Decal disappears forever after Fade Duration in PIE
I have reproduced it in both forward rendering w and w/o. Engine version: 4.14.3
asked Feb 10 '17 at 07:52 AM in Bug Reports
The Fade Start and Fade Duration aren't meant to be used in this manner. It is by design that they are independent from fade screen size.
Those two settings are for temporary decals that are meant to be removed after a duration. For example a blood stain or a puddle that evaporates. Leave those values at zero if you don't want the decal actor to disappear.
TL;DR The behavior you are describing is expected.
answered Feb 10 '17 at 03:52 PM
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