diff options
Diffstat (limited to 'intern/cycles/kernel/osl/nodes/node_layer_weight.osl')
| -rw-r--r-- | intern/cycles/kernel/osl/nodes/node_layer_weight.osl | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/intern/cycles/kernel/osl/nodes/node_layer_weight.osl b/intern/cycles/kernel/osl/nodes/node_layer_weight.osl new file mode 100644 index 00000000000..ea25d0c0e02 --- /dev/null +++ b/intern/cycles/kernel/osl/nodes/node_layer_weight.osl @@ -0,0 +1,47 @@ +/* + * 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" +#include "node_fresnel.h" + +shader node_layer_weight( + float Blend = 0.5, + normal Normal = N, + output float Fresnel = 0.0, + output float Facing = 0.0) +{ + float blend = Blend; + + /* Fresnel */ + float eta = max(1.0 - Blend, 1e-5); + eta = backfacing()? eta: 1.0 / eta; + Fresnel = fresnel_dielectric(I, Normal, eta); + + /* Facing */ + Facing = abs(dot(I, Normal)); + + if (blend != 0.5) { + blend = clamp(blend, 0.0, 1.0); + blend = (blend < 0.5)? 2.0 * blend: 0.5 / (1.0 - blend); + + Facing = pow(Facing, blend); + } + + Facing = 1.0 - Facing; +} + |