Unextend walls either not working or deleting the whole wall

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I am having a wierd issue with trying to unextend a wall. Following from another topic I had where doing raked walls created an odd junction, I took the advice of creating the walls at their maximum height then unextending them…or trying to.

See videos…am I doing something wrong or is this a bug?

Hi Jackson,
The “unextend” option just undoes the extension previously done. You can also use the vaWallExtend commnad to trim off the part of the wall that goes beyond that roof/polysurface.

On the other hand, we need the 3dm file to determine the reason why that other wall disappears after the extension. Check out the Absolute tolerance of your Document Units settings, in case you have a too tiny value.

Thanks Francesc!