blender/intern/cycles/kernel/shaders/node_refraction_bsdf.osl
Brecht Van Lommel eff3bd4e98 Fix T38439: allow IOR in range [0, inf] instead of [1, inf] in Cycles.
The same can be achieved by flipping normals on the mesh, but it can be
convenient to do this in the shader.
2014-02-03 17:08:34 +01:00

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/*
* 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_refraction_bsdf(
color Color = 0.8,
string distribution = "Sharp",
float Roughness = 0.2,
float IOR = 1.45,
normal Normal = N,
output closure color BSDF = 0)
{
float f = max(IOR, 1e-5);
float eta = backfacing() ? 1.0 / f: f;
if (distribution == "Sharp")
BSDF = Color * refraction(Normal, eta);
else if (distribution == "Beckmann")
BSDF = Color * microfacet_beckmann_refraction(Normal, Roughness, eta);
else if (distribution == "GGX")
BSDF = Color * microfacet_ggx_refraction(Normal, Roughness, eta);
}