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Fix for emboss from exactly -Z direction

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This commit is contained in:
Filip Sykala - NTB T15p 2022-07-26 09:15:10 +02:00
parent 8396b13902
commit 5558523b19
1 changed files with 11 additions and 3 deletions
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14
src/libslic3r/Emboss.cpp
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@ -882,9 +882,17 @@ Transform3d Emboss::create_transformation_onto_surface(const Vec3f &position,
wanted_up_dir.normalize();
// perpendicular to emboss vector of text and normal
Vec3d axis_view = text_emboss_dir.cross(wanted_emboss_dir);
double angle_view = std::acos(text_emboss_dir.dot(wanted_emboss_dir)); // in rad
axis_view.normalize();
Vec3d axis_view;
double angle_view;
if (wanted_emboss_dir == -Vec3d::UnitZ()) {
// text_emboss_dir has opposit direction to wanted_emboss_dir
axis_view = Vec3d::UnitY();
angle_view = M_PI;
} else {
axis_view = text_emboss_dir.cross(wanted_emboss_dir);
angle_view = std::acos(text_emboss_dir.dot(wanted_emboss_dir)); // in rad
axis_view.normalize();
}
Eigen::AngleAxis view_rot(angle_view, axis_view);
Vec3d wanterd_up_rotated = view_rot.matrix().inverse() * wanted_up_dir;