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Geometric shadow map method for triangle reconstruction

A triangle and shadow map technology, applied in image data processing, 3D image processing, instruments, etc., can solve problems such as aliasing and depth offset, achieve low pixel count, reduce storage space, reduce storage overhead and running time Effect

Active Publication Date: 2015-10-07
ZHEJIANG UNIV
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Problems solved by technology

[0016] Aiming at the deficiencies of existing shadow map methods for geometric reconstruction, the present invention provides a geometric shadow map method for triangle reconstruction that can avoid aliasing and depth offset problems and effectively ensure the accuracy of depth values

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  • Geometric shadow map method for triangle reconstruction

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Embodiment Construction

[0063] Such as figure 1 As shown, the technical solution adopted in the present invention is: a geometric shadow map method for triangle reconstruction, and its implementation steps are as follows:

[0064] 1) Draw the scene in the light source space, generate and store the geometric shadow map;

[0065] In the geometry shader stage of the drawing pipeline, a conservative rasterization function is added to save the occlusion triangle of each pixel and the three adjacent triangles of the occlusion triangle;

[0066] The geometric shadow map stores triangle information, which essentially replaces the discretely sampled depth information in the traditional shadow map method with continuous primitive geometry. Since the geometric shadow map is based on the geometric information generated by rasterization, it is still incomplete for the entire scene, which will cause some pixels to fail to find the corresponding occluder geometry in the shadow map. To compensate for this, the pre...

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Abstract

The invention discloses a geometric shadow map method for triangle reconstruction, and the method comprises the steps: (1) drawing a scene in a light source space, and generating and storing a geometric shadow map; (2) carrying out the compression of the obtained geometric shadow map based on a GPU, and obtaining a compressed geometric shadow map; (3) drawing a scene in a vision field, packaging pixels, carrying out triangle consistency check, and using a stored triangle to achieve the geometric reconstruction of the depth value of a pixel shading object; (4) comparing a pixel depth value in the light source space with the depth value of the shading object, obtaining a shadow calculation result, and completing the reconstruction of the geometric shadow map. Aiming at problems of deformation and depth deviation in a shadow map method, the method employs discrete scene raw triangular patches to represent and record the information of the shading object, and the invention provides the geometric shadow map method. While generating a high-quality shadow, the method has certain advantages over other algorithms in geometric data storage and expenditure and performance, and can meet the demands of real-time application better.

Description

technical field [0001] The invention relates to the field of computer graphics shadow drawing, in particular to a geometric shadow map method for triangle reconstruction. Background technique [0002] Shadow is one of the important research topics in the implementation of computer graphics rendering, it can increase the realism of synthetic images, and help users effectively distinguish the positional relationship of objects in the scene. Shadow map (shadow mapping, SM) and shadow volume (shadow volume) are the two main methods of shadow drawing. Among them, the shadow map method is the most widely used method in shadow drawing, but it uses discrete point sampling to obtain and record the depth information of shadow occluders, which will lead to problems of aliasing and depth offset. [0003] Dai et al. proposed the reconstructable geometry shadow maps (RGSM) method in 2008 to solve the problems of aliasing and depth offset in the shadow map method. Its main idea is: raste...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T15/60
Inventor 冯结青杜文俊梅井翔
Owner ZHEJIANG UNIV
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