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.

1 files changed, 1 insertions, 2 deletions

diff --git a/intern/cycles/render/particles.cpp b/intern/cycles/render/particles.cpp
index 9f951d9673f..2a1570f7a0d 100644
--- a/intern/cycles/render/particles.cpp
+++ b/intern/cycles/render/particles.cpp
@@ -57,8 +57,7 @@ void ParticleSystemManager::device_update_particles(Device *device, DeviceScene
 {
 	/* count particles.
 	 * adds one dummy particle at the beginning to avoid invalid lookups,
-	 * in case a shader uses particle info without actual particle data.
-	 */
+	 * in case a shader uses particle info without actual particle data. */
 	int num_particles = 1;
 	foreach(ParticleSystem *psys, scene->particle_systems)
 		num_particles += psys->particles.size();