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I have designed this object in Blender (3.0):
After exporting it as .fbx file, and opening this .fbx file in an online viewer, or locally in e.g. Ogre mesh viewer it looks like this:
The thickness of the walls of the box is gone. Do I have to set specific settings when exporting a model from Blender as fbx?
Your thickness is there but you need to "flip your normals". The panels of your box are inside out now.
