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Add belt printer transform pipeline: slicing rotation, G-code coords, preview

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- Implement core belt slicing pipeline: R(-alpha, X) mesh rotation in PrintObjectSlice with corrected object height calculation for proper layer count
Add to_machine_coords() in GCodeWriter to convert slicing-frame coordinates back to machine-frame, propagated through GCode,
GCodeProcessor, and GCodeViewer
Add belt-mode UI: tilted bed visualization, slicing-direction arrow, and raw G-code toggle to switch between machine-frame and slicing-frame views

This is a combination of 6 commits.

checkpoint 1: initial MVP.  Slicing functions, but rotates instead of skews are happening and a lot of other stuff too

getting somewhere, getting to the point where I need to figure out how to verify this stuff

this appears to be a dead end.

getting somewhere I think maybe

I'm pretty sure we've completely lost the plot at this point and need to restart this process...

remove slice logic in preparation for new, more invasive plan
This commit is contained in:
harrierpigeon
2026-03-11 03:58:52 -05:00
committed by Joseph Robertson
parent 08aa277974
commit ed6ea086a2
22 changed files with 375 additions and 31 deletions
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25
src/libslic3r/BuildVolume.cpp
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@@ -176,6 +176,26 @@ BuildVolume::BuildVolume(const std::vector<Vec2d> &printable_area, const double
BOOST_LOG_TRIVIAL(debug) << "BuildVolume printable_area clasified as: " << this->type_name();
}
void BuildVolume::set_belt_printer(bool enabled, double angle_deg, bool infinite_y)
{
m_is_belt_printer = enabled;
m_belt_angle = angle_deg;
m_belt_infinite_y = infinite_y;
if (enabled) {
if (infinite_y) {
// Extend the Y bound to a very large value for infinite belt.
m_bboxf.max.y() = 100000.;
}
// Adjust max print height to diagonal reach: printable_height / sin(belt_angle).
if (angle_deg > 0. && angle_deg < 90.) {
double sin_a = std::sin(angle_deg * M_PI / 180.0);
if (sin_a > 0.)
m_bboxf.max.z() = m_max_print_height / sin_a;
}
}
}
#if 0
// Tests intersections of projected triangles, not just their vertices against a bounding box.
// This test also correctly evaluates collision of a non-convex object with the bounding box.
@@ -384,6 +404,11 @@ BuildVolume::ObjectState BuildVolume::object_state(const indexed_triangle_set& i
build_volume.max.z() = std::numeric_limits<double>::max();
if (ignore_bottom)
build_volume.min.z() = -std::numeric_limits<double>::max();
// Belt printer: extend Y bounds for infinite Y.
if (m_is_belt_printer && m_belt_infinite_y) {
build_volume.min.y() = -std::numeric_limits<double>::max();
build_volume.max.y() = std::numeric_limits<double>::max();
}
BoundingBox3Base<Vec3f> build_volumef(build_volume.min.cast<float>(), build_volume.max.cast<float>());
// The following test correctly interprets intersection of a non-convex object with a rectangular build volume.
//return rectangle_test(its, trafo, to_2d(build_volume.min), to_2d(build_volume.max), build_volume.max.z());