Method for approximately drawing soft shadow of three-dimensional scene

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

Active Publication Date: 2015-02-11
CHANGCHUN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 approximately drawing soft shadow of three-dimensional scene
  • Method for approximately drawing soft shadow of three-dimensional scene
  • Method for approximately drawing soft shadow of three-dimensional scene

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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 v33.20GHz, 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. Such as 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 ...

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Abstract

The invention provides a method for approximately drawing a soft shadow of a three-dimensional scene. The method comprises the following steps of estimating planar surface light source visibility in a visible scene area by randomly sampling planar surface light sources, and reducing planar surface light source visibility noise introduced through random sampling by utilizing spatial convolution smooth denoising and filtering; utilizing a ray casting technology, calculating illumination contribution of the planar surface light sources visibility data to a visible scene point according to the obtained planar surface light source visibility data of the visible scene point, finally calculating a color value of the visible scene point based on the illumination contribution, and drawing a three-dimensional scene picture comprising the soft shadow. According to the method, the drawing quality of the three-dimensional scene picture can be ensured, and the drawing speed is improved.

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 Applications(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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