print names of nodes/sockets when cycles complains about only being able to connect a closure to another closure.

1 files changed, 4 insertions, 1 deletions

diff --git a/intern/cycles/render/graph.cpp b/intern/cycles/render/graph.cpp
index 34c8879aa1f..18e802b610d 100644
--- a/intern/cycles/render/graph.cpp
+++ b/intern/cycles/render/graph.cpp
@@ -187,7 +187,10 @@ void ShaderGraph::connect(ShaderOutput *from, ShaderInput *to)
 	if(from->type != to->type) {
 		/* for closures we can't do automatic conversion */
 		if(from->type == SHADER_SOCKET_CLOSURE || to->type == SHADER_SOCKET_CLOSURE) {
-			fprintf(stderr, "ShaderGraph connect: can only connect closure to closure.\n");
+			fprintf(stderr, "ShaderGraph connect: can only connect closure to closure "
+			        "(ShaderNode:%s, ShaderOutput:%s , type:%d -> to ShaderNode:%s, ShaderInput:%s, type:%d).\n",
+			        from->parent->name.c_str(), from->name, (int)from->type,
+			        to->parent->name.c_str(),   to->name,   (int)to->type);
 			return;
 		}