BRDF (bidirectional reflectance distribution function) -based real-time subsurface scattering rendering method

A technology of subsurface scattering and surface scattering, which is applied in the field of real-time rendering of subsurface scattering, and can solve problems such as failure to achieve full-frequency illumination

Inactive Publication Date: 2012-01-11
BEIHANG UNIV
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Problems solved by technology

However, this method can only simulate the interactive scattering phenomenon of low-frequency light to a certain extent, and fails to achieve full-frequency illumination.

Method used

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  • BRDF (bidirectional reflectance distribution function) -based real-time subsurface scattering rendering method
  • BRDF (bidirectional reflectance distribution function) -based real-time subsurface scattering rendering method
  • BRDF (bidirectional reflectance distribution function) -based real-time subsurface scattering rendering method

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Experimental program
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Embodiment Construction

[0032] The process flow of the subsurface scattering real-time rendering method of the present invention is as follows: figure 1 As shown, the implementation method is as follows:

[0033] 1) Initial translucent material parameters

[0034] First define the material of the object. The material attribute parameters of translucent objects are different, resulting in different textures of the final drawn image. During the experiment, the invention uses the following parameter comparison table 1. The cubemap light source used is image 3 shown.

[0035] Table 1 Comparison table of experimental material parameters

[0036]

[0037] 2) Draw a single subsurface scattering color texture

[0038] Draw a full-screen quadrilateral, approximate the single-subsurface-scattering light component of the material according to the single-subsurface-scattering drawing equation (1), and draw the result to the color texture L ss middle.

[0039] In order to calculate the color value of ...

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Abstract

A BRDF (bidirectional reflectance distribution function) -based real-time subsurface scattering rendering method includes the following steps: firstly, decomposing an illumination model into a Phone model, a scattering model and compensated illumination; secondly, improving a subsurface scattering model: adopting the BRDF method to approximate single subsurface scattering in subsurface scattering, and by simplifying an integral, simplifying a great deal of calculation load brought by the conventional illumination model to increase the rendering efficiency; and finally, rendering subsurface scattering in real time: by introducing the idea of deferred shading and adopting the GPU (graphics processing unit) technology, rendering subsurface scattering in an image space in real time is completed. The BRDF-based real-time subsurface scattering rendering method adopts the BRDF approximation method, realizes the real-time property of subsurface scattering rendering, and enhances the calculation performance while guaranteeing realistic rendering.

Description

technical field [0001] The invention relates to real-time rendering of subsurface scattering, in particular to a rendering method related to Bidirectional Surface Scattering Reflectance Distribution Function (BSSRDF). Background technique [0002] The subsurface scattering phenomenon is a complex optical phenomenon unique to translucent objects. In physical simulation, the actual interaction between the translucent target material and light is particularly complicated, and the real simulation has not been done yet. At this stage, some simplified models have been proposed to simulate this complex optical phenomenon. At present, people mainly use pre-computation (PRT) or approximate simulation of multiple scattering in physical space to draw subsurface scattering, but both pre-calculation and approximate simulation in physical space will bring a lot of calculations, seriously It restricts the drawing efficiency of the algorithm. [0003] The current subsurface scattering ren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T15/50
Inventor 王莉莉李鸿飞沈哲郝爱民
Owner BEIHANG UNIV
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