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Remove faces in in QuickHull::build() that we don't need anymore 

We delete the faces for consideration in this loop but we can still
sometimes find an edge that connects to this face. We now interate over
all edges and disconnect edges connecting to this face.

This fixes #16560 and fixes #17569
This commit is contained in:
Hein-Pieter van Braam 2018-08-20 00:22:47 +02:00
parent 968b31e971
commit 33669a8bca
1 changed files with 9 additions and 2 deletions
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11
core/math/quick_hull.cpp
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@ -397,7 +397,6 @@ Error QuickHull::build(const Vector<Vector3> &p_points, Geometry::MeshData &r_me
Map<Edge, RetFaceConnect>::Element *F = ret_edges.find(e);
ERR_CONTINUE(!F);
List<Geometry::MeshData::Face>::Element *O = F->get().left == E ? F->get().right : F->get().left;
ERR_CONTINUE(O == E);
ERR_CONTINUE(O == NULL);
@ -426,7 +425,6 @@ Error QuickHull::build(const Vector<Vector3> &p_points, Geometry::MeshData &r_me
Edge e2(idx, idxn);
Map<Edge, RetFaceConnect>::Element *F2 = ret_edges.find(e2);
ERR_CONTINUE(!F2);
//change faceconnect, point to this face instead
if (F2->get().left == O)
@ -439,6 +437,15 @@ Error QuickHull::build(const Vector<Vector3> &p_points, Geometry::MeshData &r_me
}
}
// remove all edge connections to this face
for (Map<Edge, RetFaceConnect>::Element *E = ret_edges.front(); E; E = E->next()) {
if (E->get().left == O)
E->get().left = NULL;
if (E->get().right == O)
E->get().right = NULL;
}
ret_edges.erase(F); //remove the edge
ret_faces.erase(O); //remove the face
}