The material index did not work when FSAA was turned on.

The information was written in the temp exr files, but was not read back.
After checking I saw that the pass was not merged back in the rendercore.

After adding this it worked. tested with all FSAA settings.

1 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/render/intern/source/rendercore.c b/source/blender/render/intern/source/rendercore.c
index 2fa6bed5aae..3aca334cffe 100644
--- a/source/blender/render/intern/source/rendercore.c
+++ b/source/blender/render/intern/source/rendercore.c
@@ -627,6 +627,12 @@ static void add_passes(RenderLayer *rl, int offset, ShadeInput *shi, ShadeResult
 					*fp= (float)shi->obr->ob->index;
 				}
 				break;
+			case SCE_PASS_INDEXMA:
+				if(shi->vlr) {
+					fp= rpass->rect + offset;
+					*fp= (float)shi->mat->index;
+				}
+				break;
 			case SCE_PASS_MIST:
 				fp= rpass->rect + offset;
 				*fp= shr->mist;