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Hey! I have a exported model from Google Sketchup of a house. The model looks fine, but sketchup model of a wall can only be seen from one side - its invisible from the other side. Do you know if there is anything to do aobut this? I found a really good model of a house on the internet, and I want to use it in my game, but the walls in the house are invisible from the inside.
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the problem is with the face normals. I think if you export as fbx format you have the option to make faces 2 sided. I don't really remember exactly which format does have the 2-sided faces option. You may wanna try obj and fbx and pay attention to the export options.
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try revesring the faces,,in monochrome view reverse all the blue faces!!
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you might need to model internal wall in sketchup
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Unity by default only renders one side of a polygon. Planes will have their normals visible but the other side will be culled. The reason I commented instead of answered is that I have a suspicion that you can disable this culling and have both sides rendered, but if so I don't know how.
If not you may have to replace the planes with 3D walls, or duplicate and reverse the normals. The latter method may result in small artifacts if you don't offset their positions slightly.