You can try turning on double sided faces for that object, by disabling Cull Back Faces in the object properties. If that doesnt work, I would just cap off the mesh (if the bottom faces are missing, which I assume). Thanks, Im getting this too, Ill log it in our bug system.
it does look like a bug. also, notice how the backfaces are darkened when cast shadow is on. with shadows off, both front faces and back faces render with same lighting but with shadows on, the back faces seem to self shadow as well. if someone else can download the test files i posted and see if this is not a GPU specific…
Hi. Sorry to bother with double sided material stuff again. But doubling faces does not really work. As soon as I put in a light and turn on Cast Shadows the outer faces seem to cast shadows on the inner faces. And this shadow looks through and causes artifacts :(. That makes me a bit sad. Any rough guess when double sided…