Updated color calculus for sunsky

- removed ugly clamping function (it was dividing XYZ based on max of
  one of the values)
- added option to use Exposure, this only works for brightness (Y).
  results look very pleasant, foggy and hazy results are possible.
  with exposre==0, no exposure happens for HDR extreme range skies,
  this is how yafray rendered it.
- added menu for choosing color spaces (CIE = modern lcds)

Please review! (and yes i know it's still not in World :)

1 files changed, 3 insertions, 1 deletions

diff --git a/source/blender/makesdna/DNA_lamp_types.h b/source/blender/makesdna/DNA_lamp_types.h
index 217e3ed1463..f8f2255c1a7 100644
--- a/source/blender/makesdna/DNA_lamp_types.h
+++ b/source/blender/makesdna/DNA_lamp_types.h
@@ -91,7 +91,9 @@ typedef struct Lamp {
     float atm_extinction_factor;
     float atm_distance_factor;
 	float skyblendfac;
-
+	float sky_exposure;
+	short sky_colorspace, pad4;
+	
 	/* yafray: photonlight params */
 	int YF_numphotons, YF_numsearch;
 	short YF_phdepth, YF_useqmc, YF_bufsize, YF_pad;