Method for approximating soft shadows in 3D scenes

A three-dimensional scene, soft technology, applied in the field of computer three-dimensional graphics rendering

Active Publication Date: 2017-02-22
CHANGCHUN UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

However, ideal point light sources do not exist in real life, and most light sources have certain spatial dimensions

Method used

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  • Method for approximating soft shadows in 3D scenes
  • Method for approximating soft shadows in 3D scenes
  • Method for approximating soft shadows in 3D scenes

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Embodiment Construction

[0044] In order to make the features and advantages of the present invention clearer, the present invention will be further described below in conjunction with specific examples.

[0045] In this embodiment, the CPU of the computer system selects Intel(R) Xeon(R) CPU E3-1225 v3@3.20GHz, the memory selects Kingston 8GB DDR3 1333, and the disk selects Buffalo HD-CE 1.5 TU2; the computer operating system selects Windows 7 , the software programming tool uses VC++2010.

[0046] The object of the present invention is to provide a method for approximately rendering soft shadows in a three-dimensional scene. This method requires that the surfaces of all geometric objects in the 3D scene are of the Lambertian diffuse reflection type. like figure 1 As shown, the 3D scene is illuminated by a plane light source, p 1 and p 2 are two adjacent visible scene points, p 1 and p 2 There is partial occlusion with the plane light source, so p 1 and p 2 are in the penumbra; figure 2 As s...

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Abstract

The present invention provides a method for approximately rendering soft shadows in a three-dimensional scene. This method estimates the visibility of the planar light source in the visible scene area by random sampling of the planar light source, and uses spatial convolution smoothing and denoising filtering to reduce the visibility noise of the planar light source introduced by random sampling; technology, according to the obtained visibility data of the plane light source of the visible scene point, calculate the illumination contribution of the plane light source to the visible scene point, and finally calculate the color value of the visible scene point based on this, and draw a soft Shaded 3D scene footage. The method can improve the drawing speed while ensuring the drawing quality of the three-dimensional scene picture.

Description

technical field [0001] The invention belongs to the technical field of three-dimensional graphics drawing by computer, and relates to a method for approximately drawing soft shadows of three-dimensional scenes. Background technique [0002] Shadows have an important impact on the realism of 3D scene pictures. It is an important clue for people to understand the spatial relationship between geometric objects in a 3D scene. When an ideal point light source is used to illuminate a 3D scene, the spatial occlusion between geometric objects will form hard shadows with clear boundaries on the surface of the occluded geometric objects, that is, there is a clear dividing line between the shadow area and the non-shadow area. However, there is no ideal point light source in real life, and most light sources have certain spatial dimensions. When a surface light source is used to illuminate a 3D scene, the spatial occlusion between geometric objects will form soft shadows with blurred ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T17/00
CPCG06T15/60
Inventor 陈纯毅杨华民李华蒋振刚曲福恒李岩芳
Owner CHANGCHUN UNIV OF SCI & TECH
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