diff options
Diffstat (limited to 'intern/cycles/kernel/osl/nodes/node_bump.osl')
-rw-r--r-- | intern/cycles/kernel/osl/nodes/node_bump.osl | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/intern/cycles/kernel/osl/nodes/node_bump.osl b/intern/cycles/kernel/osl/nodes/node_bump.osl new file mode 100644 index 00000000000..a3849e70f98 --- /dev/null +++ b/intern/cycles/kernel/osl/nodes/node_bump.osl @@ -0,0 +1,46 @@ +/* + * 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" + +/* "Bump Mapping Unparametrized Surfaces on the GPU" + * Morten S. Mikkelsen, 2010 */ + +surface node_bump( + float SampleCenter = 0.0, + float SampleX = 0.0, + float SampleY = 0.0, + output normal Normal = N) +{ + float dx = SampleX - SampleCenter; + float dy = SampleY - SampleCenter; + + vector dPdx = Dx(P); + vector dPdy = Dy(P); + + vector Rx = cross(dPdy, N); + vector Ry = cross(N, dPdx); + + float det = dot(dPdx, Rx); + vector surfgrad = dx*Rx + dy*Ry; + + surfgrad *= 0.1; /* todo: remove this factor */ + + Normal = normalize(abs(det)*N - sign(det)*surfgrad); +} + |