3DPrinting/PrusaSlicer-NonPlainar
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TriangleSelector: bugfix - backend did not correctly account for mirrorring

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This commit is contained in:
Lukas Matena 2020-07-23 08:17:04 +02:00
parent 5a1d9aee15
commit 74a1aeff8e
1 changed files with 4 additions and 3 deletions
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7
src/libslic3r/PrintObject.cpp
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@ -2677,10 +2677,10 @@ void PrintObject::project_and_append_custom_supports(
if (custom_facets.indices.empty())
continue;
const TriangleMesh& mesh = mv->mesh();
const Transform3f& tr1 = mv->get_matrix().cast<float>();
const Transform3f& tr2 = this->trafo().cast<float>();
const Transform3f tr = tr2 * tr1;
const float tr_det_sign = (tr.matrix().determinant() > 0. ? 1.f : -1.f);
// The projection will be at most a pentagon. Let's minimize heap
@ -2719,8 +2719,9 @@ void PrintObject::project_and_append_custom_supports(
for (int i=0; i<3; ++i)
facet[i] = tr * custom_facets.vertices[custom_facets.indices[idx](i)];
// Ignore triangles with upward-pointing normal.
if ((facet[1]-facet[0]).cross(facet[2]-facet[0]).z() > 0.)
// Ignore triangles with upward-pointing normal. Don't forget about mirroring.
float z_comp = (facet[1]-facet[0]).cross(facet[2]-facet[0]).z();
if (tr_det_sign * z_comp > 0.)
continue;
// Sort the three vertices according to z-coordinate.