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Graphics image rendering method and system with radiance self-transfer for low-frequency lighting environments

An image, environment technology, applied in the field of lighting and dimming, can solve the problem of unsuitable light source and so on

Inactive Publication Date: 2007-03-28
MICROSOFT TECH LICENSING LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Light synthesis becomes problematic; almost all of these techniques are not suitable for very large light sources

Method used

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  • Graphics image rendering method and system with radiance self-transfer for low-frequency lighting environments
  • Graphics image rendering method and system with radiance self-transfer for low-frequency lighting environments
  • Graphics image rendering method and system with radiance self-transfer for low-frequency lighting environments

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Experimental program
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Embodiment Construction

[0023] As shown in FIG. 1, a software structure of a computer graphics image presentation system 100 provides a real-time image presentation of a modeled object, which uses the mutual reflection and self-shading using the light self-transfer image presentation technology described herein. Generally, the software structure includes an integrated lighting simulator 120, a real-time image presentation engine 140, and a graphics display driver 180. A more comprehensive description of the light self-transfer demonstration technology is described below. The integrated lighting simulator 120 performs the pre-processing stage of the technology, which pre-calculates the light self-transfer data 140 from a geometric object model 110. The geometric module 110 can be a triangular mesh, a wave composite, or any other representation of the geometric shape of the modeled object. The real-time demonstration engine 140 then uses the pre-calculated light self-transfer data to demonstrate the modele...

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PUM

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Abstract

Real-time image rendering of diffuse and glossy objects in low-frequency lighting environments captures soft shadows, interreflections, and caustics. As a preprocess, a global transport simulator creates functions over the object's surface representing transfer of arbitrary, low-frequency source lighting into exiting radiance, but including global effects like shadowing and interreflection from the object onto itself. At run-time, these transfer functions are applied to the actual source lighting. Dynamic, local lighting is handled by sampling close to the object at every frame; the object can also be rigidly rotated with respect to the lighting and vice versa. Lighting and transfer functions are represented using low-order spherical harmonics. Functions for radiance transfer from a dynamic lighting environment through a preprocessed object to neighboring points in space further allow cast soft shadows and caustics from rigidly moving casters onto arbitrary, dynamic receivers.

Description

[0001] Part of the disclosure of this document contains copyrighted material. The copyright owner has no reason to refuse the drafting and copying by anyone disclosed by this copyright, as shown in the patent documents or records of the Patent and Trademark Office, but additionally reserves all copyrights, no matter what. Technical field [0002] The present invention relates to computer graphic image presentation technology, and focuses more on the lighting and dimming of modeled objects on the presented image. Background technique [0003] The illumination from area sources, soft shadows, and mutual reflections play an important role in the synthesis of realistic images. Unfortunately, the general method of synthesis in large-scale lighting environments (including Monte Carlo ray tracing, light energy transfer, or multi-channel demonstrations in a multi-point light source set) is not practical for real-time demonstrations. (Monte Carlo ray tracing is described by Cook, R, Porter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F9/455G06T15/60G06T15/80
Inventor P·P·J·斯隆J·M·辛德J·阔兹
Owner MICROSOFT TECH LICENSING LLC