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/blenkernel/intern/object.c b/source/blender/blenkernel/intern/object.c
index 2dfa849fc43..ec110c6ea7c 100644
--- a/source/blender/blenkernel/intern/object.c
+++ b/source/blender/blenkernel/intern/object.c
@@ -758,7 +758,9 @@ void *add_lamp(char *name)
 	la->sun_intensity = 1.0;
 	la->skyblendtype= MA_RAMP_ADD;
 	la->skyblendfac= 1.0f;
-
+	la->sky_colorspace= BLI_CS_CIE;
+	la->sky_exposure= 1.0f;
+	
 	curvemapping_initialize(la->curfalloff);
 	return la;
 }