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Belt printer: supports reach the belt under a leading overhang

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The slicing frame of a belt object started at its lowest vertex, but the
belt under the leading end of an overhang lies below that, by the
overhang's length times the tilt's shear.  Every support generator works
in layers at z >= 0, so none of them could reach it: normal supports
stopped at the object's own lowest layer, and the two tree generators
each carried a stack of hacks to extend themselves below it (a post-hoc
copy of the lowest base area in TreeSupport, "virtual belt raft layers"
in TreeSupport3D/TreeModelVolumes), sized from the pre-rotation bbox
and capped at global z = 0, which is only right for the trailing half
of the belt.

Start the frame at the lowest belt-floor point under the footprint
instead, less a 10 mm margin along the belt for the base of a support
column (BeltSliceStrategy::apply_preslice_transforms and
BeltTransformPipeline::compute_belt_height_and_floor agree on it).  The
layers between it and the first vertex come out empty, which belt
slicing already tolerates, and the generators need no extension at all:

- normal supports: the generator anchors its layer grid at the frame
  origin, so run it in the object frame and shift the global belt Z
  offset onto the result afterwards, as organic supports already did.
  With the offset on the object layers a top contact at negative z
  turned the intermediate-layer count negative and the generator
  allocated layers until the kernel killed it (any overhang in the
  leading half of the belt).  Drop the first-layer flange expansion on a
  belt: the first support layer is the leading tip of the support, not
  a flange, and inflating it put lines in the air ahead of the belt.
- classic tree: a node now keeps dropping until its whole circle is in
  the belt, so the branch tapers to a tip on the belt instead of
  stopping, a radius above it, when its centre crosses.
- organic: the belt is no longer a support blocker.  A blocker is a
  collision, and a branch descending onto one slides off it, down the
  tilted belt and ahead of the part; the belt is where branches end,
  which the per-layer m_belt_floor clipping already does.

The belt brim is generated after the parallel support step instead of
inside it: belt_brim_obstacles() reads every object's layers and support
layers, which another object's support step rebuilds (and, now, shifts)
at the same time.  This is the race behind the Windows arm64 segfault
in "Belt brim of each object precedes its perimeters on its own
filament".

Also: the belt tilt axis moves to Developer mode as its own row (a
shared line is shown by its first option's mode), first_layer_plane
band thickness, belt_support_floor_mode, belt_preslice_global and
gcode_back_transform are retired and presumed on, the gravity arrow is
a plain line along the up direction, and the "Show raw G-code (belt
only)" preview toggle is gone.

Regression test: "Belt supports reach the belt under a leading
overhang" slices a cube with a fin whose underside is parallel to the
layers, 20 mm ahead of the cube and up to 41 mm of slicing Z above the
belt, for normal, organic and classic tree supports, and checks that
the lowest support layer sits on the belt beneath its own lines.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
This commit is contained in:
harrierpigeon
2026-10-06 22:14:25 -05:00
co-authored by Claude Fable 5.1
parent 8039d4d2ac
commit dda58b07cd
37 changed files with 412 additions and 618 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/libslic3r/PrintConfig.cpp
+6 -58
View File
@@ -398,12 +398,6 @@ static t_config_enum_values s_keys_map_RemapAxis {
};
CONFIG_OPTION_ENUM_DEFINE_STATIC_MAPS(RemapAxis)
static t_config_enum_values s_keys_map_BeltSupportFloorMode {
{ "none", int(BeltSupportFloorMode::None) },
{ "generator_only", int(BeltSupportFloorMode::GeneratorOnly) },
};
CONFIG_OPTION_ENUM_DEFINE_STATIC_MAPS(BeltSupportFloorMode)
static t_config_enum_values s_keys_map_SupportMaterialPattern {
{ "rectilinear", smpRectilinear },
{ "rectilinear-grid", smpRectilinearGrid },
@@ -7390,7 +7384,7 @@ void PrintConfigDef::init_fff_params()
def->enum_keys_map = &ConfigOptionEnum<BeltRotationAxis>::get_enum_values();
def->enum_values = {"none", "x", "y", "z"};
def->enum_labels = {L("None"), L("X"), L("Y"), L("Z")};
def->mode = comAdvanced;
def->mode = comDevelop;
def->set_default_value(new ConfigOptionEnum<BeltRotationAxis>(BeltRotationAxis::X));
def = this->add("belt_slice_rotation_angle", coFloat);
@@ -7451,38 +7445,6 @@ void PrintConfigDef::init_fff_params()
// by per-axis keys: it is derived from the belt tilt (belt_slice_rotation axis
// + angle, or belt_frame_tilt_angle when decoupled) in MachineFrameTransform.
def = this->add("gcode_back_transform", coBool);
def->label = L("G-code back-transform");
def->category = L("Printable space");
def->tooltip = L("Undo the pre-slice mesh transform before applying the G-code axis remap "
"and machine-frame shear/scale. Required for the standard belt-printer "
"rotation pipeline.");
def->mode = comExpert;
def->set_default_value(new ConfigOptionBool(true));
def = this->add("belt_preslice_global", coBool);
def->label = L("Global mesh transforms");
def->category = L("Printable space");
def->tooltip = L("When enabled, pre-slice belt transforms (remap, shear, scale) account for "
"each object's bed position, producing correct machine coordinates without "
"relying on origin snap. Each instance gets its own PrintObject.");
def->mode = comExpert;
def->set_default_value(new ConfigOptionBool(true));
def = this->add("first_layer_plane_thickness", coFloat);
def->label = L("First layer band thickness");
def->category = L("Printable space");
def->tooltip = L("Belt printers only. Every tilted layer touches the belt, so the first-layer "
"settings apply to a band above the belt surface rather than to the first "
"slicing layer. This is the thickness of one band, in mm: the unit by which "
"'No cooling for the first N layers' and similar layer-count thresholds are "
"multiplied. -1 means use the first layer height.");
def->sidetext = L("mm");
def->min = -1;
def->max = 100;
def->mode = comAdvanced;
def->set_default_value(new ConfigOptionFloat(-1.0));
// Belt support floor debug controls
def = this->add("belt_support_floor_offset", coFloat);
def->label = L("Support Floor Z offset");
@@ -7494,19 +7456,6 @@ void PrintConfigDef::init_fff_params()
def->mode = comAdvanced;
def->set_default_value(new ConfigOptionFloat(0));
{
auto def = this->add("belt_support_floor_mode", coEnum);
def->label = L("Floor mode");
def->category = L("Printable space");
def->tooltip = L("Controls belt floor awareness for supports. 'None' disables belt floor logic. "
"'Generator only' stops support generation at the belt floor plane.");
def->enum_keys_map = &ConfigOptionEnum<BeltSupportFloorMode>::get_enum_values();
def->enum_values = {"none", "generator_only"};
def->enum_labels = {L("None"), L("Generator only")};
def->mode = comDevelop;
def->set_default_value(new ConfigOptionEnum<BeltSupportFloorMode>(BeltSupportFloorMode::GeneratorOnly));
}
def = this->add("enable_belt_purge_tower", coBool);
def->label = L("Enable belt purge tower");
def->category = L("Multimaterial");
@@ -9440,9 +9389,6 @@ void PrintConfigDef::handle_legacy(t_config_option_key &opt_key, std::string &va
//BBS: handle legacy options
if (opt_key == "curr_bed_type" && value == "SuperTack Plate") {
value = "Supertack Plate";
} else if (opt_key == "belt_support_floor_mode" && (value == "clip_only" || value == "both")) {
// Never implemented; both behaved like "none".
value = "none";
} else if (opt_key == "enable_wipe_tower") {
opt_key = "enable_prime_tower";
} else if (opt_key == "wipe_tower_width") {
@@ -9682,11 +9628,13 @@ void PrintConfigDef::handle_legacy(t_config_option_key &opt_key, std::string &va
"smooth_coefficient", "overhang_totally_speed", "silent_mode",
"overhang_speed_classic",
"anisotropic_surfaces", // superseded by top_surface_fill_order / bottom_surface_fill_order
// Belt printer keys retired before the first release: the global switches collapsed
// into belt_preslice_global, the pre-slice axis remap and the support Z offset mode
// were removed.
// Belt printer keys retired before the first release: the global-mode and
// back-transform switches are presumed on, and the pre-slice axis remap, the
// support Z offset mode, the support floor mode (always on) and the first-layer
// plane evaluator were removed.
"belt_slice_rotation_global", "preslice_remap_x", "preslice_remap_y", "preslice_remap_z", "preslice_remap_global",
"belt_support_z_offset_mode", "first_layer_plane", "first_layer_plane_offset",
"belt_preslice_global", "gcode_back_transform", "belt_support_floor_mode", "first_layer_plane_thickness",
};
if (ignore.find(opt_key) != ignore.end()) {