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/*
* 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"
/* IES Light */
shader node_ies_light(int use_mapping = 0,
matrix mapping = matrix(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0),
string filename = "",
float Strength = 1.0,
point Vector = I,
output float Fac = 0.0)
{
point p = Vector;
if (use_mapping) {
p = transform(mapping, p);
}
p = normalize((vector)p);
float v_angle = acos(-p[2]);
float h_angle = atan2(p[0], p[1]) + M_PI;
Fac = Strength * texture(filename, h_angle, v_angle);
}
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