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* Remove obsolete comments in the Oren Nayar code.
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Thomas Dinges 2012-02-23 09:11:17 +00:00
parent 5ccbe5a7d0
commit f8c6f81271
1 changed files with 0 additions and 25 deletions
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intern/cycles/kernel/svm/bsdf_oren_nayar.h
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@ -16,31 +16,6 @@
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/*
* An implementation of Oren-Nayar reflectance model, public domain
* http://www1.cs.columbia.edu/CAVE/publications/pdfs/Oren_SIGGRAPH94.pdf
*
* NOTE:
* BSDF = A + B * cos() * sin() * tan()
*
* The parameter sigma means different from original.
* A and B are calculated by the following formula:
* 0 <= sigma <= 1
* A = 1 / ((1 + sigma / 2) * pi);
* B = sigma / ((1 + sigma / 2) * pi);
*
* This formula is derived as following:
*
* 0. Normalize A-term and B-term of BSDF *individually*.
* B-term is normalized at maximum point: dot(L, N) = 0.
* A = (1/pi) * A'
* B = (2/pi) * B'
*
* 1. Solve the following equation:
* A' + B' = 1
* B / A = sigma
*/
#ifndef __BSDF_OREN_NAYAR_H__
#define __BSDF_OREN_NAYAR_H__