Comments (3)
@pca006132 After thinking about this for quite a while, I think it's going to be pretty difficult, algorithmically, to make negative objects work intuitively with Boolean operations. After all, they do work now (they're manifold), they're just surprising, as with overlapping manifolds. I think the better approach is to follow what we're already doing in 2D: make all Manifolds non-overlapping.
Of course, I haven't yet made an algorithm to remove overlaps from a Manifold, but I plan to. When that happens, negative volume objects will also be removed, due to the positive fill rule. So I think our best stepping-stone for now is to detect and remove negative-volume meshes as a Manifold is constructed. This leaves the question of how to handle Decompose
.
We could remove the vugs from the output, which might be confusing. We could invert them, so they become positive volume objects in their own right. Or we could just ignore all of this and put in the documentation that negative volume meshes are not epsilon-valid, so it's up to you to avoid them, just like self-intersecting meshes.
What do you think?
from manifold.
So I think our best stepping-stone for now is to detect and remove negative-volume meshes as a Manifold is constructed. This leaves the question of how to handle
Decompose
.
Agreed. I am more inclined towards subtracting the vugs from the output volumes (which is just composing them if they intersect?), this matches my intuition about how the objects are defined (the holes are part of the enclosing object) and how Decompose
should work (holes should be kept).
from manifold.
That's a good point, and IIRC our 2D decompose already acts that way. Sounds like a good approach.
from manifold.
Related Issues (20)
- Wrong pkg-config package name for Clipper2 dependency HOT 2
- Python created object reports as non-manifold. HOT 3
- Watertightness of Mesh with an Edge Shared by 4 Faces
- vertex halfedge iterator
- Manifold 2.4.5 release tar.gz is incomplete HOT 3
- Vec out of Range HOT 8
- Python binding needs two import call HOT 4
- Manifold Decompose doesn't preserve vertex properties HOT 4
- memory leak when TBB and PSTL is enabled HOT 27
- Triangulate bug: Two separate polygons HOT 5
- [Question] robust geometric predicates, polygon triangulation
- Warning comparison of integer expressions of different signedness
- Modularize Manifold HOT 17
- Build without exceptions HOT 1
- Remove Thrust HOT 19
- How to figure out required size of mem in the C-API? HOT 1
- Crash in Project() HOT 4
- gcc14 build failure HOT 7
- Triangulation issue: Zebra HOT 3
- BSD compiler error HOT 1
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from manifold.