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blender/intern/cycles/kernel/kernel_shadow.h

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Code cleanup: move shadow_blocked function into separate file.
2013-12-28 01:56:53 +00:00
/*
* Copyright 2011-2013 Blender Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License
*/
CCL_NAMESPACE_BEGIN
ccl_device_inline bool shadow_blocked(KernelGlobals *kg, PathState *state, Ray *ray, float3 *shadow)
{
*shadow = make_float3(1.0f, 1.0f, 1.0f);
if(ray->t == 0.0f)
return false;
Cycles Volume Render: support for rendering of homogeneous volume with absorption. This is the simplest possible volume rendering case, constant density inside the volume and no scattering or emission. My plan is to tweak, verify and commit more volume rendering effects one by one, doing it all at once makes it difficult to verify correctness and track down bugs. Documentation is here: http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Materials/Volume Currently this hooks into path tracing in 3 ways, which should get us pretty far until we add more advanced light sampling. These 3 hooks are repeated in the path tracing, branched path tracing and transparent shadow code: * Determine active volume shader at start of the path * Change active volume shader on transmission through a surface * Light attenuation over line segments between camera, surfaces and background This is work by "storm", Stuart Broadfoot, Thomas Dinges and myself.
2013-12-28 15:56:19 +00:00
Code cleanup: move shadow_blocked function into separate file.
2013-12-28 01:56:53 +00:00
Intersection isect;
#ifdef __HAIR__
bool result = scene_intersect(kg, ray, PATH_RAY_SHADOW_OPAQUE, &isect, NULL, 0.0f, 0.0f);
#else
bool result = scene_intersect(kg, ray, PATH_RAY_SHADOW_OPAQUE, &isect);
#endif
#ifdef __TRANSPARENT_SHADOWS__
if(result && kernel_data.integrator.transparent_shadows) {
/* transparent shadows work in such a way to try to minimize overhead
* in cases where we don't need them. after a regular shadow ray is
* cast we check if the hit primitive was potentially transparent, and
* only in that case start marching. this gives on extra ray cast for
* the cases were we do want transparency.
*
* also note that for this to work correct, multi close sampling must
* be used, since we don't pass a random number to shader_eval_surface */
if(shader_transparent_shadow(kg, &isect)) {
float3 throughput = make_float3(1.0f, 1.0f, 1.0f);
float3 Pend = ray->P + ray->D*ray->t;
int bounce = state->transparent_bounce;
Cycles Volume Render: support for rendering of homogeneous volume with absorption. This is the simplest possible volume rendering case, constant density inside the volume and no scattering or emission. My plan is to tweak, verify and commit more volume rendering effects one by one, doing it all at once makes it difficult to verify correctness and track down bugs. Documentation is here: http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Materials/Volume Currently this hooks into path tracing in 3 ways, which should get us pretty far until we add more advanced light sampling. These 3 hooks are repeated in the path tracing, branched path tracing and transparent shadow code: * Determine active volume shader at start of the path * Change active volume shader on transmission through a surface * Light attenuation over line segments between camera, surfaces and background This is work by "storm", Stuart Broadfoot, Thomas Dinges and myself.
2013-12-28 15:56:19 +00:00
#ifdef __VOLUME__
Cycles Volume Render: add support for overlapping volume objects. This works pretty much as you would expect, overlapping volume objects gives a more dense volume. What did change is that world volume shaders are now active everywhere, they are no longer excluded inside objects. This may not be desirable and we need to think of better control over this. In some cases you clearly want it to happen, for example if you are rendering a fire in a foggy environment. In other cases like the inside of a house you may not want any fog, but it doesn't seem possible in general for the renderer to automatically determine what is inside or outside of the house. This is implemented using a simple fixed size array of shader/object ID pairs, limited to max 15 overlapping objects. The closures from all shaders are put into a single closure array, exactly the same as if an add shader was used to combine them.
2013-12-28 19:02:40 +00:00
PathState ps = *state;
Cycles Volume Render: support for rendering of homogeneous volume with absorption. This is the simplest possible volume rendering case, constant density inside the volume and no scattering or emission. My plan is to tweak, verify and commit more volume rendering effects one by one, doing it all at once makes it difficult to verify correctness and track down bugs. Documentation is here: http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Materials/Volume Currently this hooks into path tracing in 3 ways, which should get us pretty far until we add more advanced light sampling. These 3 hooks are repeated in the path tracing, branched path tracing and transparent shadow code: * Determine active volume shader at start of the path * Change active volume shader on transmission through a surface * Light attenuation over line segments between camera, surfaces and background This is work by "storm", Stuart Broadfoot, Thomas Dinges and myself.
2013-12-28 15:56:19 +00:00
#endif
Code cleanup: move shadow_blocked function into separate file.
2013-12-28 01:56:53 +00:00
for(;;) {
if(bounce >= kernel_data.integrator.transparent_max_bounce) {
return true;
}
else if(bounce >= kernel_data.integrator.transparent_min_bounce) {
/* todo: get random number somewhere for probabilistic terminate */
#if 0
float probability = average(throughput);
float terminate = 0.0f;
if(terminate >= probability)
return true;
throughput /= probability;
#endif
}
#ifdef __HAIR__
if(!scene_intersect(kg, ray, PATH_RAY_SHADOW_TRANSPARENT, &isect, NULL, 0.0f, 0.0f)) {
#else
if(!scene_intersect(kg, ray, PATH_RAY_SHADOW_TRANSPARENT, &isect)) {
#endif
Cycles Volume Render: support for rendering of homogeneous volume with absorption. This is the simplest possible volume rendering case, constant density inside the volume and no scattering or emission. My plan is to tweak, verify and commit more volume rendering effects one by one, doing it all at once makes it difficult to verify correctness and track down bugs. Documentation is here: http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Materials/Volume Currently this hooks into path tracing in 3 ways, which should get us pretty far until we add more advanced light sampling. These 3 hooks are repeated in the path tracing, branched path tracing and transparent shadow code: * Determine active volume shader at start of the path * Change active volume shader on transmission through a surface * Light attenuation over line segments between camera, surfaces and background This is work by "storm", Stuart Broadfoot, Thomas Dinges and myself.
2013-12-28 15:56:19 +00:00
#ifdef __VOLUME__
/* attenuation for last line segment towards light */
Cycles Volume Render: add support for overlapping volume objects. This works pretty much as you would expect, overlapping volume objects gives a more dense volume. What did change is that world volume shaders are now active everywhere, they are no longer excluded inside objects. This may not be desirable and we need to think of better control over this. In some cases you clearly want it to happen, for example if you are rendering a fire in a foggy environment. In other cases like the inside of a house you may not want any fog, but it doesn't seem possible in general for the renderer to automatically determine what is inside or outside of the house. This is implemented using a simple fixed size array of shader/object ID pairs, limited to max 15 overlapping objects. The closures from all shaders are put into a single closure array, exactly the same as if an add shader was used to combine them.
2013-12-28 19:02:40 +00:00
if(ps.volume_stack[0].shader != SHADER_NO_ID)
Cycles Volume Render: heterogeneous (textured) volumes support. Volumes can now have textured colors and density. There is a Volume Sampling panel in the Render properties with these settings: * Step size: distance between volume shader samples when rendering the volume. Lower values give more accurate and detailed results but also increased render time. * Max steps: maximum number of steps through the volume before giving up, to protect from extremely long render times with big objects or small step sizes. This is much more compute intensive than homogeneous volume, so when you are not using a texture you should enable the Homogeneous Volume option in the material or world for faster rendering. One important missing feature is that Generated texture coordinates are not yet working in volumes, and they are the default coordinates for nearly all texture nodes. So until that works you need to plug in object texture coordinates or a world space position. This is work by "storm", Stuart Broadfoot, Thomas Dinges and myself.
2013-12-29 21:19:38 +00:00
kernel_volume_shadow(kg, &ps, ray, &throughput);
Cycles Volume Render: support for rendering of homogeneous volume with absorption. This is the simplest possible volume rendering case, constant density inside the volume and no scattering or emission. My plan is to tweak, verify and commit more volume rendering effects one by one, doing it all at once makes it difficult to verify correctness and track down bugs. Documentation is here: http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Materials/Volume Currently this hooks into path tracing in 3 ways, which should get us pretty far until we add more advanced light sampling. These 3 hooks are repeated in the path tracing, branched path tracing and transparent shadow code: * Determine active volume shader at start of the path * Change active volume shader on transmission through a surface * Light attenuation over line segments between camera, surfaces and background This is work by "storm", Stuart Broadfoot, Thomas Dinges and myself.
2013-12-28 15:56:19 +00:00
#endif
Code cleanup: move shadow_blocked function into separate file.
2013-12-28 01:56:53 +00:00
*shadow *= throughput;
return false;
}
if(!shader_transparent_shadow(kg, &isect))
return true;
Cycles Volume Render: support for rendering of homogeneous volume with absorption. This is the simplest possible volume rendering case, constant density inside the volume and no scattering or emission. My plan is to tweak, verify and commit more volume rendering effects one by one, doing it all at once makes it difficult to verify correctness and track down bugs. Documentation is here: http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Materials/Volume Currently this hooks into path tracing in 3 ways, which should get us pretty far until we add more advanced light sampling. These 3 hooks are repeated in the path tracing, branched path tracing and transparent shadow code: * Determine active volume shader at start of the path * Change active volume shader on transmission through a surface * Light attenuation over line segments between camera, surfaces and background This is work by "storm", Stuart Broadfoot, Thomas Dinges and myself.
2013-12-28 15:56:19 +00:00
#ifdef __VOLUME__
/* attenuation between last surface and next surface */
Cycles Volume Render: add support for overlapping volume objects. This works pretty much as you would expect, overlapping volume objects gives a more dense volume. What did change is that world volume shaders are now active everywhere, they are no longer excluded inside objects. This may not be desirable and we need to think of better control over this. In some cases you clearly want it to happen, for example if you are rendering a fire in a foggy environment. In other cases like the inside of a house you may not want any fog, but it doesn't seem possible in general for the renderer to automatically determine what is inside or outside of the house. This is implemented using a simple fixed size array of shader/object ID pairs, limited to max 15 overlapping objects. The closures from all shaders are put into a single closure array, exactly the same as if an add shader was used to combine them.
2013-12-28 19:02:40 +00:00
if(ps.volume_stack[0].shader != SHADER_NO_ID) {
Cycles Volume Render: support for rendering of homogeneous volume with absorption. This is the simplest possible volume rendering case, constant density inside the volume and no scattering or emission. My plan is to tweak, verify and commit more volume rendering effects one by one, doing it all at once makes it difficult to verify correctness and track down bugs. Documentation is here: http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Materials/Volume Currently this hooks into path tracing in 3 ways, which should get us pretty far until we add more advanced light sampling. These 3 hooks are repeated in the path tracing, branched path tracing and transparent shadow code: * Determine active volume shader at start of the path * Change active volume shader on transmission through a surface * Light attenuation over line segments between camera, surfaces and background This is work by "storm", Stuart Broadfoot, Thomas Dinges and myself.
2013-12-28 15:56:19 +00:00
Ray segment_ray = *ray;
segment_ray.t = isect.t;
Cycles Volume Render: heterogeneous (textured) volumes support. Volumes can now have textured colors and density. There is a Volume Sampling panel in the Render properties with these settings: * Step size: distance between volume shader samples when rendering the volume. Lower values give more accurate and detailed results but also increased render time. * Max steps: maximum number of steps through the volume before giving up, to protect from extremely long render times with big objects or small step sizes. This is much more compute intensive than homogeneous volume, so when you are not using a texture you should enable the Homogeneous Volume option in the material or world for faster rendering. One important missing feature is that Generated texture coordinates are not yet working in volumes, and they are the default coordinates for nearly all texture nodes. So until that works you need to plug in object texture coordinates or a world space position. This is work by "storm", Stuart Broadfoot, Thomas Dinges and myself.
2013-12-29 21:19:38 +00:00
kernel_volume_shadow(kg, &ps, &segment_ray, &throughput);
Cycles Volume Render: support for rendering of homogeneous volume with absorption. This is the simplest possible volume rendering case, constant density inside the volume and no scattering or emission. My plan is to tweak, verify and commit more volume rendering effects one by one, doing it all at once makes it difficult to verify correctness and track down bugs. Documentation is here: http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Materials/Volume Currently this hooks into path tracing in 3 ways, which should get us pretty far until we add more advanced light sampling. These 3 hooks are repeated in the path tracing, branched path tracing and transparent shadow code: * Determine active volume shader at start of the path * Change active volume shader on transmission through a surface * Light attenuation over line segments between camera, surfaces and background This is work by "storm", Stuart Broadfoot, Thomas Dinges and myself.
2013-12-28 15:56:19 +00:00
}
#endif
/* setup shader data at surface */
Code cleanup: move shadow_blocked function into separate file.
2013-12-28 01:56:53 +00:00
ShaderData sd;
shader_setup_from_ray(kg, &sd, &isect, ray, state->bounce+1);
Cycles Volume Render: support for rendering of homogeneous volume with absorption. This is the simplest possible volume rendering case, constant density inside the volume and no scattering or emission. My plan is to tweak, verify and commit more volume rendering effects one by one, doing it all at once makes it difficult to verify correctness and track down bugs. Documentation is here: http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Materials/Volume Currently this hooks into path tracing in 3 ways, which should get us pretty far until we add more advanced light sampling. These 3 hooks are repeated in the path tracing, branched path tracing and transparent shadow code: * Determine active volume shader at start of the path * Change active volume shader on transmission through a surface * Light attenuation over line segments between camera, surfaces and background This is work by "storm", Stuart Broadfoot, Thomas Dinges and myself.
2013-12-28 15:56:19 +00:00
/* attenuation from transparent surface */
if(!(sd.flag & SD_HAS_ONLY_VOLUME)) {
shader_eval_surface(kg, &sd, 0.0f, PATH_RAY_SHADOW, SHADER_CONTEXT_SHADOW);
throughput *= shader_bsdf_transparency(kg, &sd);
}
Code cleanup: move shadow_blocked function into separate file.
2013-12-28 01:56:53 +00:00
Cycles Volume Render: support for rendering of homogeneous volume with absorption. This is the simplest possible volume rendering case, constant density inside the volume and no scattering or emission. My plan is to tweak, verify and commit more volume rendering effects one by one, doing it all at once makes it difficult to verify correctness and track down bugs. Documentation is here: http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Materials/Volume Currently this hooks into path tracing in 3 ways, which should get us pretty far until we add more advanced light sampling. These 3 hooks are repeated in the path tracing, branched path tracing and transparent shadow code: * Determine active volume shader at start of the path * Change active volume shader on transmission through a surface * Light attenuation over line segments between camera, surfaces and background This is work by "storm", Stuart Broadfoot, Thomas Dinges and myself.
2013-12-28 15:56:19 +00:00
/* move ray forward */
Code cleanup: move shadow_blocked function into separate file.
2013-12-28 01:56:53 +00:00
ray->P = ray_offset(sd.P, -sd.Ng);
if(ray->t != FLT_MAX)
ray->D = normalize_len(Pend - ray->P, &ray->t);
Cycles Volume Render: support for rendering of homogeneous volume with absorption. This is the simplest possible volume rendering case, constant density inside the volume and no scattering or emission. My plan is to tweak, verify and commit more volume rendering effects one by one, doing it all at once makes it difficult to verify correctness and track down bugs. Documentation is here: http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Materials/Volume Currently this hooks into path tracing in 3 ways, which should get us pretty far until we add more advanced light sampling. These 3 hooks are repeated in the path tracing, branched path tracing and transparent shadow code: * Determine active volume shader at start of the path * Change active volume shader on transmission through a surface * Light attenuation over line segments between camera, surfaces and background This is work by "storm", Stuart Broadfoot, Thomas Dinges and myself.
2013-12-28 15:56:19 +00:00
#ifdef __VOLUME__
/* exit/enter volume */
Cycles Volume Render: add support for overlapping volume objects. This works pretty much as you would expect, overlapping volume objects gives a more dense volume. What did change is that world volume shaders are now active everywhere, they are no longer excluded inside objects. This may not be desirable and we need to think of better control over this. In some cases you clearly want it to happen, for example if you are rendering a fire in a foggy environment. In other cases like the inside of a house you may not want any fog, but it doesn't seem possible in general for the renderer to automatically determine what is inside or outside of the house. This is implemented using a simple fixed size array of shader/object ID pairs, limited to max 15 overlapping objects. The closures from all shaders are put into a single closure array, exactly the same as if an add shader was used to combine them.
2013-12-28 19:02:40 +00:00
kernel_volume_stack_enter_exit(kg, &sd, ps.volume_stack);
Cycles Volume Render: support for rendering of homogeneous volume with absorption. This is the simplest possible volume rendering case, constant density inside the volume and no scattering or emission. My plan is to tweak, verify and commit more volume rendering effects one by one, doing it all at once makes it difficult to verify correctness and track down bugs. Documentation is here: http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Materials/Volume Currently this hooks into path tracing in 3 ways, which should get us pretty far until we add more advanced light sampling. These 3 hooks are repeated in the path tracing, branched path tracing and transparent shadow code: * Determine active volume shader at start of the path * Change active volume shader on transmission through a surface * Light attenuation over line segments between camera, surfaces and background This is work by "storm", Stuart Broadfoot, Thomas Dinges and myself.
2013-12-28 15:56:19 +00:00
#endif
Code cleanup: move shadow_blocked function into separate file.
2013-12-28 01:56:53 +00:00
bounce++;
}
}
}
Cycles Volume Render: support for rendering of homogeneous volume with absorption. This is the simplest possible volume rendering case, constant density inside the volume and no scattering or emission. My plan is to tweak, verify and commit more volume rendering effects one by one, doing it all at once makes it difficult to verify correctness and track down bugs. Documentation is here: http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Materials/Volume Currently this hooks into path tracing in 3 ways, which should get us pretty far until we add more advanced light sampling. These 3 hooks are repeated in the path tracing, branched path tracing and transparent shadow code: * Determine active volume shader at start of the path * Change active volume shader on transmission through a surface * Light attenuation over line segments between camera, surfaces and background This is work by "storm", Stuart Broadfoot, Thomas Dinges and myself.
2013-12-28 15:56:19 +00:00
#ifdef __VOLUME__
Cycles Volume Render: add support for overlapping volume objects. This works pretty much as you would expect, overlapping volume objects gives a more dense volume. What did change is that world volume shaders are now active everywhere, they are no longer excluded inside objects. This may not be desirable and we need to think of better control over this. In some cases you clearly want it to happen, for example if you are rendering a fire in a foggy environment. In other cases like the inside of a house you may not want any fog, but it doesn't seem possible in general for the renderer to automatically determine what is inside or outside of the house. This is implemented using a simple fixed size array of shader/object ID pairs, limited to max 15 overlapping objects. The closures from all shaders are put into a single closure array, exactly the same as if an add shader was used to combine them.
2013-12-28 19:02:40 +00:00
else if(!result && state->volume_stack[0].shader != SHADER_NO_ID) {
Cycles Volume Render: support for rendering of homogeneous volume with absorption. This is the simplest possible volume rendering case, constant density inside the volume and no scattering or emission. My plan is to tweak, verify and commit more volume rendering effects one by one, doing it all at once makes it difficult to verify correctness and track down bugs. Documentation is here: http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Materials/Volume Currently this hooks into path tracing in 3 ways, which should get us pretty far until we add more advanced light sampling. These 3 hooks are repeated in the path tracing, branched path tracing and transparent shadow code: * Determine active volume shader at start of the path * Change active volume shader on transmission through a surface * Light attenuation over line segments between camera, surfaces and background This is work by "storm", Stuart Broadfoot, Thomas Dinges and myself.
2013-12-28 15:56:19 +00:00
/* apply attenuation from current volume shader */
Cycles Volume Render: heterogeneous (textured) volumes support. Volumes can now have textured colors and density. There is a Volume Sampling panel in the Render properties with these settings: * Step size: distance between volume shader samples when rendering the volume. Lower values give more accurate and detailed results but also increased render time. * Max steps: maximum number of steps through the volume before giving up, to protect from extremely long render times with big objects or small step sizes. This is much more compute intensive than homogeneous volume, so when you are not using a texture you should enable the Homogeneous Volume option in the material or world for faster rendering. One important missing feature is that Generated texture coordinates are not yet working in volumes, and they are the default coordinates for nearly all texture nodes. So until that works you need to plug in object texture coordinates or a world space position. This is work by "storm", Stuart Broadfoot, Thomas Dinges and myself.
2013-12-29 21:19:38 +00:00
kernel_volume_shadow(kg, state, ray, shadow);
Cycles Volume Render: support for rendering of homogeneous volume with absorption. This is the simplest possible volume rendering case, constant density inside the volume and no scattering or emission. My plan is to tweak, verify and commit more volume rendering effects one by one, doing it all at once makes it difficult to verify correctness and track down bugs. Documentation is here: http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Materials/Volume Currently this hooks into path tracing in 3 ways, which should get us pretty far until we add more advanced light sampling. These 3 hooks are repeated in the path tracing, branched path tracing and transparent shadow code: * Determine active volume shader at start of the path * Change active volume shader on transmission through a surface * Light attenuation over line segments between camera, surfaces and background This is work by "storm", Stuart Broadfoot, Thomas Dinges and myself.
2013-12-28 15:56:19 +00:00
}
#endif
Code cleanup: move shadow_blocked function into separate file.
2013-12-28 01:56:53 +00:00
#endif
return result;
}
CCL_NAMESPACE_END
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