Create a peripheral false ceiling with curved corners using fillet

Draw an inset rectangle on the ceiling, round its corners with the Fillet tool, then set the drop depth and material.

1. To create a peripheral false ceiling: select the ceiling, go to Create False Ceiling, then Add Extrude Shape, draw a rectangle corner to corner and Offset it inward with Copy by the band's width. The rectangle alone gives one filled shape over the whole ceiling.

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2. Use Offset with the Move option to push the rectangle inward by the desired distance (e.g. 600 mm).

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3. To round the corners, use the Fillet tool: set the amount in its preferences ('Edge length reduction': how far back along each of the two lines the arc starts; at a right-angled corner it equals the arc's radius), then pick the two lines that meet at the corner.

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4. Apply, then set the drop depth and assign a material such as veneer or laminate.

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