- Fresnel V4.0

Based on feedback (thnx phase!) I found a big disadvantage of the 'real'
fresnel formula. It doesnt degrade to 0.0, causing 2-3 times too many
rays being fired compared to the previous one. So; a lot slower.

Now committed is a hybrid which allows (close to) real, and nice artistic
freedom, *and* it really goes to 0.0 and 1.0, assisting nicely in optimal
render times.
A real doc how it works (with pics) will be made before real release.

- Fixed bug in raytrace: the first renderpass didn't use fresnel for mirror.
- Fixed bug in previewrender, now it closer matches how fresnel renders

1 files changed, 2 insertions, 2 deletions

diff --git a/source/blender/makesdna/DNA_material_types.h b/source/blender/makesdna/DNA_material_types.h
index d75cce4e4b8..f81f79f2b25 100644
--- a/source/blender/makesdna/DNA_material_types.h
+++ b/source/blender/makesdna/DNA_material_types.h
@@ -57,8 +57,8 @@ typedef struct Material {
 	float amb, emit, ang, spectra, ray_mirror;
 	float alpha, ref, spec, zoffs, add;
 	float translucency;
-	float fresnel_mir;
-	float fresnel_tra;
+	float fresnel_mir, fresnel_mir_i;
+	float fresnel_tra, fresnel_tra_i;
 	short ray_depth, ray_depth_tra;
 	short har;
 	char seed1, seed2;