Cycles / Blackbody node:

* First step towards a Blackbody to RGB converter. You can specify a color in Kelvin inside the node.
* Only implemented for OSL atm, SVM will follow.

intern/cycles/kernel/shaders/CMakeLists.txt

@@ -68,6 +68,7 @@ set(SRC_OSL
 	node_voronoi_texture.osl
 	node_ward_bsdf.osl
 	node_wavelength.osl
+	node_blackbody.osl
 	node_wave_texture.osl
 	node_wireframe.osl
 )

intern/cycles/kernel/shaders/node_blackbody.osl

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2013, Blender Foundation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include "stdosl.h"
+
+shader node_blackbody(
+	float Temperature = 1200.0,
+	output color Color = 0.0)
+{
+	Color = blackbody(Temperature);
+}
+