erebus: liberebus/src/brdf.cc annotate

erebus

semi-works ...

author	John Tsiombikas <nuclear@member.fsf.org>
date	Sat, 24 May 2014 06:12:57 +0300
parents	474a0244f57d
children	e49f4d7ad04c

rev	line source
nuclear@2	1 #include "brdf.h"
nuclear@2	2 #include "erebus_impl.h"
nuclear@2	3
nuclear@2	4 // ---- class Reflectance ----
nuclear@2	5 Reflectance::Reflectance()
nuclear@2	6 {
nuclear@2	7 }
nuclear@2	8
nuclear@2	9 float Reflectance::sample(const Vector3 &norm, const Vector3 &outdir, Vector3 *indir) const
nuclear@2	10 {
nuclear@2	11 *indir = sample_dir(norm, outdir);
nuclear@2	12 return eval(norm, outdir, *indir);
nuclear@2	13 }
nuclear@2	14
nuclear@2	15 // --- class LambertRefl ---
nuclear@2	16 Vector3 LambertRefl::sample_dir(const Vector3 &norm, const Vector3 &outdir) const
nuclear@2	17 {
nuclear@2	18 Vector3 dir = Vector3{randf(-1, 1), randf(-1, 1), randf(-1, 1)}.normalized();
nuclear@2	19 return dot_product(dir, norm) < 0.0 ? -dir : dir;
nuclear@2	20 }
nuclear@2	21
nuclear@2	22 float LambertRefl::eval(const Vector3 &norm, const Vector3 &outdir, const Vector3 &indir) const
nuclear@2	23 {
nuclear@2	24 return dot_product(norm, outdir);
nuclear@2	25 }