Unreliable Shading

Greetings!
I am constantly running into shading problems, namely with CAD and subD geometry. The problem is doubly annoying since the same geometry renders perfect in any other application including offline - b3d, H, as well as realtime engine in Substance Painter

But the most infinitely weird part is that the shading problem disappears if I switch the render to “Path Tracing”

Recalculating normals, even in “Modeling” mode in-engine does not solve the problem. Like I said, the geo renders perfectly elsewhere, and the shading is fixed in Path Tracer, but not in Lit. No Nanite applied.

Images with the Lit vs Path Tracing to illustrate the problem:


Make sure Use High Precision Tangent Basis is enabled on the static mesh (within the static mesh editor).

it is enabled. I tried to reimport and any number of other things, to no avail

seems like any geometry whatsoever should have UV regardless.
at least that solves the “near zero” error mesage

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