To make irregular ceilings or background walls, there are two methods:

Method 1: Draw the shape well in CAD and import it to the ceiling and wall;

1.  Note: CAD must meet two conditions at the same time: Condition 1. It can only be a polyline, that is, the line drawn by the PL command; Condition 2. The dxf format of the 2007 version of cad;

2. After drawing the shape, enter the ceiling and wall, left-click the wall/ceiling to enter the shaping interface;

3. Right-click the white area, select "Import Shape" - "Local Area", and modify the distance from the wall/ceiling.

Method 2: Draw the shape well with polylines, right-click to convert to an area, and modify the distance from the wall/ceiling.