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Vertex Weight Proximity Modifier can't affect particles density (no realtime feedback)
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System Information
Windows 7 64bits
GeForce GTS450

Blender Version
Broken: Blender 2.69 r60995 (official)

Short description of error
Vertex Weight Proximity Modifier (VWPM) seems to have an inconsistency behavior over Particles Vertex Groups Settings.
If I put it over the Length slot it works as expected (with realtime feedback). But the VWPM have no effect over the Density slot.

If I enable "Use Modifier Stack" inside Particles's Emission Panel, the modifier works over the Density slot, but with no realtime feedback.
After any change to VWPM, I have to disable and enable again "Use Modifier Stack" button to update particles and see the changes.

I made a test sample file:




Event Timeline

Bastien Montagne (mont29) lowered the priority of this task from Needs Triage by Developer to Confirmed, Medium.

This is a known limitation of current particle system, which just does not support dynamic vgroups (which did not existed at time it was coded ;) )… More like a TODO item for a future particle rewrite.