Black/Transparent squares when using bloom

[BananableOffense]

Parts of an imported character' mesh are glowing. Doesn't seem to be material related.

Im pretty sure this has something to do will NaN values existing in the gbuffer somewhere, perhaps the normals? A NaN normal would appear black typically, as when the engine tries to calculate direct lighting it would fail. And when a NaN pixel gets sampled during postprocessing effects, things can get weird. I’m guessing something messed up with either during the mesh import settings, or there’s some defect in the mesh normal vectors. If it happens regardless of material, it must be the mesh…

Take a look at this post.