Hi Gord,
> Sometimes though, swept rails just won't boolean into another solid surface, whereas others had
> no problem. See the two rails on his one.
Similar to how it is difficult to intersect a surface that skims right along another surface area it can also be difficult to have skimming edges like you've got here:
Another problem is in this area where you're trying to boolean there are some microstructures:
It will probably be difficult to do a boolean cut that has to try and intersect through that messy area.
> And why, when you boolean does the object sometimes disappear?
Part of the sequence of doing a boolean is it intersects the 2 objects and then needs to gather well formed closed intersection curve results which it then uses to partition objects into different pieces. If it was not able to get a good closed intersection then it can get confused about how to divide pieces up. The pieces that disappear were being classified as being in the volume that is to be discarded. If there are a lot of little tiny fragments in the area that is being intersected they can get partially glommed together and that can impede getting a well formed close intersection.
So it's not good to do repeated booleans of pieces that are kind of close to being aligned but just a little bit off, that can make those little slivery pieces.
- Michael |
