I have problem with my object, I made A terrace near the house, and my planks, most of them are incorect, I was thinking that the normals are flipped, but they are not, material is the same, tried Xform, nothing helps. Maybe you know, how to fix this problem? even exported in Lumion, the same problem exist.
Sorry for my bad English. Could you help me? thank you.
Just a hunch - Try applying a smooth modifier to the planks.
With Auto smooth and Prevent Indirect Smoothing turned OFF.
See if that changes the result.