Bidirectional texture function
Bidirectional texture function (BTF) [1] is a 7-dimensional function depending on planar texture coordinates (x,y) as well as on view and illumination spherical angles. In practice this function is obtained as a set of several thousands color images of material sample taken during different camera and light positions.
To cope with a massive BTF data with high redundancy, many compression method were proposed.[1][2]
Its main application is a photorealistic material rendering of objects in virtual reality systems.
See also
- BSDF == BRDF + BTDF, a 4+1 dimensional function of the scattering distribution from a single point/pixel/vertex.
- BTF Database Bonn and Measurement Lab
- CVPR 2010 BTF Modeling Tutorial
- BTFbase - BTF compression based on a multi-level vector quantization (free BTF shader)
- UTIA BTF Database - a new source of publicly available bidirectional texture function measurements
References
- ^ a b Jiří Filip (2009). "Bidirectional Texture Function Modeling: A State of the Art Survey". IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. 31, no. 11. pp. 1921–1940.
{{cite web}}: Unknown parameter|coauthors=ignored (|author=suggested) (help) - ^ Vlastimil Havran (2009). "Bidirectional Texture Function Compression based on Multi-Level Vector Quantization". Computer Graphics Forum, vol. 29, no. 1. pp. 175–190.
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