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Sometimes when particles are playing, I'm noticing there are times where translucent objects that are behind the particle system (Emitter) render in front of particles as shown in the image below. Now, this issue seems to only happen with materials that have the UE4 Material blend mode 'Translucent' or 'Masked' set. I have also found that by adding the DitherTemporalAA Node to the translucent material it seems to stop this sorting issue also show below. 

Any suggestions as to what is coursing this could be helpful and more information can be provided upon request.


by Jamesking96 (960 points)

1 Answer

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Hi James,

I cannot see much on the first screenshot you attached, but transparent object sorting can definitely be an issue with PopcornFX particles and UE4 translucent geometry. If the effect you created has a large bbox it can overlap with other UE4 geometry, leading to sort issues.

Please reach the support mail, if you can provide the effect or more informations that could be useful to find a solution. The actual response to this problem though is "it's normal, but it can be worked around", as it mainly depends on your exact situation.

by HugoPKFX (16.8k points)