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Andy · 23rd July 2015, 05:58 AM

From looking at your result in AC3D, it appears that some of your surfaces are facing the wrong way.

I can tell this by setting all surfaces to 1S (single -sided) and looking around the object. If surfaces 'disappear' then they are the wrong way around.

For booleans to have any chance of working, you need to get all normals facing outwards on all objects used.

To fix the original, select one surface (that you know is facing correctly), and use Surface->Unify-normals.

23rd July 2015, 05:58 AM	#7
Andy Administrator Professional user Join Date: Jun 2003 Posts: 4,565	Re: Holes in Objects From looking at your result in AC3D, it appears that some of your surfaces are facing the wrong way. I can tell this by setting all surfaces to 1S (single -sided) and looking around the object. If surfaces 'disappear' then they are the wrong way around. For booleans to have any chance of working, you need to get all normals facing outwards on all objects used. To fix the original, select one surface (that you know is facing correctly), and use Surface->Unify-normals.