Subsurface scattering calculation method for semitransparent material rendering

A subsurface scattering and translucency technology, applied in calculation, 2D image generation, image data processing, etc., can solve the problems of drawing object limitation, large amount of data storage, and complex calculation formula, so as to avoid wrong estimation and sampling points Improperly distributed, faster calculations, rendering accurate effects

Pending Publication Date: 2021-11-19
BEIHANG UNIV
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Problems solved by technology

The physics-based analytical formula derives and approximates the reflection profile by deriving and approximating the radiative transfer equation. Although the calculation time is short, the calculation formula is still complex for real-time calculatio

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  • Subsurface scattering calculation method for semitransparent material rendering
  • Subsurface scattering calculation method for semitransparent material rendering
  • Subsurface scattering calculation method for semitransparent material rendering

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[0026] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the disclosure are shown in the drawings, it should be understood that the disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these examples are provided so that the understanding of this disclosure will be thorough and complete. It should be understood that the drawings and embodiments of the present disclosure are for exemplary purposes only, and are not intended to limit the protection scope of the present disclosure.

[0027] It should also be noted that, for the convenience of description, only the parts related to the related invention are shown in the drawings. In the case of no conflict, the embodiments in the present disclosure and the features in the embodiments can be combined with each other.

[0028] It should be noted that the ...

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Abstract

The invention discloses a subsurface scattering calculation method for semitransparent material rendering, and relates to cutting processing and polynomial fitting of brute Monte Carlo photon tracking experiment results so as to accurately represent energy attenuation of subsurface scattering on distance. On the basis, the average free path and the single scattering rate are used for carrying out relation determination on all terms in the multi-term fitting formula, so that calculation and adjustment of the reflection profile are facilitated. And finally, through a new real-time importance sampling scheme, the emergent radiation of any point on the surface of the object is calculated by using a Monte Carlo method, and the importance sampling scheme is also suitable for any other subsurface scattering calculation model. By combining a surface scattering calculation result with other results such as highlight reflection, any semitransparent material object can be accurately and efficiently drawn.

Description

technical field [0001] The invention relates to the field of realistic real-time rendering based on physics, in particular to a subsurface scattering calculation method for translucent material rendering. Background technique [0002] At present, in many application fields about skin rendering, such as games, VR (Virtual Reality, virtual reality) interaction and other scenes that require real-time rendering of objects, it is very important to perform more accurate translucent object rendering in a shorter time. The problem. In the realistic rendering of objects in the real world, the rendering equation proposed by Kajiya, which is generally referred to as the BRDF (Bidirectional Reflectance Distribution Function, bidirectional reflection distribution function) calculation model, can only consider the transmission behavior of light on the surface. The solution introduced here is subsurface scattering. How to efficiently and accurately calculate the subsurface scattering phe...

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Application Information

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IPC IPC(8): G06T11/00
CPCG06T11/00G06T15/506G06T15/30
Inventor 高阳梁仕宇郝爱民吴洪宇
Owner BEIHANG UNIV
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