1 files changed, 42 insertions, 0 deletions
diff --git a/intern/cycles/kernel/osl/shaders/node_light_falloff.osl b/intern/cycles/kernel/osl/shaders/node_light_falloff.osl
new file mode 100644
index 00000000000..3f3c9444a5a
--- /dev/null
+++ b/intern/cycles/kernel/osl/shaders/node_light_falloff.osl
@@ -0,0 +1,42 @@
+/*
+ * Copyright 2011-2013 Blender Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "stdcycles.h"
+
+shader node_light_falloff(float Strength = 0.0,
+                          float Smooth = 0.0,
+                          output float Quadratic = 0.0,
+                          output float Linear = 0.0,
+                          output float Constant = 0.0)
+{
+  float ray_length = 0.0;
+  float strength = Strength;
+  getattribute("path:ray_length", ray_length);
+
+  if (Smooth > 0.0) {
+    float squared = ray_length * ray_length;
+    strength *= squared / (Smooth + squared);
+  }
+
+  /* Quadratic */
+  Quadratic = strength;
+
+  /* Linear */
+  Linear = (strength * ray_length);
+
+  /* Constant */
+  Constant = (strength * ray_length * ray_length);
+}