - Method for displaying mass objects - Google Patents
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- CN111729304B CN111729304B CN202010457293.1A CN202010457293A CN111729304B CN 111729304 B CN111729304 B CN 111729304B CN 202010457293 A CN202010457293 A CN 202010457293A CN 111729304 B CN111729304 B CN 111729304B
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000009877 rendering Methods 0.000 claims abstract description 22
- 230000009471 action Effects 0.000 claims abstract description 12
- 238000004806 packaging method and process Methods 0.000 claims abstract description 3
- 230000008569 process Effects 0.000 claims description 6
- 230000001960 triggered effect Effects 0.000 claims description 3
- 239000000872 buffer Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012464 large buffer Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
Classifications
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63F—CARD, BOARD, OR ROULETTE GAMES; INDOOR GAMES USING SMALL MOVING PLAYING BODIES; VIDEO GAMES; GAMES NOT OTHERWISE PROVIDED FOR
- A63F13/00—Video games, i.e. games using an electronically generated display having two or more dimensions
- A63F13/50—Controlling the output signals based on the game progress
- A63F13/52—Controlling the output signals based on the game progress involving aspects of the displayed game scene
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63F—CARD, BOARD, OR ROULETTE GAMES; INDOOR GAMES USING SMALL MOVING PLAYING BODIES; VIDEO GAMES; GAMES NOT OTHERWISE PROVIDED FOR
- A63F13/00—Video games, i.e. games using an electronically generated display having two or more dimensions
- A63F13/50—Controlling the output signals based on the game progress
- A63F13/53—Controlling the output signals based on the game progress involving additional visual information provided to the game scene, e.g. by overlay to simulate a head-up display [HUD] or displaying a laser sight in a shooting game
- A63F13/537—Controlling the output signals based on the game progress involving additional visual information provided to the game scene, e.g. by overlay to simulate a head-up display [HUD] or displaying a laser sight in a shooting game using indicators, e.g. showing the condition of a game character on screen
- A63F13/5372—Controlling the output signals based on the game progress involving additional visual information provided to the game scene, e.g. by overlay to simulate a head-up display [HUD] or displaying a laser sight in a shooting game using indicators, e.g. showing the condition of a game character on screen for tagging characters, objects or locations in the game scene, e.g. displaying a circle under the character controlled by the player
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63F—CARD, BOARD, OR ROULETTE GAMES; INDOOR GAMES USING SMALL MOVING PLAYING BODIES; VIDEO GAMES; GAMES NOT OTHERWISE PROVIDED FOR
- A63F13/00—Video games, i.e. games using an electronically generated display having two or more dimensions
- A63F13/60—Generating or modifying game content before or while executing the game program, e.g. authoring tools specially adapted for game development or game-integrated level editor
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T13/00—Animation
Abstract
The invention discloses a method for displaying mass objects, which comprises the following steps: s1, outputting an image of the action of the model; s2, outputting the image to an atlas corresponding to the model, and calculating position information and size information of the image in the atlas; s3, calculating and storing offset coordinates and texture coordinates of the image in the atlas; s4, counting objects to be displayed, acquiring identification information of the objects and offset coordinates and texture coordinates of a model corresponding to the objects in a graph set for each object to be displayed, and calculating real coordinates; s5, packaging and sending the identification information, the offset coordinates, the texture coordinates and the real coordinates of the object obtained in the step S4 to a shader according to the model corresponding to the object, and rendering the model by the shader. The method has the advantages that the objects to be displayed and the real coordinates thereof are processed in batches before each frame is rendered, so that the same model adopts the same DrawCall, and the number of times of triggering the DrawCall is reduced.
Description
Technical Field
The invention relates to the technical field of information, in particular to a method for smoothly displaying mass objects in a mobile terminal.
Background
Currently, in various games, it is a common requirement to display a large number of repeated models on the same screen, for example, repeated presentation of characters, buildings, and plants is required to enrich or restore the content of the game. For mobile devices, the processor can only operate at low power consumption due to device size limitations. Most mobile phones display hundreds of 3D models on a screen at most, otherwise, equipment generates heat, the frame rate is reduced, the model is derived slowly and the like due to overlarge operand. In order to achieve the purpose of displaying more models, the prior art scheme mainly uses a game engine of Unity3D to display 2D pictures, and replaces a 3D model with frame animation of the 2D pictures for displaying.
On this basis, taking Unity3D as an example, the CPU may initiate a DrawCall command that receives the data to be rendered and informs the GPU to perform rendering directly or through a command buffer. As the number of models increases, both the number of dragcall times and the performance loss of the animation component itself become greater.
In order to reduce the number of DrawCall times, the closest patent application (application number: 201810085651.3, the name of the invention: a method for storing and rendering primitives in a game engine) proposes to perform hierarchical batch rendering through the front-back relationship among layers, so as to reduce the call of DrawCall during drawing; and a large buffer area is manually set, when an object is to be rendered, vertex information is stored in the buffer area, and when the buffer area is filled or texture memory of a texture resource manager is distributed, the vertices in the buffer area are thrown into a renderer for drawing at one time. According to the scheme, the optimal display effect is achieved by adjusting the rendering sequence, and the buffer mechanism is adjusted, so that triggering of a plurality of DrawCall when one model is rendered is avoided as much as possible, but the problem of reducing the calculation amount of a program per se, particularly vertex transformation calculation required by real-time rendering of a large number of models is not considered.
Disclosure of Invention
In order to overcome the defects in the prior art, all vertex calculation and texture coordinate calculation of the frame animation are optimized, drawCall of each model is combined into 1 DrawCall, and a great amount of real-time calculation and repeated calculation of a CPU are avoided. To this end, the invention provides a method of presenting a mass object.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a method of displaying a mass object, comprising the steps of:
s1, outputting an image of the action of the model;
s2, outputting the image to an atlas corresponding to the model, and calculating position information and size information of the image in the atlas;
s3, calculating and storing offset coordinates and texture coordinates of the image in the atlas;
s4, counting objects to be displayed, acquiring identification information of the objects and offset coordinates and texture coordinates of a model corresponding to the objects in a graph set for each object to be displayed, and calculating real coordinates;
s5, packaging and sending the identification information, the offset coordinates, the texture coordinates and the real coordinates of the object obtained in the step S4 to a shader according to the model corresponding to the object, and rendering the model by the shader.
The principle of the method is as follows: firstly, decomposing the model action into images of each frame, outputting the images into an atlas, and storing the images and the position information in the atlas for subsequent reading; on the basis of the image and its position information, offset coordinates and texture coordinates are calculated and also saved, thus completing the previous preparation work.
When the game is in progress, firstly counting objects to be displayed, directly acquiring offset coordinates and texture coordinates which are prepared in advance, and calculating real coordinates of the objects to be displayed on a real world map according to a specific process (such as combat) in the game; thus, all relevant information of the object is directly sent to the shader in a package before each frame is displayed, the shader obtains an image from the atlas according to the information and renders each frame of action of the model on the map.
Further, in the step S1, firstly, an animation of the motion of the model is obtained, and an image of each frame in the animation is read and sequentially input into the atlas;
wherein if the image is out of range of the atlas, the image is built and input to another atlas such that the model corresponds to a plurality of atlas.
Further, the size and position of the image of each frame after being input into the atlas can be set in a customized way.
Further, in the step S1, the image is a 2D sequence frame image of a model action, wherein a horizontal line at the right center of the image is a horizontal line when the model stands.
Further, the position information in the step S2 is the coordinates of one corner of the image, and the specific process of calculating the offset coordinates in the step S3 is as follows:
and acquiring the coordinates of one corner of the image, acquiring the length and the width of the image according to the size information, and calculating the coordinates of the other corner of the image opposite to the coordinates of the one corner of the image according to the length and the width of the image.
Further, texture coordinates are calculated based on the image width, the image height, the atlas width, and the atlas height.
Further, the specific process of step S5 is:
according to the model corresponding to the object, the identification information, the offset coordinates, the texture coordinates and the real coordinates of the object belonging to the same model are output as respective rendering primitives and recorded in the parameters of a single DrawCall command;
when all objects finish outputting rendering graphic elements and recording parameters, a DrawCall command and rendering graphic elements are sent to a shader, and the shader reads the graphic set of the model corresponding to the DrawCall command according to the DrawCall command and renders the objects by using the rendering graphic elements corresponding to the objects.
Further, in step S5, the shader reads the atlas according to the identification information of the object, acquires the image to be displayed from the atlas according to the offset coordinate obtained in step S4, and renders the image to be displayed according to the real coordinate and the texture coordinate.
Further, the step S3 stores the offset coordinates and texture coordinates in xml or json format.
Further, the step S4 is triggered at every frame update.
Further, the atlas takes the same size, with 1024 pixels wide and 1024 pixels high.
Further, the step S4 may be a batch process, and then the step S5 is triggered periodically according to a preset frame rate to send the identification information, the offset coordinates, the texture coordinates and the real coordinates of the object to the color former.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
firstly, extracting an image of each frame from an animation of a model, inputting the extracted image into an atlas, and presetting offset coordinates and texture coordinates so that a CPU (Central processing Unit) does not need to perform vertex transformation and texture switching calculation in real time; when the animation is played in real time, the 2D picture display component and the animation component which are carried by the engine can be abandoned, the common model rendering component is used, and meanwhile, the objects to be displayed and the real coordinates thereof are processed in batches before each frame is rendered, so that the same model adopts the same DrawCall, and the number of times of triggering the DrawCall is reduced.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method of the present invention for presenting a mass object.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the present patent;
it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical scheme of the invention is further described below with reference to the accompanying drawings and examples.
A method for displaying mass objects, as shown in fig. 1, firstly outputting an image of the action of a model; firstly, making an animation of a model action by an artist, and sequentially inputting 2D sequence frame images in the animation into a graph set through an atlas tool, wherein the horizontal line at the right center of the 2D sequence frame images is the horizontal line when the model stands; if the image is out of range of the atlas, the image is built and input to another atlas such that the model corresponds to multiple atlas. Thus, the action of the model may correspond to one or more atlases, and the artist may set the size and position of each frame of image input to the atlases by himself.
In this embodiment, the atlas tool is a Unity3D textureplacker, but the invention is not limited thereto, and similar tools in other tool libraries may be applied as well.
In the present embodiment, the atlas adopts the same size, in which the width is 1024 pixels and the height is 1024 pixels, but the present invention is not limited thereto; wherein the same dimensions are used as a preferred way of implementing the invention, while the choice of dimensions and aspect ratio does not affect the effect of the invention.
Then, the image is output to an atlas corresponding to the model, position information and size information of the image in the atlas are calculated, offset coordinates and texture coordinates of the image in the atlas are calculated and stored, and preparation operation of the atlas is completed.
Specifically, the texture coordinate calculation is exemplified as follows:
assuming that the left lower corner coordinates of a certain action picture in the atlas are (200, 300), the picture width 20, the height 30, the atlas size is 1024x1024, and the atlas coordinate system origin is the left lower corner of the atlas;
the lower left corner x coordinate of the picture texture coordinate is: the lower left corner x/atlas width, i.e. 200/1024= 0.1953;
the lower right corner x coordinate of the texture coordinate of the picture is: (lower left corner x+picture width)/album width, i.e., (200+20)/1024= 0.2148;
the lower left corner y coordinate of the picture texture coordinate is the lower left corner coordinate y/picture height, namely 300/1024=0.293;
the upper right corner y coordinate of the picture texture coordinate is (lower left corner coordinate y+picture height)/album height, i.e., (300+30)/1024=0.3222;
finally, the texture coordinates of the right lower corner, the right upper corner and the left upper corner of the picture are respectively obtained, (0.2148,0.293), (0.2148,0.3222) and (0.1953,0.3222).
In this embodiment, the position information is the coordinates of one corner of the image, and the length and width of the image are obtained according to the coordinates of one corner of the image and the size information, and the coordinates of the other corner of the image opposite to the coordinates of one corner of the image are calculated. The positional information of the present invention is not limited thereto, and may be other parameters that can determine the position of an image, such as the middle point of the image, and in the case where the image is held in a parallelogram, may be calculated from the image size as well.
Specifically, an example of calculating offset coordinates using position information is as follows:
assuming that the size of the original picture is 200 in width and 150 in height, the picture coordinate system takes the lower left corner as an original point, the lower left corner of an effective pixel of the model is (80, 40), and the upper right corner is (130, 120), and obtaining offset coordinates taking the original picture as a center point;
the lower left corner offset coordinates are: ((artwork width/2) -lower left corner x-coordinate, (artwork height/2) -lower left corner y-coordinate)
Taking the above data as an example: (200/2) -80=20, (150/2) -40=35, i.e. the lower left corner coordinates are (-20, -35);
the upper right corner offset coordinates are: (upper right-hand corner x-coordinate- (artwork width/2), upper right-hand corner y-coordinate- (artwork height/2));
taking the above data as an example: 130- (200/2) =30, 120- (150/2) =45, i.e. the upper right-hand corner coordinates are (30, 45);
and obtaining the left lower corner offset coordinate and the right upper corner offset coordinate, and determining the offset coordinates of other two points of the model picture.
And determining the offset coordinates, and then controlling the image size by multiplying different coefficients according to actual needs.
In this embodiment, the offset coordinates and texture coordinates are stored in xml or json format text, and may be stored in other ways, for example, in a database.
When playing a game and playing the animation of the object, counting the objects to be displayed, for each object to be displayed, acquiring offset coordinates and texture coordinates of images corresponding to all the objects before starting to display, and calculating real coordinates. Before each frame is displayed, for each object, the offset coordinates, texture coordinates and true coordinates of the object are directly packed into data, such as an array, and sent to a shader for batch rendering without real-time dynamic computation.
In this embodiment, each frame of picture of a certain action of the model of one object includes a front view and 8 direction views, wherein the 8 direction views are images obtained by adjusting the angles of the model by 45 degrees in the directions of up, down, left, right, up left, down left, up right, and down right with respect to the front of the model facing the camera as the facing angles of the model. Since the motion is set to be generally not more than 2 seconds, not more than 10 key frame pictures are output for the motion in 1 direction.
Finally, according to the model corresponding to the object, the identification information, the offset coordinate, the texture coordinate and the real coordinate of the object belonging to the same model are output as respective rendering primitives and recorded in the parameters of a single DrawCall command;
when all objects finish outputting rendering graphic elements and recording parameters, a DrawCall command and rendering graphic elements are sent to a color device, the color device reads an atlas of a model corresponding to the DrawCall command according to the DrawCall command, acquires an image to be displayed from the atlas according to offset coordinates of the rendering graphic elements, displays the image on a corresponding screen position which is actually output according to real coordinates, and finally renders the image to be displayed according to texture coordinates.
The applicant has carried out experimental comparison between the prior art and the scheme of the present invention, taking the example of displaying a total of 4900 units of 70x70 and the open shadow special effect at the same PC end, the following are specific:
for the program based on the existing scheme, the 2D frame Animation is realized, a tool is written to process and import the key frame of art output, then the key frame is converted into an Animation Clip of the Unity3D, and the Animation Clip is displayed by a 2D picture display component and an Animation component of the Unity 3D.
When the playing of the PC end reaches 2000 units, the existing scheme can not reach 20fps, and a great burden is caused to equipment.
Also based on 2D frame animation, but according to the procedure of the scheme of the invention, a frame rate of 120fps can be achieved when 4900 soldiers are displayed on the PC side, and a frame rate of 40fps-50fps can be achieved on the mobile side of the mobile phone.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (9)
1. A method of displaying a mass object, comprising the steps of:
s1, outputting an image of the action of the model;
s2, outputting the image to an atlas corresponding to the model, and calculating position information and size information of the image in the atlas;
s3, calculating and storing offset coordinates and texture coordinates of the image in the atlas;
s4, counting objects to be displayed, acquiring identification information of the objects and offset coordinates and texture coordinates of a model corresponding to the objects in a graph set for each object to be displayed, and calculating real coordinates;
s5, packaging and transmitting the identification information, the offset coordinates, the texture coordinates and the real coordinates of the object obtained in the step S4 to a shader according to the model corresponding to the object, and rendering the model by the shader;
the specific process of step S5 is:
according to the model corresponding to the object, the identification information, the offset coordinates, the texture coordinates and the real coordinates of the object belonging to the same model are output as respective rendering primitives and recorded in the parameters of a single DrawCall command;
when all objects finish outputting rendering graphic elements and recording parameters, a DrawCall command and rendering graphic elements are sent to a shader, and the shader reads the graphic set of the model corresponding to the DrawCall command according to the DrawCall command and renders the objects by using the rendering graphic elements corresponding to the objects.
2. The method for displaying mass objects according to claim 1, wherein in the step S1, an animation of the motion of the model is first obtained, and an image of each frame in the animation is read and sequentially input into the atlas;
wherein if the image is out of range of the atlas, the image is built and input to another atlas such that the model corresponds to a plurality of atlas.
3. A method of exposing a plurality of objects as recited in claim 2, wherein the size and location of the image of each frame after input to the atlas is customizable.
4. A method of presenting a mass object as claimed in claim 1, wherein in said step S1, said image is a 2D sequence of frame images of a model action, wherein the horizontal line at the very center of the image is the horizontal line when the model stands.
5. The method for displaying a mass object according to claim 1, wherein the position information in step S2 is coordinates of a corner of the image, and the specific process of calculating the offset coordinates in step S3 is as follows:
and acquiring the coordinates of one corner of the image, acquiring the length and the width of the image according to the size information, and calculating the coordinates of the other corner of the image opposite to the coordinates of the one corner of the image according to the length and the width of the image.
6. A method of exposing a mass object as recited in claim 1, wherein in said step S3 texture coordinates are calculated based on image width, image height, atlas width and atlas height.
7. A method for displaying a mass object according to claim 1, wherein in step S5, the shader reads an atlas according to the identification information of the object, acquires the image to be displayed from the atlas according to the offset coordinates obtained in step S4, and renders the image to be displayed according to the real coordinates and the texture coordinates.
8. A method of exposing a mass object as recited in claim 1, wherein said step S3 stores the offset coordinates and texture coordinates in xml or json format.
9. A method of exposing a mass object as recited in claim 1, wherein said step S4 is triggered at every frame update.
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