Real-time multi-scale high-frequency material rendering method and system based on normal mapping

Abstract

The invention discloses a real-time multi-scale high-frequency material rendering method and system based on normal mapping. The method comprises the following steps: collecting a to-be-rendered high-frequency material image; obtaining a normal map of the to-be-rendered high-frequency material image; determining a target normal map and a mapping structure based on the normal map of the to-be-rendered high-frequency material image; determining a corresponding current hierarchy based on the coloring point footprint and the mapping structure; according to the determined current level, upper and lower level Gaussian lobes corresponding to the current level are screened; calculating contribution values of the screened upper-level Gaussian lobes and lower-level Gaussian lobes; interpolation is carried out on the contribution values of the upper layer and the lower layer to obtain a final total contribution value, and then a direct illumination image of the high-frequency material to be rendered is obtained; and mixing the direct illumination image of the to-be-rendered high-frequency material with the denoised indirect illumination result image of the non-high-frequency material to obtain a final rendered image. A good rendering result is obtained by mixing direct illumination of a high-frequency material and indirect illumination of a common material after denoising.

Description

technical field [0001] The invention relates to the field of physics-based real-time micro-surface rendering technology, in particular to a real-time multi-scale high-frequency material rendering method and system based on normal maps. Background technique [0002] The statements in this section merely mention the background technology related to the present invention and do not necessarily constitute the prior art. [0003] Physically-based rendering simulates the interaction of different materials and light in the real world, and uses Bidirectional Reflectance Distribution Function (Bidirectional Reflectance Distribution Function, BRDF) to describe this process. The visual appearance of real-world materials with multi-scale surface features has received intense attention in computer graphics for decades. Under the classic microsurface theory, the surface of an object is a macroscopic surface composed of numerous irregularly distributed microsurfaces, and the objects obser...

AI Technical Summary

Problems solved by technology

[0004] In recent years, in the field of offline rendering, high-precision normal maps and other means can accurately simulate the normal distribution function of materials, and render high-quality results including high-frequency materials such as flickering, but at the same time, the rendering time is too long. Many problems such as excessive data memory overhead are not suitable for directly transplanting these offline rendering methods to the field of real-time rendering

[0005] The inventors have found that the existing real-time rendering methods are not consistent, and usually only use simple high-frequency geometric features as additional characteristics of materials, so that their appearance is limited to specific types of flicker (such as flicker caused by flake micro-surface features and Scratches) or anisotropic highlights, even if supplemented by texture maps, etc., can't get good results

In the actual application process, users need to choose different methods to process high-frequency materials according to their own needs, and it is impossible to use multiple high-frequency materials at the same time

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