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Method for drawing approximate soft shadow of three-dimensional scene by utilizing position-sensitive visibility smooth filtering

A smooth filtering, three-dimensional scene technology, applied in 3D image processing, image data processing, instruments, etc., can solve the problem of approximate soft shadow realism is not very high

Active Publication Date: 2017-03-08
CHANGCHUN UNIV OF SCI & TECH
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  • Claims
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AI Technical Summary

Problems solved by technology

Many existing approximate soft shadow drawing methods cannot draw soft shadows with the above characteristics, so the realistic feeling of the approximate soft shadows drawn by them is not very high

Method used

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  • Method for drawing approximate soft shadow of three-dimensional scene by utilizing position-sensitive visibility smooth filtering
  • Method for drawing approximate soft shadow of three-dimensional scene by utilizing position-sensitive visibility smooth filtering
  • Method for drawing approximate soft shadow of three-dimensional scene by utilizing position-sensitive visibility smooth filtering

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Embodiment Construction

[0026] 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 embodiments.

[0027] 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, the disk selects Buffalo HD-CE 1.5 TU2, and the graphics card selects NVidia Quadro K2000; The computer operating system is Windows 7, and the software programming tool is VC++ 2010. In this embodiment, the number of pixel rows in the virtual pixel plane is 768, and the number of pixel columns in the virtual pixel plane is 1024; the three-dimensional scene is an indoor scene, and one directional point light source is used to illuminate the three-dimensional scene downward from the ceiling.

[0028] According to the process of the shadow mapping method, first place the camera at the position of the directional point light source, and make the front direc...

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Abstract

The invention relates to a method for drawing an approximate soft shadow of a three-dimensional scene by utilizing position-sensitive visibility smooth filtering. The method comprises the steps of determining a visibility filtering space width corresponding to each visible scene point according to the positions of a directional point light source, the visible scene point and a shielding point, and parameters such as the size of a virtual surface light source, the size of a virtual shielding ball and the like; performing the position-sensitive visibility smooth filtering on a binary visibility graph; and performing modulation on a direct illumination value, not considering the shielding, of the visible scene point by using a filtering result to obtain an actual direct illumination value of the visible scene point. According to the method, the approximate soft shadow with the softness changed with position change of a shadow projection object and a shadow receiving object can be drawn and better conforms to daily cognition of people.

Description

Technical field [0001] The invention relates to a method for realizing approximate soft shadow rendering of a three-dimensional scene by using position-sensitive visibility smoothing filtering, and belongs to the technical field of three-dimensional graphics rendering. Background technique [0002] Shadow is an important visual effect in a three-dimensional scene. It can provide the observer of the three-dimensional scene with information about the spatial position relationship between different three-dimensional objects. Shadow generation is the core operation in 3D scene rendering. In many real-time interactive 3D scene rendering applications, in order to obtain a rendering speed that can support real-time human-computer interaction, point light sources are often used to illuminate the 3D scene. The shadow of the 3D scene illuminated by the point light source usually presents a clear boundary. The 3D scene points are either in shadow or can be directly illuminated by the point...

Claims

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Application Information

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IPC IPC(8): G06T15/60
CPCG06T15/60
Inventor 陈纯毅杨华民蒋振刚李华
Owner CHANGCHUN UNIV OF SCI & TECH
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