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Belt printer: bring back the raw G-code view in the canvas view menu

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The "Show raw G-code (belt only)" toggle, retired in #16236, returns as
an item of the Preview canvas view menu (with its B shortcut), and only
there: no legend checkbox.  Unlit, the preview shows the designed,
upright view; lit, the raw machine-frame G-code, which is what to look
at when checking the machine frame transforms.  The toggle is view
only; exported G-code is the same either way.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
This commit is contained in:
harrierpigeon
2026-10-07 01:43:56 -05:00
co-authored by Claude Fable 5.1
parent ef3c47135f
commit e34f4aa0e5
9 changed files with 74 additions and 8 deletions
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src/slic3r/GUI/GCodeViewer.cpp
+14 -7
View File
@@ -1387,7 +1387,11 @@ void GCodeViewer::load_as_gcode(const GCodeProcessorResult& gcode_result, const
m_viewer.set_dim_previous_layers_brightness(0.01f * std::stoi(get_app_config()->get("preview_dim_previous_layers_brightness")));
// avoid processing if called with the same gcode_result.
if (m_last_result_id == gcode_result.id && wxGetApp().is_editor()) {
// On a belt printer the toolpath geometry fed to libvgcode also depends on the
// designed/raw view state (the back-transform is applied in convert), so the
// same result is converted again only when that view has been toggled.
const bool same_belt_view = !m_belt_view_enabled || m_last_belt_show_designed == m_belt_show_designed;
if (m_last_result_id == gcode_result.id && wxGetApp().is_editor() && same_belt_view) {
//BBS: add logs
BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << boost::format(": the same id %1%, return directly, result %2% ") % m_last_result_id % (&gcode_result);
@@ -1429,20 +1433,22 @@ void GCodeViewer::load_as_gcode(const GCodeProcessorResult& gcode_result, const
}
// convert data from PrusaSlicer format to libvgcode format.
// Belt printers: back-transform the toolpath geometry into model/Cartesian
// space using the general belt inverse (handles the mesh rotation, shear and
// axis remap), so the part is shown upright, the way it was designed.
// Belt printers: when the designed (upright) view is active, back-transform
// the toolpath geometry into model/Cartesian space using the general belt
// inverse (handles the mesh rotation, shear and axis remap). When off, the
// raw machine-frame G-code is shown (useful for checking the transform itself).
const bool is_belt = m_belt_view_enabled && print.config().belt_printer.value;
Transform3d belt_inv = is_belt ? compute_belt_back_transform(print.config()) : Transform3d::Identity();
Transform3d belt_inv = (is_belt && m_belt_show_designed)
? compute_belt_back_transform(print.config()) : Transform3d::Identity();
// Belt: move positions are stored as gcode_Z + belt_z_origin (the start G-code's
// purge-blob advance baked into the machine-Z origin by its G92 Z0 resets). Subtract
// that constant before the linear back-transform so every toolpath maps to the model's
// belt coordinate. Without it the back-transform mixes the offset with the gantry-Y
// term, leaving a per-move designed-Y error that min-corner anchoring cannot remove
// when a bridge/keel move happens to cancel it at the bbox minimum.
if (is_belt && gcode_result.belt_z_origin != 0.0f)
if (is_belt && m_belt_show_designed && gcode_result.belt_z_origin != 0.0f)
belt_inv = belt_inv * Transform3d(Eigen::Translation3d(Vec3d(0.0, 0.0, -double(gcode_result.belt_z_origin))));
const bool apply_belt = is_belt
const bool apply_belt = is_belt && m_belt_show_designed
&& !belt_inv.matrix().isApprox(Transform3d::Identity().matrix());
if (apply_belt) {
// The linear belt back-transform recovers the print's shape and orientation but not
@@ -1679,6 +1685,7 @@ void GCodeViewer::load_as_gcode(const GCodeProcessorResult& gcode_result, const
//BBS: move the id to the end of reset
m_last_result_id = gcode_result.id;
m_last_belt_show_designed = m_belt_show_designed;
m_gcode_result = &gcode_result;
m_move_type_counts.fill(0);
for (auto& move_type_times : m_move_type_times)