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blender/intern/cycles/kernel/svm/svm_displace.h

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Cycles render engine, initial commit. This is the engine itself, blender modifications and build instructions will follow later. Cycles uses code from some great open source projects, many thanks them: * BVH building and traversal code from NVidia's "Understanding the Efficiency of Ray Traversal on GPUs": http://code.google.com/p/understanding-the-efficiency-of-ray-traversal-on-gpus/ * Open Shading Language for a large part of the shading system: http://code.google.com/p/openshadinglanguage/ * Blender for procedural textures and a few other nodes. * Approximate Catmull Clark subdivision from NVidia Mesh tools: http://code.google.com/p/nvidia-mesh-tools/ * Sobol direction vectors from: http://web.maths.unsw.edu.au/~fkuo/sobol/ * Film response functions from: http://www.cs.columbia.edu/CAVE/software/softlib/dorf.php
2011-04-27 11:58:34 +00:00
/*
* 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.
*/
CCL_NAMESPACE_BEGIN
/* Bump Node */
Cycles: per-BSDF normal input and new Bump node. Each BSDF node now has a Normal input, which can be used to set a custom normal for the BSDF, for example if you want to have only bump on one of the layers in a multilayer material. The Bump node can be used to generate a normal from a scalar value, the same as what happens when you connect a scalar value to the displacement output. Documentation has been updated with the latest changes: http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Nodes Patch by Agustin Benavidez, some implementation tweaks by me.
2012-10-10 15:56:43 +00:00
__device void svm_node_set_bump(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node)
Cycles render engine, initial commit. This is the engine itself, blender modifications and build instructions will follow later. Cycles uses code from some great open source projects, many thanks them: * BVH building and traversal code from NVidia's "Understanding the Efficiency of Ray Traversal on GPUs": http://code.google.com/p/understanding-the-efficiency-of-ray-traversal-on-gpus/ * Open Shading Language for a large part of the shading system: http://code.google.com/p/openshadinglanguage/ * Blender for procedural textures and a few other nodes. * Approximate Catmull Clark subdivision from NVidia Mesh tools: http://code.google.com/p/nvidia-mesh-tools/ * Sobol direction vectors from: http://web.maths.unsw.edu.au/~fkuo/sobol/ * Film response functions from: http://www.cs.columbia.edu/CAVE/software/softlib/dorf.php
2011-04-27 11:58:34 +00:00
{
#ifdef __RAY_DIFFERENTIALS__
Cycles: per-BSDF normal input and new Bump node. Each BSDF node now has a Normal input, which can be used to set a custom normal for the BSDF, for example if you want to have only bump on one of the layers in a multilayer material. The Bump node can be used to generate a normal from a scalar value, the same as what happens when you connect a scalar value to the displacement output. Documentation has been updated with the latest changes: http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Nodes Patch by Agustin Benavidez, some implementation tweaks by me.
2012-10-10 15:56:43 +00:00
/* get normal input */
Cycles: bump node changes to add a Distance input that controls the overall displacement distance, and an Invert option to invert the bump effect.
2013-05-10 16:57:17 +00:00
uint normal_offset, distance_offset, invert;
decode_node_uchar4(node.y, &normal_offset, &distance_offset, &invert, NULL);
float3 normal_in = stack_valid(normal_offset)? stack_load_float3(stack, normal_offset): sd->N;
Cycles: per-BSDF normal input and new Bump node. Each BSDF node now has a Normal input, which can be used to set a custom normal for the BSDF, for example if you want to have only bump on one of the layers in a multilayer material. The Bump node can be used to generate a normal from a scalar value, the same as what happens when you connect a scalar value to the displacement output. Documentation has been updated with the latest changes: http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Nodes Patch by Agustin Benavidez, some implementation tweaks by me.
2012-10-10 15:56:43 +00:00
/* get surface tangents from normal */
float3 Rx = cross(sd->dP.dy, normal_in);
float3 Ry = cross(normal_in, sd->dP.dx);
/* get bump values */
Cycles bump node: change the Strength value to work better, previously it would give results that were either too weak or too strong, this makes it give more predictable results. The downside is that it breaks backwards compatibility but the previous behavior was almost broken.
2013-05-09 14:05:37 +00:00
uint c_offset, x_offset, y_offset, strength_offset;
decode_node_uchar4(node.z, &c_offset, &x_offset, &y_offset, &strength_offset);
Cycles: per-BSDF normal input and new Bump node. Each BSDF node now has a Normal input, which can be used to set a custom normal for the BSDF, for example if you want to have only bump on one of the layers in a multilayer material. The Bump node can be used to generate a normal from a scalar value, the same as what happens when you connect a scalar value to the displacement output. Documentation has been updated with the latest changes: http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Nodes Patch by Agustin Benavidez, some implementation tweaks by me.
2012-10-10 15:56:43 +00:00
Cycles render engine, initial commit. This is the engine itself, blender modifications and build instructions will follow later. Cycles uses code from some great open source projects, many thanks them: * BVH building and traversal code from NVidia's "Understanding the Efficiency of Ray Traversal on GPUs": http://code.google.com/p/understanding-the-efficiency-of-ray-traversal-on-gpus/ * Open Shading Language for a large part of the shading system: http://code.google.com/p/openshadinglanguage/ * Blender for procedural textures and a few other nodes. * Approximate Catmull Clark subdivision from NVidia Mesh tools: http://code.google.com/p/nvidia-mesh-tools/ * Sobol direction vectors from: http://web.maths.unsw.edu.au/~fkuo/sobol/ * Film response functions from: http://www.cs.columbia.edu/CAVE/software/softlib/dorf.php
2011-04-27 11:58:34 +00:00
float h_c = stack_load_float(stack, c_offset);
float h_x = stack_load_float(stack, x_offset);
float h_y = stack_load_float(stack, y_offset);
Cycles: per-BSDF normal input and new Bump node. Each BSDF node now has a Normal input, which can be used to set a custom normal for the BSDF, for example if you want to have only bump on one of the layers in a multilayer material. The Bump node can be used to generate a normal from a scalar value, the same as what happens when you connect a scalar value to the displacement output. Documentation has been updated with the latest changes: http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Nodes Patch by Agustin Benavidez, some implementation tweaks by me.
2012-10-10 15:56:43 +00:00
/* compute surface gradient and determinant */
Cycles render engine, initial commit. This is the engine itself, blender modifications and build instructions will follow later. Cycles uses code from some great open source projects, many thanks them: * BVH building and traversal code from NVidia's "Understanding the Efficiency of Ray Traversal on GPUs": http://code.google.com/p/understanding-the-efficiency-of-ray-traversal-on-gpus/ * Open Shading Language for a large part of the shading system: http://code.google.com/p/openshadinglanguage/ * Blender for procedural textures and a few other nodes. * Approximate Catmull Clark subdivision from NVidia Mesh tools: http://code.google.com/p/nvidia-mesh-tools/ * Sobol direction vectors from: http://web.maths.unsw.edu.au/~fkuo/sobol/ * Film response functions from: http://www.cs.columbia.edu/CAVE/software/softlib/dorf.php
2011-04-27 11:58:34 +00:00
float det = dot(sd->dP.dx, Rx);
float3 surfgrad = (h_x - h_c)*Rx + (h_y - h_c)*Ry;
Cycles: some steps to getting OpenCL backend to compile.
2011-05-20 12:26:01 +00:00
float absdet = fabsf(det);
Cycles: per-BSDF normal input and new Bump node. Each BSDF node now has a Normal input, which can be used to set a custom normal for the BSDF, for example if you want to have only bump on one of the layers in a multilayer material. The Bump node can be used to generate a normal from a scalar value, the same as what happens when you connect a scalar value to the displacement output. Documentation has been updated with the latest changes: http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Nodes Patch by Agustin Benavidez, some implementation tweaks by me.
2012-10-10 15:56:43 +00:00
Cycles bump node: change the Strength value to work better, previously it would give results that were either too weak or too strong, this makes it give more predictable results. The downside is that it breaks backwards compatibility but the previous behavior was almost broken.
2013-05-09 14:05:37 +00:00
float strength = stack_load_float(stack, strength_offset);
Cycles: bump node changes to add a Distance input that controls the overall displacement distance, and an Invert option to invert the bump effect.
2013-05-10 16:57:17 +00:00
float distance = stack_load_float(stack, distance_offset);
if(invert)
distance *= -1.0f;
strength = max(strength, 0.0f);
Cycles bump node: change the Strength value to work better, previously it would give results that were either too weak or too strong, this makes it give more predictable results. The downside is that it breaks backwards compatibility but the previous behavior was almost broken.
2013-05-09 14:05:37 +00:00
Cycles: per-BSDF normal input and new Bump node. Each BSDF node now has a Normal input, which can be used to set a custom normal for the BSDF, for example if you want to have only bump on one of the layers in a multilayer material. The Bump node can be used to generate a normal from a scalar value, the same as what happens when you connect a scalar value to the displacement output. Documentation has been updated with the latest changes: http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Nodes Patch by Agustin Benavidez, some implementation tweaks by me.
2012-10-10 15:56:43 +00:00
/* compute and output perturbed normal */
Cycles: bump node changes to add a Distance input that controls the overall displacement distance, and an Invert option to invert the bump effect.
2013-05-10 16:57:17 +00:00
float3 normal_out = normalize(absdet*normal_in - distance*signf(det)*surfgrad);
Cycles bump node: change the Strength value to work better, previously it would give results that were either too weak or too strong, this makes it give more predictable results. The downside is that it breaks backwards compatibility but the previous behavior was almost broken.
2013-05-09 14:05:37 +00:00
normal_out = normalize(strength*normal_out + (1.0f - strength)*normal_in);
stack_store_float3(stack, node.w, normal_out);
Cycles render engine, initial commit. This is the engine itself, blender modifications and build instructions will follow later. Cycles uses code from some great open source projects, many thanks them: * BVH building and traversal code from NVidia's "Understanding the Efficiency of Ray Traversal on GPUs": http://code.google.com/p/understanding-the-efficiency-of-ray-traversal-on-gpus/ * Open Shading Language for a large part of the shading system: http://code.google.com/p/openshadinglanguage/ * Blender for procedural textures and a few other nodes. * Approximate Catmull Clark subdivision from NVidia Mesh tools: http://code.google.com/p/nvidia-mesh-tools/ * Sobol direction vectors from: http://web.maths.unsw.edu.au/~fkuo/sobol/ * Film response functions from: http://www.cs.columbia.edu/CAVE/software/softlib/dorf.php
2011-04-27 11:58:34 +00:00
#endif
}
/* Displacement Node */
__device void svm_node_set_displacement(ShaderData *sd, float *stack, uint fac_offset)
{
float d = stack_load_float(stack, fac_offset);
sd->P += sd->N*d*0.1f; /* todo: get rid of this factor */
}
CCL_NAMESPACE_END
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