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test2/intern/cycles/blender/particles.cpp

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License headers: use SPDX-FileCopyrightText in intern/cycles
2023-06-14 16:52:36 +10:00
/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
*
* SPDX-License-Identifier: Apache-2.0 */
Particle Info node for Cycles. This can be used to access particle information in material shaders for dupli objects. For now only the particle Age and individual Lifetime (in frames) are supported, more attributes can be added when needed. The particle data is stored in a separate texture if any of the dupli objects uses particle info nodes in shaders. To map dupli objects onto particles the store an additional particle_index value, which is different from the simple dupli object index (only visible particles, also works for particle dupli groups mode). Some simple use cases on the code.blender.org blog: http://code.blender.org/index.php/2012/05/particle-info-node/
2012-06-08 16:17:57 +00:00
Cycles: remove prefix from source code file names Remove prefix of filenames that is the same as the folder name. This used to help when #includes were using individual files, but now they are always relative to the cycles root directory and so the prefixes are redundant. For patches and branches, git merge and rebase should be able to detect the renames and move over code to the right file.
2021-10-24 14:19:19 +02:00
#include "scene/particles.h"
Cycles: changes to source code folders structure * Split render/ into scene/ and session/. The scene/ folder now contains the scene and its nodes. The session/ folder contains the render session and associated data structures like drivers and render buffers. * Move top level kernel headers into new folders kernel/camera/, kernel/film/, kernel/light/, kernel/sample/, kernel/util/ * Move integrator related kernel headers into kernel/integrator/ * Move OSL shaders from kernel/shaders/ to kernel/osl/shaders/ For patches and branches, git merge and rebase should be able to detect the renames and move over code to the right file.
2021-10-24 14:19:19 +02:00
#include "scene/mesh.h"
#include "scene/object.h"
Fix for #32184 and redesign of particle storage in Cycles. The particle data used by the Particle Info node was stored in cycles as a list in each object. This is a problem when the particle emitter mesh is hidden: Objects in cycles are only intended as instances of renderable meshes, so when hiding the emitter mesh the particle data doesn't get stored either. Also the particle data can potentially be copied to multiple instances of the same object, which is a waste of texture space. The solution in this patch is to make a completely separate list of particle systems in the Cycles scene data. This way the particle data can be generated even when the emitter object itself is not visible.
2012-08-31 17:27:08 +00:00
Cycles: remove prefix from source code file names Remove prefix of filenames that is the same as the folder name. This used to help when #includes were using individual files, but now they are always relative to the cycles root directory and so the prefixes are redundant. For patches and branches, git merge and rebase should be able to detect the renames and move over code to the right file.
2021-10-24 14:19:19 +02:00
#include "blender/sync.h"
#include "blender/util.h"
Particle Info node for Cycles. This can be used to access particle information in material shaders for dupli objects. For now only the particle Age and individual Lifetime (in frames) are supported, more attributes can be added when needed. The particle data is stored in a separate texture if any of the dupli objects uses particle info nodes in shaders. To map dupli objects onto particles the store an additional particle_index value, which is different from the simple dupli object index (only visible particles, also works for particle dupli groups mode). Some simple use cases on the code.blender.org blog: http://code.blender.org/index.php/2012/05/particle-info-node/
2012-06-08 16:17:57 +00:00
CCL_NAMESPACE_BEGIN
/* Utilities */
Cycles: Pass Blender's C++ RNA structures by reference This way we avoid passing structures which could be up to few hundred bytes by value to the utility functions. Ideally we'll also have to add `const` qualifier in majority of the calls, but C++ RNA does not allow us to do that because it does not know if some function modifies contents or not.
2016-01-30 14:18:29 +01:00
bool BlenderSync::sync_dupli_particle(BL::Object &b_ob,
Depsgraph API: renaming, more granular update information. * depsgraph.ids: all evaluated datablocks in the depsgraph * depsgraph.objects: all evaluated objects in the depsgraph * depsgraph.object_instances: all object instances to display or render * depsgraph.updates: list of updates to datablocks
2018-05-30 15:21:21 +02:00
BL::DepsgraphObjectInstance &b_instance,
Cycles: Pass Blender's C++ RNA structures by reference This way we avoid passing structures which could be up to few hundred bytes by value to the utility functions. Ideally we'll also have to add `const` qualifier in majority of the calls, but C++ RNA does not allow us to do that because it does not know if some function modifies contents or not.
2016-01-30 14:18:29 +01:00
Object *object)
Fix for #32184 and redesign of particle storage in Cycles. The particle data used by the Particle Info node was stored in cycles as a list in each object. This is a problem when the particle emitter mesh is hidden: Objects in cycles are only intended as instances of renderable meshes, so when hiding the emitter mesh the particle data doesn't get stored either. Also the particle data can potentially be copied to multiple instances of the same object, which is a waste of texture space. The solution in this patch is to make a completely separate list of particle systems in the Cycles scene data. This way the particle data can be generated even when the emitter object itself is not visible.
2012-08-31 17:27:08 +00:00
{
Cleanup: correct spelling in comments
2021-02-05 16:23:34 +11:00
/* Test if this dupli was generated from a particle system. */
Depsgraph API: renaming, more granular update information. * depsgraph.ids: all evaluated datablocks in the depsgraph * depsgraph.objects: all evaluated objects in the depsgraph * depsgraph.object_instances: all object instances to display or render * depsgraph.updates: list of updates to datablocks
2018-05-30 15:21:21 +02:00
BL::ParticleSystem b_psys = b_instance.particle_system();
Cleanup: use braces for sources in intern/ Omitted intern/itasc as some of these sources are from KDL: https://www.orocos.org/kdl.html
2023-09-17 09:01:48 +10:00
if (!b_psys) {
Fix #33113: cycles not rendering motion blur correct with dying particles. There were a bunch of other issues with dupli motion blur and syncing, the problem being that there was no proper way to detect corresponding duplis between frames or updates. As a solution, a persistent_id was added to the DupliObject. It's an extension of the previous index value, with one index for each dupli level. This can be used to reliably find matching dupli objects between frames. Works with nested duplis, multiple particle systems, etc.
2012-11-08 16:35:28 +00:00
return false;
Cleanup: use braces for sources in intern/ Omitted intern/itasc as some of these sources are from KDL: https://www.orocos.org/kdl.html
2023-09-17 09:01:48 +10:00
}
ClangFormat: apply to source, most of intern Apply clang format as proposed in T53211. For details on usage and instructions for migrating branches without conflicts, see: https://wiki.blender.org/wiki/Tools/ClangFormat
2019-04-17 06:17:24 +02:00
Cycles API: encapsulate Node socket members This encapsulates Node socket members behind a set of specific methods; as such it is no longer possible to directly access Node class members from exporters and parts of Cycles. The methods are defined via the NODE_SOCKET_API macros in `graph/ node.h`, and are for getting or setting a specific socket's value, as well as querying or modifying the state of its update flag. The setters will check whether the value has changed and tag the socket as modified appropriately. This will let us know how a Node has changed and what to update, which is the first concrete step toward a more granular scene update system. Since the setters will tag the Node sockets as modified when passed different data, this patch also removes the various modified methods on Nodes in favor of Node::is_modified which checks the sockets' update flags status. Reviewed By: brecht Maniphest Tasks: T79174 Differential Revision: https://developer.blender.org/D8544
2020-11-04 11:17:38 +01:00
object->set_hide_on_missing_motion(true);
ClangFormat: apply to source, most of intern Apply clang format as proposed in T53211. For details on usage and instructions for migrating branches without conflicts, see: https://wiki.blender.org/wiki/Tools/ClangFormat
2019-04-17 06:17:24 +02:00
Fix #33113: cycles not rendering motion blur correct with dying particles. There were a bunch of other issues with dupli motion blur and syncing, the problem being that there was no proper way to detect corresponding duplis between frames or updates. As a solution, a persistent_id was added to the DupliObject. It's an extension of the previous index value, with one index for each dupli level. This can be used to reliably find matching dupli objects between frames. Works with nested duplis, multiple particle systems, etc.
2012-11-08 16:35:28 +00:00
/* test if we need particle data */
Cleanup: use braces for sources in intern/ Omitted intern/itasc as some of these sources are from KDL: https://www.orocos.org/kdl.html
2023-09-17 09:01:48 +10:00
if (!object->get_geometry()->need_attribute(scene, ATTR_STD_PARTICLE)) {
Fix #33113: cycles not rendering motion blur correct with dying particles. There were a bunch of other issues with dupli motion blur and syncing, the problem being that there was no proper way to detect corresponding duplis between frames or updates. As a solution, a persistent_id was added to the DupliObject. It's an extension of the previous index value, with one index for each dupli level. This can be used to reliably find matching dupli objects between frames. Works with nested duplis, multiple particle systems, etc.
2012-11-08 16:35:28 +00:00
return false;
Cleanup: use braces for sources in intern/ Omitted intern/itasc as some of these sources are from KDL: https://www.orocos.org/kdl.html
2023-09-17 09:01:48 +10:00
}
ClangFormat: apply to source, most of intern Apply clang format as proposed in T53211. For details on usage and instructions for migrating branches without conflicts, see: https://wiki.blender.org/wiki/Tools/ClangFormat
2019-04-17 06:17:24 +02:00
Fix #33113: cycles not rendering motion blur correct with dying particles. There were a bunch of other issues with dupli motion blur and syncing, the problem being that there was no proper way to detect corresponding duplis between frames or updates. As a solution, a persistent_id was added to the DupliObject. It's an extension of the previous index value, with one index for each dupli level. This can be used to reliably find matching dupli objects between frames. Works with nested duplis, multiple particle systems, etc.
2012-11-08 16:35:28 +00:00
/* don't handle child particles yet */
Depsgraph API: renaming, more granular update information. * depsgraph.ids: all evaluated datablocks in the depsgraph * depsgraph.objects: all evaluated objects in the depsgraph * depsgraph.object_instances: all object instances to display or render * depsgraph.updates: list of updates to datablocks
2018-05-30 15:21:21 +02:00
BL::Array<int, OBJECT_PERSISTENT_ID_SIZE> persistent_id = b_instance.persistent_id();
ClangFormat: apply to source, most of intern Apply clang format as proposed in T53211. For details on usage and instructions for migrating branches without conflicts, see: https://wiki.blender.org/wiki/Tools/ClangFormat
2019-04-17 06:17:24 +02:00
Cleanup: use braces for sources in intern/ Omitted intern/itasc as some of these sources are from KDL: https://www.orocos.org/kdl.html
2023-09-17 09:01:48 +10:00
if (persistent_id[0] >= b_psys.particles.length()) {
Fix #33113: cycles not rendering motion blur correct with dying particles. There were a bunch of other issues with dupli motion blur and syncing, the problem being that there was no proper way to detect corresponding duplis between frames or updates. As a solution, a persistent_id was added to the DupliObject. It's an extension of the previous index value, with one index for each dupli level. This can be used to reliably find matching dupli objects between frames. Works with nested duplis, multiple particle systems, etc.
2012-11-08 16:35:28 +00:00
return false;
Cleanup: use braces for sources in intern/ Omitted intern/itasc as some of these sources are from KDL: https://www.orocos.org/kdl.html
2023-09-17 09:01:48 +10:00
}
ClangFormat: apply to source, most of intern Apply clang format as proposed in T53211. For details on usage and instructions for migrating branches without conflicts, see: https://wiki.blender.org/wiki/Tools/ClangFormat
2019-04-17 06:17:24 +02:00
Fix #33113: cycles not rendering motion blur correct with dying particles. There were a bunch of other issues with dupli motion blur and syncing, the problem being that there was no proper way to detect corresponding duplis between frames or updates. As a solution, a persistent_id was added to the DupliObject. It's an extension of the previous index value, with one index for each dupli level. This can be used to reliably find matching dupli objects between frames. Works with nested duplis, multiple particle systems, etc.
2012-11-08 16:35:28 +00:00
/* find particle system */
ParticleSystemKey key(b_ob, persistent_id);
ParticleSystem *psys;
ClangFormat: apply to source, most of intern Apply clang format as proposed in T53211. For details on usage and instructions for migrating branches without conflicts, see: https://wiki.blender.org/wiki/Tools/ClangFormat
2019-04-17 06:17:24 +02:00
Fix #33113: cycles not rendering motion blur correct with dying particles. There were a bunch of other issues with dupli motion blur and syncing, the problem being that there was no proper way to detect corresponding duplis between frames or updates. As a solution, a persistent_id was added to the DupliObject. It's an extension of the previous index value, with one index for each dupli level. This can be used to reliably find matching dupli objects between frames. Works with nested duplis, multiple particle systems, etc.
2012-11-08 16:35:28 +00:00
bool first_use = !particle_system_map.is_used(key);
Fix T82129: Cycles "Persistent Images" incorrectly retains scene data The issue stems from the fact that scene arrays are not cleared when rendering is done. This was not really an issue before the introduction of the ownership system (rB429afe0c626a) as the id_map would recreate scene data arrays based on their new content. However, now that the id_maps do not have access to the scene data anymore the arrays are never created. Another related issue is that the BlenderSync instance is never freed when the persistent data option is activated. To fix this, we delete nodes created by the id_maps in their destructors, and delete the BlenderSync instance before creating a new one, so the id_maps destructors are actually called. Reviewed By: brecht Maniphest Tasks: T82129 Differential Revision: https://developer.blender.org/D9378
2020-10-29 14:40:29 +01:00
bool need_update = particle_system_map.add_or_update(&psys, b_ob, b_instance.object(), key);
ClangFormat: apply to source, most of intern Apply clang format as proposed in T53211. For details on usage and instructions for migrating branches without conflicts, see: https://wiki.blender.org/wiki/Tools/ClangFormat
2019-04-17 06:17:24 +02:00
Fix #33113: cycles not rendering motion blur correct with dying particles. There were a bunch of other issues with dupli motion blur and syncing, the problem being that there was no proper way to detect corresponding duplis between frames or updates. As a solution, a persistent_id was added to the DupliObject. It's an extension of the previous index value, with one index for each dupli level. This can be used to reliably find matching dupli objects between frames. Works with nested duplis, multiple particle systems, etc.
2012-11-08 16:35:28 +00:00
/* no update needed? */
Cycles API: encapsulate Node socket members This encapsulates Node socket members behind a set of specific methods; as such it is no longer possible to directly access Node class members from exporters and parts of Cycles. The methods are defined via the NODE_SOCKET_API macros in `graph/ node.h`, and are for getting or setting a specific socket's value, as well as querying or modifying the state of its update flag. The setters will check whether the value has changed and tag the socket as modified appropriately. This will let us know how a Node has changed and what to update, which is the first concrete step toward a more granular scene update system. Since the setters will tag the Node sockets as modified when passed different data, this patch also removes the various modified methods on Nodes in favor of Node::is_modified which checks the sockets' update flags status. Reviewed By: brecht Maniphest Tasks: T79174 Differential Revision: https://developer.blender.org/D8544
2020-11-04 11:17:38 +01:00
if (!need_update && !object->get_geometry()->is_modified() &&
Cycles: optimize device updates This optimizes device updates (during user edits or frame changes in the viewport) by avoiding unnecessary computations. To achieve this, we use a combination of the sockets' update flags as well as some new flags passed to the various managers when tagging for an update to tell exactly what the tagging is for (e.g. shader was modified, object was removed, etc.). Besides avoiding recomputations, we also avoid resending to the devices unmodified data arrays, thus reducing bandwidth usage. For OptiX and Embree, BVH packing was also multithreaded. The performance improvements may vary depending on the used device (CPU or GPU), and the content of the scene. Simple scenes (e.g. with no adaptive subdivision or volumes) rendered using OptiX will benefit from this work the most. On average, for a variety of animated scenes, this gives a 3x speedup. Reviewed By: #cycles, brecht Maniphest Tasks: T79174 Differential Revision: https://developer.blender.org/D9555
2021-01-22 15:01:26 +01:00
!scene->object_manager->need_update())
Cleanup: use braces for sources in intern/ Omitted intern/itasc as some of these sources are from KDL: https://www.orocos.org/kdl.html
2023-09-17 09:01:48 +10:00
{
Fix #33113: cycles not rendering motion blur correct with dying particles. There were a bunch of other issues with dupli motion blur and syncing, the problem being that there was no proper way to detect corresponding duplis between frames or updates. As a solution, a persistent_id was added to the DupliObject. It's an extension of the previous index value, with one index for each dupli level. This can be used to reliably find matching dupli objects between frames. Works with nested duplis, multiple particle systems, etc.
2012-11-08 16:35:28 +00:00
return true;
Cleanup: use braces for sources in intern/ Omitted intern/itasc as some of these sources are from KDL: https://www.orocos.org/kdl.html
2023-09-17 09:01:48 +10:00
}
ClangFormat: apply to source, most of intern Apply clang format as proposed in T53211. For details on usage and instructions for migrating branches without conflicts, see: https://wiki.blender.org/wiki/Tools/ClangFormat
2019-04-17 06:17:24 +02:00
Fix #33113: cycles not rendering motion blur correct with dying particles. There were a bunch of other issues with dupli motion blur and syncing, the problem being that there was no proper way to detect corresponding duplis between frames or updates. As a solution, a persistent_id was added to the DupliObject. It's an extension of the previous index value, with one index for each dupli level. This can be used to reliably find matching dupli objects between frames. Works with nested duplis, multiple particle systems, etc.
2012-11-08 16:35:28 +00:00
/* first time used in this sync loop? clear and tag update */
if (first_use) {
Fix for #32184 and redesign of particle storage in Cycles. The particle data used by the Particle Info node was stored in cycles as a list in each object. This is a problem when the particle emitter mesh is hidden: Objects in cycles are only intended as instances of renderable meshes, so when hiding the emitter mesh the particle data doesn't get stored either. Also the particle data can potentially be copied to multiple instances of the same object, which is a waste of texture space. The solution in this patch is to make a completely separate list of particle systems in the Cycles scene data. This way the particle data can be generated even when the emitter object itself is not visible.
2012-08-31 17:27:08 +00:00
psys->particles.clear();
Cycles: Tag particle systems after syncing to make sure the particle system manager updates the device data.
2012-08-31 19:39:03 +00:00
psys->tag_update(scene);
Particle Info node for Cycles. This can be used to access particle information in material shaders for dupli objects. For now only the particle Age and individual Lifetime (in frames) are supported, more attributes can be added when needed. The particle data is stored in a separate texture if any of the dupli objects uses particle info nodes in shaders. To map dupli objects onto particles the store an additional particle_index value, which is different from the simple dupli object index (only visible particles, also works for particle dupli groups mode). Some simple use cases on the code.blender.org blog: http://code.blender.org/index.php/2012/05/particle-info-node/
2012-06-08 16:17:57 +00:00
}
ClangFormat: apply to source, most of intern Apply clang format as proposed in T53211. For details on usage and instructions for migrating branches without conflicts, see: https://wiki.blender.org/wiki/Tools/ClangFormat
2019-04-17 06:17:24 +02:00
Fix #33113: cycles not rendering motion blur correct with dying particles. There were a bunch of other issues with dupli motion blur and syncing, the problem being that there was no proper way to detect corresponding duplis between frames or updates. As a solution, a persistent_id was added to the DupliObject. It's an extension of the previous index value, with one index for each dupli level. This can be used to reliably find matching dupli objects between frames. Works with nested duplis, multiple particle systems, etc.
2012-11-08 16:35:28 +00:00
/* add particle */
BL::Particle b_pa = b_psys.particles[persistent_id[0]];
update
2024-07-22 09:52:19 +02:00
Particle pa;
Revert "update" This reverts commit c4f99bcb6c5eca9bd43c13f86e40f5ae80dfe712.
2024-07-22 09:54:02 +02:00
Fix #33113: cycles not rendering motion blur correct with dying particles. There were a bunch of other issues with dupli motion blur and syncing, the problem being that there was no proper way to detect corresponding duplis between frames or updates. As a solution, a persistent_id was added to the DupliObject. It's an extension of the previous index value, with one index for each dupli level. This can be used to reliably find matching dupli objects between frames. Works with nested duplis, multiple particle systems, etc.
2012-11-08 16:35:28 +00:00
pa.index = persistent_id[0];
Fix T77307: Particle Info Node Does Not Consider Time Remapping `frame_current_final()` should be used to access the Scene time after remapping, which also matches how the particles system handles time. Reviewed By: brecht Maniphest Tasks: T77307 Differential Revision: https://developer.blender.org/D12239
2021-08-13 13:31:21 +02:00
pa.age = b_scene.frame_current_final() - b_pa.birth_time();
Fix #33113: cycles not rendering motion blur correct with dying particles. There were a bunch of other issues with dupli motion blur and syncing, the problem being that there was no proper way to detect corresponding duplis between frames or updates. As a solution, a persistent_id was added to the DupliObject. It's an extension of the previous index value, with one index for each dupli level. This can be used to reliably find matching dupli objects between frames. Works with nested duplis, multiple particle systems, etc.
2012-11-08 16:35:28 +00:00
pa.lifetime = b_pa.lifetime();
pa.location = get_float3(b_pa.location());
pa.rotation = get_float4(b_pa.rotation());
pa.size = b_pa.size();
pa.velocity = get_float3(b_pa.velocity());
pa.angular_velocity = get_float3(b_pa.angular_velocity());
ClangFormat: apply to source, most of intern Apply clang format as proposed in T53211. For details on usage and instructions for migrating branches without conflicts, see: https://wiki.blender.org/wiki/Tools/ClangFormat
2019-04-17 06:17:24 +02:00
Code refactor: modify mesh storage to use arrays rather than vectors, separate some arrays. Differential Revision: https://developer.blender.org/D2016
2016-05-08 00:09:08 +02:00
psys->particles.push_back_slow(pa);
ClangFormat: apply to source, most of intern Apply clang format as proposed in T53211. For details on usage and instructions for migrating branches without conflicts, see: https://wiki.blender.org/wiki/Tools/ClangFormat
2019-04-17 06:17:24 +02:00
Cycles API: encapsulate Node socket members This encapsulates Node socket members behind a set of specific methods; as such it is no longer possible to directly access Node class members from exporters and parts of Cycles. The methods are defined via the NODE_SOCKET_API macros in `graph/ node.h`, and are for getting or setting a specific socket's value, as well as querying or modifying the state of its update flag. The setters will check whether the value has changed and tag the socket as modified appropriately. This will let us know how a Node has changed and what to update, which is the first concrete step toward a more granular scene update system. Since the setters will tag the Node sockets as modified when passed different data, this patch also removes the various modified methods on Nodes in favor of Node::is_modified which checks the sockets' update flags status. Reviewed By: brecht Maniphest Tasks: T79174 Differential Revision: https://developer.blender.org/D8544
2020-11-04 11:17:38 +01:00
object->set_particle_system(psys);
object->set_particle_index(psys->particles.size() - 1);
Cleanup: use braces for sources in intern/ Omitted intern/itasc as some of these sources are from KDL: https://www.orocos.org/kdl.html
2023-09-17 09:01:48 +10:00
if (object->particle_index_is_modified()) {
Cycles: optimize device updates This optimizes device updates (during user edits or frame changes in the viewport) by avoiding unnecessary computations. To achieve this, we use a combination of the sockets' update flags as well as some new flags passed to the various managers when tagging for an update to tell exactly what the tagging is for (e.g. shader was modified, object was removed, etc.). Besides avoiding recomputations, we also avoid resending to the devices unmodified data arrays, thus reducing bandwidth usage. For OptiX and Embree, BVH packing was also multithreaded. The performance improvements may vary depending on the used device (CPU or GPU), and the content of the scene. Simple scenes (e.g. with no adaptive subdivision or volumes) rendered using OptiX will benefit from this work the most. On average, for a variety of animated scenes, this gives a 3x speedup. Reviewed By: #cycles, brecht Maniphest Tasks: T79174 Differential Revision: https://developer.blender.org/D9555
2021-01-22 15:01:26 +01:00
scene->object_manager->tag_update(scene, ObjectManager::PARTICLE_MODIFIED);
Cleanup: use braces for sources in intern/ Omitted intern/itasc as some of these sources are from KDL: https://www.orocos.org/kdl.html
2023-09-17 09:01:48 +10:00
}
ClangFormat: apply to source, most of intern Apply clang format as proposed in T53211. For details on usage and instructions for migrating branches without conflicts, see: https://wiki.blender.org/wiki/Tools/ClangFormat
2019-04-17 06:17:24 +02:00
Fix #33113: cycles not rendering motion blur correct with dying particles. There were a bunch of other issues with dupli motion blur and syncing, the problem being that there was no proper way to detect corresponding duplis between frames or updates. As a solution, a persistent_id was added to the DupliObject. It's an extension of the previous index value, with one index for each dupli level. This can be used to reliably find matching dupli objects between frames. Works with nested duplis, multiple particle systems, etc.
2012-11-08 16:35:28 +00:00
/* return that this object has particle data */
return true;
Particle Info node for Cycles. This can be used to access particle information in material shaders for dupli objects. For now only the particle Age and individual Lifetime (in frames) are supported, more attributes can be added when needed. The particle data is stored in a separate texture if any of the dupli objects uses particle info nodes in shaders. To map dupli objects onto particles the store an additional particle_index value, which is different from the simple dupli object index (only visible particles, also works for particle dupli groups mode). Some simple use cases on the code.blender.org blog: http://code.blender.org/index.php/2012/05/particle-info-node/
2012-06-08 16:17:57 +00:00
}
CCL_NAMESPACE_END
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