Sorry, I didn't recognize it. When starting drawing the walls the middle seems to be at the end of the wall. When grouping the walls this point changes. I guess that's the reason why I run into trouble. Is there any option to configure a different handling of this point in the middle?

I just noticed that this problem occurs when you connect 2 or more walls. When I create a single wall it fits to the size of the background image. But if I create a second wall and combine them the value inside the distance field shrinks. For example: Wall without connection = 888 cm. Wall with ...

Thanks for the answer: I scaled it again to 888 / 863 because the CAD drawing contains the walls. It did not help. Then I changed it to 863 / 845 but nothing is changing. The result is still the same. The background image is smaller than the manually created walls but the settings of the walls shows ...

Dear all,
I want to create a 3D model of a house. I've got a CAD plan which was exported to PDF. I want to use it as background image to draw the walls. Therefore I exported it to .png using GIMP.

During import dialog there is just one line which can be used to specify the size of a wall inside the ...