Givin volume to a mesh
 

Hi
Here my problem/question for Lightwave.
I have the problem that sometimes, if I use the boolean subtract, it makes just a hole in the "outer" hull of the previous mesh.
Just an example to imagine : If you subtract a disc from a box, you should have a hole with inner volume, but in my case I sometimes just have the hole, and I can look through the hole to the other end of the mesh. Any ideas how to avoid or repair it?
thx

The problem (I think) is that the polygons that have been made from the subtraction, are flipped the wrong way. Select them and Flip(f key) them. They should show up then.

also booleans can be set to join, intersect or subtract.

No, there are no polygons to flip.