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

/*
 * Copyright 2011-2015 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_voxel_texture(string filename = "",
                          string interpolation = "linear",
                          int use_mapping = 0,
                          matrix mapping = matrix(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0),
                          point Vector = P,
                          output float Density = 0,
                          output color Color = 0)
{
  point p = Vector;
  if (use_mapping) {
    p = transform(mapping, p);
  }
  else {
    p = transform("object", Vector);
    matrix tfm;
    if (getattribute("geom:generated_transform", tfm))
      p = transform(tfm, p);
  }
  if (p[0] < 0.0 || p[1] < 0.0 || p[2] < 0.0 || p[0] > 1.0 || p[1] > 1.0 || p[2] > 1.0) {
    Density = 0;
    Color = color(0, 0, 0);
  }
  else {
    Color = (color)texture3d(
        filename, p, "wrap", "periodic", "interp", interpolation, "alpha", Density);
  }
}