diff options
Diffstat (limited to 'intern/cycles/kernel/shaders/node_tangent.osl')
| -rw-r--r-- | intern/cycles/kernel/shaders/node_tangent.osl | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/intern/cycles/kernel/shaders/node_tangent.osl b/intern/cycles/kernel/shaders/node_tangent.osl new file mode 100644 index 00000000000..731af89231a --- /dev/null +++ b/intern/cycles/kernel/shaders/node_tangent.osl @@ -0,0 +1,50 @@ +/* + * 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_tangent( + normal NormalIn = N, + string attr_name = "geom:tangent", + string direction_type = "Radial", + string axis = "Z", + output normal Tangent = normalize(dPdu)) +{ + vector T; + + if (direction_type == "UV Map") { + getattribute(attr_name, T); + } + else if (direction_type == "Radial") { + point generated; + + if (!getattribute("geom:generated", generated)) + generated = P; + + if (axis == "X") + T = vector(0.0, -(generated[2] - 0.5), (generated[1] - 0.5)); + else if (axis == "Y") + T = vector(-(generated[2] - 0.5), 0.0, (generated[0] - 0.5)); + else + T = vector(-(generated[1] - 0.5), (generated[0] - 0.5), 0.0); + } + + T = transform("object", "world", T); + Tangent = cross(NormalIn, normalize(cross(T, NormalIn))); +} + |