- another fresnel improvement. :)

  At last irc meeting, eeshlo pointed to an error in the code. It didn't
  use the IOR value correctly. This has been solved. So how it works now:
  - the IOR button value influences (very subtle) the fresnel effect.
    Only for realism diehards.
  - the Fresnel value (slider) now denotes the power in the function
    rf + (1-rf) * (1-c)^5
    where rf= rf = ((ior-1)/(ior+1))^2
    and c the dot-product ray/normal.
  - so, set the slider at '5' and you have real fresnel. Lower values
    for interesting artistic effects.

- put back the forgotten code for gaussian corrected sampling during
  antialising render. Normally, each sub-pixel sample in Blender counts
  equally, and together make up the pixel color.
  With 'Gauss' option set (F10 menu) each sub-pixel sample creates a small
  weighted mask with variable size, which (can) affect neighbouring pixels
  as well. The result is smoother edges, less sensitive for gamma, and
  well suited to reduce motion-aliasing (when things move extreme slow).
  This is result of *long* period of research in NeoGeo days, and based on
  every scientific sampling/reconstructing theory we could find. Plus a
  little bit of our selves. :)

- I should write once how blender constructs Jitter tables for sub-sampling.
  this is a very nice method, and superior to normal block filter or random
  jittering... time!

1 files changed, 1 insertions, 1 deletions

diff --git a/source/blender/render/intern/include/rendercore.h b/source/blender/render/intern/include/rendercore.h
index c463d9cdaae..c8ad75a4f00 100644
--- a/source/blender/render/intern/include/rendercore.h
+++ b/source/blender/render/intern/include/rendercore.h
@@ -58,7 +58,7 @@ void shade_input_set_coords(ShadeInput *shi, float u, float v, int i1, int i2, i
 void shade_color(struct ShadeInput *shi, ShadeResult *shr);
 void shade_lamp_loop(struct ShadeInput *shi, ShadeResult *shr, int mask);
 
-float fresnel_fac(float *view, float *vn, float fresnel);
+float fresnel_fac(float *view, float *vn, float fresnel, float fac);
 void calc_R_ref(struct ShadeInput *shi);
 float spec(float inp, int hard);