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Bugfix: incomplete slicing when more than two facets shared the same edge. #1483

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This commit is contained in:
Alessandro Ranellucci 2013-10-26 14:43:47 +02:00
parent 5988f14b14
commit e6efda4ba4
1 changed files with 17 additions and 9 deletions
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26
xs/src/TriangleMesh.cpp
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@ -212,13 +212,22 @@ TriangleMesh::slice(const std::vector<double> &z)
int edge_idx;
t_edges_map::const_iterator my_edge = edges_map.find(std::make_pair(b_id,a_id));
if (my_edge == edges_map.end()) {
// edge isn't listed in table, so we insert it
edge_idx = edges.size();
edges.push_back(std::make_pair(a_id,b_id));
edges_map[ edges[edge_idx] ] = edge_idx;
} else {
if (my_edge != edges_map.end()) {
edge_idx = my_edge->second;
} else {
/* admesh can assign the same edge ID to more than two facets (which is
still topologically correct), so we have to search for a duplicate of
this edge too in case it was already seen in this orientation */
my_edge = edges_map.find(std::make_pair(a_id,b_id));
if (my_edge != edges_map.end()) {
edge_idx = my_edge->second;
} else {
// edge isn't listed in table, so we insert it
edge_idx = edges.size();
edges.push_back(std::make_pair(a_id,b_id));
edges_map[ edges[edge_idx] ] = edge_idx;
}
}
facets_edges[facet_idx][i] = edge_idx;
@ -262,7 +271,7 @@ TriangleMesh::slice(const std::vector<double> &z)
std::vector<double>::size_type layer_idx = it - z.begin();
double slice_z = *it;
std::vector<IntersectionPoint> points;
std::vector< std::vector<IntersectionPoint>::size_type > points_on_layer, intersection_points;
std::vector< std::vector<IntersectionPoint>::size_type > points_on_layer;
bool found_horizontal_edge = false;
/* reorder vertices so that the first one is the one with lowest Z
@ -328,7 +337,6 @@ TriangleMesh::slice(const std::vector<double> &z)
point.y = b->y + (a->y - b->y) * (slice_z - b->z) / (a->z - b->z);
point.edge_id = edge_id;
points.push_back(point);
intersection_points.push_back(points.size()-1);
}
}
if (found_horizontal_edge) continue;
@ -339,8 +347,8 @@ TriangleMesh::slice(const std::vector<double> &z)
// we assume this code is not getting called for horizontal facets
assert(points_on_layer.size() == 2);
assert( points[ points_on_layer[0] ].point_id == points[ points_on_layer[1] ].point_id );
if (points.size() < 3) continue; // no intersection point, this is a V-shaped facet tangent to plane
points.erase( points.begin() + points_on_layer[1] );
if (intersection_points.empty()) continue;
}
if (!points.empty()) {