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Particle collisions aren't simulated before frame zero for negative frame simulations
Open, Needs Triage by DeveloperPublic


System Information
Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 436.15

Blender Version
Broken: version: 2.81 (sub 15), branch: master, commit date: 2019-10-12 15:33, hash: rB95f020c853d6
Worked: (optional)

Short description of error
Making particles simulation start from negative frames don't allow for those particles to have collisions with meshes

Exact steps for others to reproduce the error

Open the file and look at the already baked simulation. The first particles went through while the later ones collide perfectly. You can also rebake the cache and see the same result



Event Timeline