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Andy · 21st March 2013, 12:02 PM

Art is correct: AC3D is not a solid modeller (like most CAD systems) so booleans will always be a compromise.

If you get a black surface, it usually means that the first three vertices (which are used to calculate the shading normal) are in the wrong order. Try repeatedly using Change-vertex-order on the offending surface until it shows the correct color. You should probably triangulate the surface if it's complicated.

21st March 2013, 12:02 PM	#3
Andy Administrator Professional user Join Date: Jun 2003 Posts: 4,565	Re: Error performing boolean operation Art is correct: AC3D is not a solid modeller (like most CAD systems) so booleans will always be a compromise. If you get a black surface, it usually means that the first three vertices (which are used to calculate the shading normal) are in the wrong order. Try repeatedly using Change-vertex-order on the offending surface until it shows the correct color. You should probably triangulate the surface if it's complicated.