When i export my object from blender to unreal engine,i cant get close them,get inside them,if i make house open inside cant go invisible wall,but if i export all mesh seperate and build it like in blender that work just fine.
Open the static mesh, click show > show simple collisions. Likely a large collision box is around your mesh. Click remove collisions and then either re make the simple collisions or use “Use complex collisions as simple”.
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What @markpeters suggested will solve the issue but I would also recommend breaking down big meshes like this into smaller ones and importing them separately. It’s usually better for performance, lighting, collisions etc…
Kinda off-topic but,
Using a lot of materials like this in a single mesh could drastically increase your draw calls, reducing performance.
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