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Particle collision bug?

Hello there. I do not know if this is a bug, or it supposed to work. I've checked the ContentExamples for the colliding GPU particles, and it works perfectly, while I'm using an opaque material on my object. When I put a mesh with a translucent material (glass) under the particle system, the collision stops working. Any idea?

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asked Feb 08 '15 at 08:31 PM in Using UE4

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2 answers: sort voted first

Hi Lostra, I believe this is because the translucent material isn't written into the z-buffer which the GPU particles use for collision testing.

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answered Feb 08 '15 at 09:29 PM

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avatar image Lostra01 Feb 09 '15 at 08:19 AM

Do you happen to know any workaround, to have particle collision on a totally transparent, or at least glassy object?

avatar image Jona Feb 09 '15 at 01:13 PM

It should be possible to create a vector field to have your particles look like they are colliding and then have some extra CPU particles to do actual collision.

That'd be a lot of work however.

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Now you can use Distance field instead of scene depth

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answered Oct 10 '15 at 05:15 PM

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