Print this post - Re: duplicate shells to simulate rough metal

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I tried to place the cylinder doors in the room in the file and nothing worked,
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sorry, not the cylinders are doors, but the cylinders are stairs (to insert them on the plan into the room)

You can't use cylinders-as-stairs for this. When you import an object and check the staircase box it will import as a staircase but the hole it cuts in the floor is square. It needs a custom cutout which you can't set in the import dialog. You can add the cylinder to a Furniture Library and there you can set a custom cutout.

SVG cutout for a circle:

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M 0.5,0.5 l 0.5,0 A 0.5,0.5 1 1,0 0,0.5 A 0.5,0.5 1 1,0 1,0.5 z

SVG cutout for a dodecagon cylinder:

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M0,0.366022099 v0.267955801 L0.133977901,0.866022099 L0.366022099,1 h0.267955801 L0.866022099,0.866022099 L1,0.633977901 v-0.267955801 L0.866022099,0.133977901 L0.633977901,0 h-0.267955801 L0.133977901,0.133977901 z

For complex cutouts use a window in a wall. For example import a character as a 'door or window' to create a hole with the outline of the character.