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Cone tracing dynamic global illumination method based on cascaded texture

A global illumination and cascade technology, applied in image data processing, 3D image processing, instruments, etc., can solve the problems of existing algorithms such as the inability to balance the realism and real-time performance, the lack of outdoor scene performance, and the real-time performance to be improved. , to achieve the effect of realism requirements, real-time performance and efficiency improvement

Active Publication Date: 2018-09-14
HARBIN ENG UNIV
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AI Technical Summary

Problems solved by technology

[0006] Existing algorithms cannot achieve a balance in terms of realism and real-time performance, and a dynamic global illumination algorithm that can achieve both realism and real-time performance is needed;
[0007] The existing global illumination algorithm has certain limitations. It is not expressive enough in outdoor scenes, the efficiency is not high, and the real-time performance needs to be improved.

Method used

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  • Cone tracing dynamic global illumination method based on cascaded texture
  • Cone tracing dynamic global illumination method based on cascaded texture
  • Cone tracing dynamic global illumination method based on cascaded texture

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specific Embodiment 1

[0041] The present invention proposes to use a data structure combining cascaded textures (Texture cascades) and a sparse octree (SVO) to store voxels. Each voxel uses 3D G-Buffer to store geometric attribute information A={a i ,n i ,o i ,e i}, including reflectivity, normal, occupancy, and radiation. It is also necessary to set up the buffer V-buffer for storing direct lighting and reflected light.

[0042] Based on the description of the above problems, in order to achieve the purpose of the present invention, the present invention adopts the following steps, the overall flow chart is as follows figure 1 :

[0043] Step 001. Propose a voxel storage structure combining cascaded textures and sparse octrees. Aiming at the problem of difficulty in traversing sparse octrees due to the large number of voxels in large-scale scenes, divide the scene into levels according to the distance relationship within the viewing angle , select different storage structures for different l...

specific Embodiment approach 2

[0087] A cascaded texture-based cone tracing dynamic global illumination method, characterized in that it comprises the following steps:

[0088] (1) Construct a structure combining cascaded texture and sparse octree, and voxelize the scene, divide the scene into levels according to the distance relationship within the viewing angle, and select different storage structures for different levels to voxelize in batches;

[0089] (2) Inject light information into each voxel using a modified conic filter;

[0090] (3) Sampling through cone tracking in the screen space, filling the direct lighting buffer with lighting information, and then using the improved cone filter to perform several cone tracking from the world space position of each pixel to obtain indirect lighting;

[0091] (4) A targeted dynamic voxel update method is used to update the cascaded texture.

[0092] Described step (1) specifically comprises:

[0093] (1.1) Input scene P;

[0094] (1.2) Divide the scene P i...

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Abstract

The invention discloses a cone tracing dynamic global illumination method based on cascaded texture, and belongs to the graph real-time rendering field. The cone tracing dynamic global illumination method based on cascaded texture includes the steps: 1) constructing a structure in which cascaded texture is combined with sparse octrees, voxelizing the scenes, grading the scenes according to the farand near distance in the visual angel range, and selecting different storage structure to perform batched voxelizing for different grades; 2) injecting light information into each voxel by using an improved cone filter; 3) filling the direct illumination buffer area with the illumination information, through cone tracing sampling in the screen space, and then using the improved cone filter to perform several cone tracing from the world space position of each pixel to obtain indirect illumination; and 4) updating the cascaded texture by means of a targeted dynamic voxel updating method. The cone tracing dynamic global illumination method based on cascaded texture provides a targeted dynamic voxel updating method, can effectively implement the realistic demand of graph rendering, can greatly improve the rendering efficiency, and can achieve timeliness.

Description

technical field [0001] The invention belongs to the field of real-time rendering of graphics, and in particular relates to a cascaded texture-based cone tracking dynamic global illumination method. Background technique [0002] With the rise of VR / AR technology, application technologies such as video games, 3D movies, and holographic projections have developed rapidly and are closely integrated with human daily life. Humans have never been an imaginative animal, and we have never stopped describing and constructing virtual worlds. Nowadays, 3D blockbusters are becoming more and more shocking, and virtual reality experience is gradually approaching people's lives. AR technology not only shines in the Spring Festival Gala and other stages, but also attracts great attention from all walks of life and even the government. It can be said that VR / AR technology is gradually changing the way people live. [0003] For these media technologies, graphics rendering can be said to be t...

Claims

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Application Information

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IPC IPC(8): G06T15/04G06T15/50
CPCG06T15/04G06T15/506
Inventor 张菁张晓东王鹤赵珊珊
Owner HARBIN ENG UNIV
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