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Part 2.7: Add G-code back-transform and tree support belt floor clipping

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- Add BeltBackTransform class that inverts the shear/scale matrix and
  applies it in GCodeWriter::to_machine_coords() so G-code outputs in
  the machine's physical coordinate space, gated by new
  belt_gcode_back_transform config option
- Extend belt floor clipping to all three tree support pipelines
  (Prusa-style, Orca organic, TreeModelVolumes) with per-layer polygon
  clipping, anti-overhang integration, and belt raft extension layers
- Fix tree drop_nodes() belt termination, organic support global Z
  offset, collision calculation index bug, and first-layer brim/empty
  layer checks for belt printers

two-shot - first build built but didn't plumb to UI.  Woah.

add pre-slice axis remap, because Y needs to be Z

going to change tactic and move based on bbox min

switch to per axis snapping

per axis swap snap now per object

build plate tilt wasn't invalidating slicer settings

support upper bound now correct, need to get lower bound corrected

axis swapped support termination corrected

Z Shear works with and without pre-slice remap now
This commit is contained in:
harrierpigeon
2026-04-09 23:07:07 -05:00
parent ea5c6776b3
commit 9bbac19de4
20 changed files with 767 additions and 36 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/libslic3r/GCodeWriter.cpp
+27 -5
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@@ -37,18 +37,40 @@ void GCodeWriter::set_build_volume_max(const Vec3d &max)
m_build_vol_max = max;
}
void GCodeWriter::set_belt_back_transform(const PrintConfig &config)
{
m_belt_back_transform.init_from_config(config);
}
void GCodeWriter::set_origin_snap(int axis, bool enable, double offset, double bbox_min)
{
if (axis >= 0 && axis < 3) {
m_origin_snap[axis] = enable;
m_origin_offset[axis] = offset;
m_origin_bbox_min[axis] = bbox_min;
}
}
Vec3d GCodeWriter::to_machine_coords(const Vec3d &pos) const
{
if (!is_belt_printer())
return pos;
// Step 1: Undo the shear/scale applied during slicing.
Vec3d p = m_belt_back_transform.apply(pos);
// Step 2: Apply axis remapping for the machine's coordinate convention.
// BeltRemapAxis: 0-2 = +X/+Y/+Z, 3-5 = -X/-Y/-Z, 6-8 = Rev X/Y/Z
auto remap = [this, &pos](int r) -> double {
auto remap = [this, &p](int r) -> double {
int axis = r % 3;
if (r < 3) return pos[axis];
if (r < 6) return -pos[axis];
return m_build_vol_max[axis] - pos[axis];
if (r < 3) return p[axis];
if (r < 6) return -p[axis];
return m_build_vol_max[axis] - p[axis];
};
return { remap(m_remap_x), remap(m_remap_y), remap(m_remap_z) };
Vec3d result = { remap(m_remap_x), remap(m_remap_y), remap(m_remap_z) };
// Per-axis origin snap: shift so bbox min on each enabled axis = offset.
for (int i = 0; i < 3; ++i)
if (m_origin_snap[i])
result[i] -= (m_origin_bbox_min[i] - m_origin_offset[i]);
return result;
}
bool GCodeWriter::supports_separate_travel_acceleration(GCodeFlavor flavor)