ok what is goin on exactly when booleans make geometry dissappear?

there are some multiple reasons.


conditions to make successful boolean


1) first of all - allways make sure you have no nonmanifold geomtry where you want to apply a boolean operation onto.

2) both geometries must be closed meshes. and with closed i mean really watertight.

3) conform distribution of normals on the surface. all normals of both geometries must point outwards or inwards at the same time.


basically that´s it. there are no more situations where you can run into a boolean problem. non-manifold/closed mesh/normals


use your scripteditor a lot. SE tells you most times which vertices to select (coz when they cause non-manifoldness).


sometimes when i have a very big geometry I break it into smaller peaces and convert them into subdivs and back to poly to find the spot that is screwed up. converting polys to subdiv doesnt work either when above conditions aren´t met.

hope that helped!


edit:

ah, and clean blindNodes in the hypergraph which you dont use anymore.