forked from bartvdbraak/blender
Brecht Van Lommel
eff3bd4e98
The same can be achieved by flipping normals on the mesh, but it can be convenient to do this in the shader.
31 lines
879 B
Plaintext
31 lines
879 B
Plaintext
/*
|
|
* 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"
|
|
#include "node_fresnel.h"
|
|
|
|
shader node_fresnel(
|
|
float IOR = 1.45,
|
|
normal Normal = N,
|
|
output float Fac = 0.0)
|
|
{
|
|
float f = max(IOR, 1e-5);
|
|
float eta = backfacing() ? 1.0 / f: f;
|
|
float cosi = dot(I, Normal);
|
|
Fac = fresnel_dielectric_cos(cosi, eta);
|
|
}
|
|
|