1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
|
/*
* 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;
float roughness = Roughness * Roughness;
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);
}
|