- 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, 8 insertions, 2 deletions

diff --git a/source/blender/blenloader/intern/readfile.c b/source/blender/blenloader/intern/readfile.c
index 068fca17726..f55d0fa78f7 100644
--- a/source/blender/blenloader/intern/readfile.c
+++ b/source/blender/blenloader/intern/readfile.c
@@ -3931,13 +3931,14 @@ static void do_versions(Main *main)
 	}	
 	if(main->versionfile <= 231) {	
 		Material *ma= main->mat.first;
+		Scene *sce;
 		while(ma) {
 			if(ma->ang==0.0) {
 				ma->ang= 1.0;
 				ma->ray_depth= 2;
 				ma->ray_depth_tra= 2;
-				ma->fresnel_tra= 1.0;
-				ma->fresnel_mir= 1.0;
+				ma->fresnel_tra= 0.0;
+				ma->fresnel_mir= 0.0;
 			}
 			else if(ma->ang<1.0) {		// temporal, because of IOR & fresnel change
 				ma-> ang= 1.0/ma->ang;
@@ -3946,6 +3947,11 @@ static void do_versions(Main *main)
 			}
 			ma= ma->id.next;
 		}
+		sce= main->scene.first;
+		while(sce) {
+			if(sce->r.gauss==0.0) sce->r.gauss= 1.0;
+			sce= sce->id.next;
+		}
 	}
 	/* don't forget to set version number in blender.c! */
 }