Commit: 578cc2143d36d1d4ab3ef9583a5b207034b01f89
Author: Sergey Sharybin
Date: Sat Feb 21 17:31:41 2015 +0500
Branches: master
https://developer.blender.org/rB578cc2143d36d1d4ab3ef9583a5b207034b01f89
Cycles: Add note about autodiff in OSL wireframe shader
===================================================================
M intern/cycles/kernel/shaders/node_wireframe.osl
===================================================================
diff --git a/intern/cycles/kernel/shaders/node_wireframe.osl
b/intern/cycles/kernel/shaders/node_wireframe.osl
index 1ab0a65..5cc2144 100644
--- a/intern/cycles/kernel/shaders/node_wireframe.osl
+++ b/intern/cycles/kernel/shaders/node_wireframe.osl
@@ -24,6 +24,10 @@ shader node_wireframe(
output float Fac = 0.0)
{
Fac = wireframe("triangles", Size, use_pixel_size);
+ /* TODO(sergey): Since we can't use autodiff here we do algebraic
+ * calculation of derivatives by definition. We could probably
+ * optimize this a bit by doing some extra calculation in wireframe().
+ */
if (bump_offset == "dx") {
point dx = Dx(P);
P -= dx;
@@ -35,4 +39,3 @@ shader node_wireframe(
Fac += (Fac - wireframe("triangles", Size, use_pixel_size)) /
length(dy);
}
}
-
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