blender/intern/cycles/kernel/shaders/node_blackbody.osl

/*
 * 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 "stdosl.h"

shader node_blackbody(float Temperature = 1200.0, output color Color = 0.0)
{
  color rgb = blackbody(Temperature);

  /* Scale by luminance */
  float l = luminance(rgb);
  if (l != 0.0)
    rgb /= l;
  Color = rgb;
}