Fix #20830: only rendering Z pass did not give correct Z values.

2 files changed, 9 insertions, 0 deletions

diff --git a/source/blender/render/intern/source/shadeinput.c b/source/blender/render/intern/source/shadeinput.c
index 38241878300..d1fa8a5ed51 100644
--- a/source/blender/render/intern/source/shadeinput.c
+++ b/source/blender/render/intern/source/shadeinput.c
@@ -1416,6 +1416,10 @@ int shade_samples(ShadeSample *ssamp, PixStr *ps, int x, int y)
 				shade_input_do_shade(shi, shr);
 			}
 		}
+		else if(shi->passflag & SCE_PASS_Z) {
+			for(samp=0; samp<ssamp->tot; samp++, shi++, shr++)
+				shr->z= -shi->co[2];
+		}
 		
 		return 1;
 	}
diff --git a/source/blender/render/intern/source/zbuf.c b/source/blender/render/intern/source/zbuf.c
index 484dbdd37a3..6d67c068bdd 100644
--- a/source/blender/render/intern/source/zbuf.c
+++ b/source/blender/render/intern/source/zbuf.c
@@ -3828,6 +3828,11 @@ static int shade_tra_samples(ShadeSample *ssamp, StrandShadeCache *cache, int x,
 						renderspothalo(shi, shr->combined, shr->combined[3]);
 			}
 		}
+		else if(shi->passflag & SCE_PASS_Z) {
+			for(samp=0; samp<ssamp->tot; samp++, shi++, shr++)
+				shr->z= -shi->co[2];
+		}
+
 		return 1;
 	}
 	return 0;