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Part 2.5: Add global shear transform, support clipping, and belt UI improvements

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- Implement per-object global shear transform in PrintObject with
  layer Z-offset calculation, config invalidation, and fix for
  shared-object layer optimization breaking copied objects
- Clip support layers to the transformed belt floor plane and begin
  work on tree support adaptation for sheared coordinate space
- Improve belt UI: gray out inactive sub-options, add B keyboard
  shortcut for G-code viewer design-view toggle, fix mesh clipping
  through build plate after shear/scale transform

y' = y + z·cot(α),
  while x' = x and z' = z

getting closer to customizable variant

getting closer

X/Y/Z shear initial

clean up UI

add 1/sin(a) transform, idea taken from blackbelt cura plugin

Things work now (turns out I've been using the wrong set of  transforms)
This commit is contained in:
harrierpigeon
2026-03-30 13:25:40 -05:00
committed by Joseph Robertson
parent cb13a22e57
commit 719af2d81d
13 changed files with 452 additions and 91 deletions
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src/slic3r/GUI/GCodeViewer.cpp
+12 -10
View File
@@ -1271,7 +1271,7 @@ void GCodeViewer::load_as_gcode(const GCodeProcessorResult& gcode_result, const
m_max_print_height = gcode_result.printable_height;
m_z_offset = gcode_result.z_offset;
m_belt_z_shift = gcode_result.belt_z_shift;
// load_toolpaths(gcode_result, build_volume, exclude_bounding_box);
@@ -2210,15 +2210,17 @@ void GCodeViewer::render_toolpaths()
{
const Camera& camera = wxGetApp().plater()->get_camera();
Matrix4f view = camera.get_view_matrix().matrix().cast<float>();
// Belt "raw" view: apply slicing rotation to view matrix so toolpaths appear
// in the slicing frame (rotated part with horizontal layers).
if (m_belt_show_raw && m_belt_view_enabled && m_belt_angle_deg > 0.f) {
// Belt "designed" view: apply inverse shear to view matrix so toolpaths appear
// upright (as originally designed) instead of sheared on the belt.
if (m_belt_show_designed && m_belt_view_enabled && m_belt_angle_deg > 0.f) {
double angle_rad = Geometry::deg2rad(static_cast<double>(m_belt_angle_deg));
// Apply R(-alpha, X) * T(0,0,-z_shift) to bring machine coords back to slicing frame.
Transform3d slicing_trafo = Transform3d::Identity();
slicing_trafo.translate(Vec3d(0., 0., -static_cast<double>(m_belt_z_shift)));
slicing_trafo = Eigen::AngleAxisd(-angle_rad, Vec3d::UnitX()) * slicing_trafo;
view = (camera.get_view_matrix() * slicing_trafo).matrix().cast<float>();
double sin_a = std::sin(angle_rad);
if (sin_a > 1e-6) {
double cot_alpha = std::cos(angle_rad) / sin_a;
Transform3d inverse_shear = Transform3d::Identity();
inverse_shear.matrix()(1, 2) = -cot_alpha; // Y -= Z * cot(α)
view = (camera.get_view_matrix() * inverse_shear).matrix().cast<float>();
}
}
const libvgcode::Mat4x4 converted_view_matrix = libvgcode::convert(view);
const libvgcode::Mat4x4 converted_projetion_matrix = libvgcode::convert(static_cast<Matrix4f>(camera.get_projection_matrix().matrix().cast<float>()));
@@ -4421,7 +4423,7 @@ void GCodeViewer::render_legend(float &legend_height, int canvas_width, int canv
ImGui::Spacing();
ImGui::Dummy({ window_padding, 0 });
ImGui::SameLine();
ImGui::Checkbox("Show raw G-code (slicing frame)", &m_belt_show_raw);
ImGui::Checkbox("Show designed view (upright)", &m_belt_show_designed);
}
legend_height = ImGui::GetCurrentWindow()->Size.y;