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Improved robustness of stl_fix_normal_directions(stl_file *stl)

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by further C++isation of the legacy C code.
This commit is contained in:
Vojtech Bubnik 2021-02-05 14:54:05 +01:00
parent 828271d016
commit 298097c814
1 changed files with 7 additions and 6 deletions
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13
src/admesh/normals.cpp
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@ -133,16 +133,16 @@ void stl_fix_normal_directions(stl_file *stl)
// Initialize list that keeps track of already fixed facets.
std::vector<char> norm_sw(stl->stats.number_of_facets, 0);
// Initialize list that keeps track of reversed facets.
std::vector<int> reversed_ids(stl->stats.number_of_facets, 0);
std::vector<int> reversed_ids;
reversed_ids.reserve(stl->stats.number_of_facets);
int facet_num = 0;
int reversed_count = 0;
// If normal vector is not within tolerance and backwards:
// Arbitrarily starts at face 0. If this one is wrong, we're screwed. Thankfully, the chances
// of it being wrong randomly are low if most of the triangles are right:
if (check_normal_vector(stl, 0, 0)) {
reverse_facet(stl, 0);
reversed_ids[reversed_count ++] = 0;
reversed_ids.emplace_back(0);
}
// Say that we've fixed this facet:
@ -159,13 +159,13 @@ void stl_fix_normal_directions(stl_file *stl)
if (stl->neighbors_start[facet_num].neighbor[j] != -1) {
if (norm_sw[stl->neighbors_start[facet_num].neighbor[j]] == 1) {
// trying to modify a facet already marked as fixed, revert all changes made until now and exit (fixes: #716, #574, #413, #269, #262, #259, #230, #228, #206)
for (int id = reversed_count - 1; id >= 0; -- id)
for (int id = int(reversed_ids.size()) - 1; id >= 0; -- id)
reverse_facet(stl, reversed_ids[id]);
force_exit = true;
break;
}
reverse_facet(stl, stl->neighbors_start[facet_num].neighbor[j]);
reversed_ids[reversed_count ++] = stl->neighbors_start[facet_num].neighbor[j];
reversed_ids.emplace_back(stl->neighbors_start[facet_num].neighbor[j]);
}
}
// If this edge of the facet is connected:
@ -188,6 +188,7 @@ void stl_fix_normal_directions(stl_file *stl)
// Get next facet to fix from top of list.
if (head->next != tail) {
facet_num = head->next->facet_num;
assert(facet_num < stl->stats.number_of_facets);
if (norm_sw[facet_num] != 1) { // If facet is in list mutiple times
norm_sw[facet_num] = 1; // Record this one as being fixed.
++ checked;
@ -207,7 +208,7 @@ void stl_fix_normal_directions(stl_file *stl)
facet_num = i;
if (check_normal_vector(stl, i, 0)) {
reverse_facet(stl, i);
reversed_ids[reversed_count++] = i;
reversed_ids.emplace_back(i);
}
norm_sw[facet_num] = 1;
++ checked;