Thanks VeroniQ, I will give it a try tonight!

<t>Hello everyone, <br/>
<br/>
I encounter a glitch, where a roof build by walls, then exported as object and reimported as furniture, shows a flat rectangular surface, where the floor once was. <br/>
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Is it possible to undestand what I mean? Soory for my bad english... <br/>
<br/>
Btw. how do ...