The collision modifier doesn't kill particles before the scene's start frame #87883

New Issue

Dimensional · 2021-04-28T16:59:54+02:00

Dimensional commented

2021-04-28 16:59:54 +02:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 960M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 465.89

Blender Version
Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-04-17 20:13, hash: 8d30a7a1cf
Worked: It didn't work on 2.79

Short description of error
Particles that start before the scene's start frame aren't killed by objects with a collision modifier that is set to kill particles.

Exact steps for others to reproduce the error

Add an object (A);
Add a particle system to A;
Add another object (B);
Add a collision modifier to B;
Set use_particle_kill to True on B's collision modifier;
Set frame_start to a negative number on A's particle system;
Move the objects so that the particles of A will eventually touch B before the scene's frame_start;
Play the animation.
collision_does_not_kill_particles_before_start_frame.blend

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: NVIDIA GeForce GTX 960M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 465.89 **Blender Version** Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-04-17 20:13, hash: `8d30a7a1cf` Worked: It didn't work on 2.79 **Short description of error** Particles that start before the scene's start frame aren't killed by objects with a collision modifier that is set to kill particles. **Exact steps for others to reproduce the error** 1. Add an object (A); 2. Add a particle system to A; 3. Add another object (B); 4. Add a collision modifier to B; 5. Set use_particle_kill to True on B's collision modifier; 6. Set frame_start to a negative number on A's particle system; 7. Move the objects so that the particles of A will eventually touch B before the scene's frame_start; 8. Play the animation. [collision_does_not_kill_particles_before_start_frame.blend](https://archive.blender.org/developer/F10043277/collision_does_not_kill_particles_before_start_frame.blend)

Dimensional commented

2021-04-28 16:59:54 +02:00

Added subscriber: @duodequinquagesimum

Philipp Oeser commented

2021-07-13 14:38:08 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2021-07-13 14:38:08 +02:00

Hi and thx reporting!

There is a way to make this work:

allow negative frames in Preferences > Animation
scrub to the (negative) startframe of your simulation (in your case -200)
bake simulation from there
collision should work in the negative range then as well

Of course this is less then ideal (it is a mere workaround), but this issue has been reported before, see #71075 (Particle collisions aren't simulated before frame zero for negative frame simulations), will merge these reports.

Hi and thx reporting! There is a way to make this work: - allow negative frames in Preferences > Animation - scrub to the (negative) startframe of your simulation (in your case -200) - bake simulation from there - collision should work in the negative range then as well Of course this is less then ideal (it is a mere workaround), but this issue has been reported before, see #71075 (Particle collisions aren't simulated before frame zero for negative frame simulations), will merge these reports.

Philipp Oeser commented

2021-07-13 14:38:20 +02:00

Closed as duplicate of #71075

Philipp Oeser closed this issue

2021-07-13 14:38:20 +02:00

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The collision modifier doesn't kill particles before the scene's start frame #87883