Fi T51023: MixRGB constant folding not effective with clamp option.

1 files changed, 9 insertions, 2 deletions

diff --git a/intern/cycles/render/constant_fold.cpp b/intern/cycles/render/constant_fold.cpp
index 2569d9eec27..9db875ea4f1 100644
--- a/intern/cycles/render/constant_fold.cpp
+++ b/intern/cycles/render/constant_fold.cpp
@@ -160,8 +160,15 @@ bool ConstantFolder::try_bypass_or_make_constant(ShaderInput *input, bool clamp)
 		bypass(input->link);
 		return true;
 	}
-
-	return false;
+	else {
+		/* disconnect other inputs if we can't fully bypass due to clamp */
+		foreach(ShaderInput *other, node->inputs) {
+			if(other != input && other->link) {
+				graph->disconnect(other);
+			}
+		}
+		return false;
+	}
 }
 
 bool ConstantFolder::is_zero(ShaderInput *input) const