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FIX: sequential_print_clearance_valid may crash due to clipper's bug

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offset may give empty results.

Jira: STUDIO-2452
Change-Id: I4da9689dc3e22afcb2340ce0f9956237e4aab434
(cherry picked from commit 3f33979a79c720fcaddb5b850ec278b3deaf2417)
This commit is contained in:
Arthur 2023-03-10 20:14:42 +08:00 • committed by Lane.Wei
parent c098e01b22
commit f227a8f8da
1 changed files with 8 additions and 5 deletions
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13
src/libslic3r/Print.cpp
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@ -460,14 +460,17 @@ StringObjectException Print::sequential_print_clearance_valid(const Print &print
// Now we check that no instance of convex_hull intersects any of the previously checked object instances.
for (const PrintInstance &instance : print_object->instances()) {
Polygon convex_hull_no_offset = convex_hull0, convex_hull;
convex_hull = offset(convex_hull_no_offset,
auto tmp = offset(convex_hull_no_offset,
// Shrink the extruder_clearance_radius a tiny bit, so that if the object arrangement algorithm placed the objects
// exactly by satisfying the extruder_clearance_radius, this test will not trigger collision.
float(scale_(0.5 * print.config().extruder_clearance_max_radius.value - EPSILON)),
jtRound, scale_(0.1)).front();
// instance.shift is a position of a centered object, while model object may not be centered.
// Convert the shift from the PrintObject's coordinates into ModelObject's coordinates by removing the centering offset.
convex_hull.translate(instance.shift - print_object->center_offset());
jtRound, scale_(0.1));
if (!tmp.empty()) { // tmp may be empty due to clipper's bug, see STUDIO-2452
convex_hull = tmp.front();
// instance.shift is a position of a centered object, while model object may not be centered.
// Convert the shift from the PrintObject's coordinates into ModelObject's coordinates by removing the centering offset.
convex_hull.translate(instance.shift - print_object->center_offset());
}
convex_hull_no_offset.translate(instance.shift - print_object->center_offset());
//juedge the exclude area
if (!intersection(exclude_polys, convex_hull_no_offset).empty()) {