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
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
/*
* Copyright 2011, Blender Foundation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "stdosl.h"
shader node_ward_bsdf(
color Color = color(0.8, 0.8, 0.8),
float Roughness = 0.0,
float Anisotropy = 0.0,
float Rotation = 0.0,
normal Normal = N,
normal Tangent = normalize(dPdu),
output closure color BSDF = diffuse(Normal))
{
/* rotate tangent around normal */
vector T = Tangent;
if (Rotation != 0.0)
T = rotate(T, Rotation*2.0*M_PI, point(0.0, 0.0, 0.0), Normal);
/* compute roughness */
float RoughnessU, RoughnessV;
float aniso = clamp(Anisotropy, -0.99, 0.99);
if (aniso < 0.0) {
RoughnessU = Roughness / (1.0 + aniso);
RoughnessV = Roughness * (1.0 + aniso);
}
else {
RoughnessU = Roughness * (1.0 - aniso);
RoughnessV = Roughness / (1.0 - aniso);
}
BSDF = Color * ward(Normal, T, RoughnessU, RoughnessV);
}
|