I converted a CAD file to an OBJ file for Blender, afterwards I want to import it to unreal engine. In Blender I see all extra meshes, which I don’t see in unreal. Unreal does create shadows for these, as shown in the picture below. I have also included a picture of the blender file, importing the DWG file does not come out nicely in unreal engine. The autocad file was created with SOLIDS.
Can anyone help me out?
I don’t think I fully understand what you’re describing, but here are a couple things to consider. In your last 2 images you have strange dark gradients on the outer wall and maybe even a “missing wall”. This looks to me like a problem with your Normals. In the Static Mesh settings for this asset you should be able to Recompute Normals, which should have defaulted to ON. Another way to try to recompute normals in UE is to enable the Modeling Tools plugin, go into Modeling Mode, and go to Attributes > Normals and recompute there. You could also flip normals for specific faces here, but in your case you should do that in Blender.
Really this needs to be fixed in the source file in Blender. Make sure you’re exporting with all smoothing groups intact. I’m not a Blender user, but there might be a way to preview single-sided faces. UE only renders the front face of polygons and some of yours may be backwards.
