Reproduction Steps
Simply position a particle emitter so that the particles clip the ground. Assuming your graphics settings are high enough, you’ll notice the particles blend into the ground where it clips. Now change the ZIndex to -1; instead of blending it will now cut off in a hard line.
Expected Behavior
I expect the particles to blend with surrounding geometry properly regardless of the ZIndex setting, like so
Actual Behavior
Instead, if you set the ZIndex to a negative value, moving it behind the part, the blending starts to misbehave
Issue Area: Engine
Issue Type: Display
Impact: High
Frequency: Constantly