An image rendering method based on brdf function linear filtering

Abstract

The invention discloses an image rendering method based on BRDF function linear filtering. The method comprises: creating a BRDF map; aimed at the BRDF map, creating texture cache, rasterizing geometrical triangles of each object to the texture cache; aimed at each texture pixel in the texture cache, calculating corresponding vMF distribution function parameters and ||r||; according to distribution of a normal in a scene, segmenting a region, the segmented texture pixel storing the vMF distribution function parameters corresponding to the region, splicing BRDF maps generated after segmentation to obtain BRDF maps which are performed by MIP-Map; aimed at each pixel in a to-be-rendered image, calculating the size of the region covered by the pixel, and thus obtaining a MIP-Map hierarchy corresponding to the pixel, then reading corresponding position information from the corresponding BRDF maps which are performed by MIP-Map, and rendering. Filtering is applied in real-time rendering, drawing quality is improved, and a calculation process is accelerated.

Description

technical field [0001] The present invention relates to the technical field of image rendering, in particular to an image rendering method based on BRDF function linear filtering. Background technique [0002] In real-time rendering, it is very important to correctly represent the details of the object. In order to reduce the amount of calculation and ensure the rendering effect of the object, normal maps and BRDF function graphs are usually used. [0003] Normal Map (Normal Map) is a widely used drawing technology. By using the normal map to store and express the subtle geometric changes on the surface of the object, it can greatly reduce the geometric complexity of the scene and reduce the amount of calculation during rendering. It can well preserve and express the details of the object surface, so it is widely used in various fields. BRDF function map (BRDF Map) is also a widely used rendering technology, which realizes complex geometric surface material changes by stori...

AI Technical Summary

Problems solved by technology

[0005] Traditional filtering methods include direct sampling and Mip-Map normal map filtering methods, but these methods will cause the loss of normal map information and BRDF function parameter information, so that the rendering program cannot accurately express the details of the object

[0006] To solve this problem, offline rendering methods often use very heavy supersampling to alleviate this problem, but it brings huge computational consumption

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