Hello Tim,
Well I deserve no medal ^^
Our engineer found out about that after looking at the code in an attempt to debug it, he crawled back to the GUI and showed it to me but as he pointed out there is a weird behavior between destructible and shadows anyway
Here is a dynamic light with a destructible mesh (unaltered)
Everything is fine, shadow casting (thank to the “weird” material setting)
Now below, I’m just hitting play (two different sessions) and shooting at the pillar.
Sometimes I get the shadows on the chunks and it stays… and sometime I get the shadows for a very short moment before it “dissolves” away (but as you can see the pillar is still casting shadow)
In other word I get shadows 100% of the time on Destruction depth 0 and sometimes I get shadows on Destruction Depth 1 and below.
Note: No crumbling chunks or despawning settings on the destructible mesh itself which could explain this behavior.