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ENH: Port of "wipe inside before extruding an external perimeter" feature from super slicer (#3287)

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* Wipe Inside at Start of perimeter

Co-Authored-By: Merill <6536403+supermerill@users.noreply.github.com>

* Cleaned up code and linked it to the wipe on loop parameter

* Trigger build

* Introduced wipe before external loop parameter.

* Removed redundant functions

---------

Co-authored-by: Merill <6536403+supermerill@users.noreply.github.com>
Co-authored-by: SoftFever <softfeverever@gmail.com>
This commit is contained in:
Ioannis Giannakas 2023-12-27 11:21:33 +00:00 • committed by GitHub
parent 90dd67e4e4
commit 7ab2fabe6a
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5 changed files with 61 additions and 1 deletions
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52
src/libslic3r/GCode.cpp
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@ -4437,6 +4437,58 @@ std::string GCode::extrude_loop(ExtrusionLoop loop, std::string description, dou
// extrude along the path
std::string gcode;
// Port of "wipe inside before extruding an external perimeter" feature from super slicer
if (m_config.wipe_before_external_loop.value && !paths.empty() && paths.front().size() > 1 && paths.back().size() > 1 && paths.front().role() == erExternalPerimeter) {
const bool is_full_loop_ccw = loop.polygon().is_counter_clockwise();
bool is_hole_loop = (loop.loop_role() & ExtrusionLoopRole::elrHole) != 0; // loop.make_counter_clockwise();
const double nozzle_diam = EXTRUDER_CONFIG(nozzle_diameter);
// note: previous & next are inverted to extrude "in the opposite direction, and we are "rewinding"
Point previous_point = paths.front().polyline.points[1];
Point current_point = paths.front().polyline.points.front();
Point next_point = paths.back().polyline.points.back();
// can happen if seam_gap is null
if (next_point == current_point) {
next_point = paths.back().polyline.points[paths.back().polyline.points.size() - 2];
}
Point a = next_point; // second point
Point b = previous_point; // second to last point
if ((is_hole_loop ? !is_full_loop_ccw : is_full_loop_ccw)) {
// swap points
std::swap(a, b);
}
double angle = current_point.ccw_angle(a, b) / 3;
// turn outwards if contour, turn inwwards if hole
if (is_hole_loop ? !is_full_loop_ccw : is_full_loop_ccw) angle *= -1;
Vec2d current_pos = current_point.cast<double>();
Vec2d next_pos = next_point.cast<double>();
Vec2d vec_dist = next_pos - current_pos;
double vec_norm = vec_dist.norm();
// Offset distance is the minimum between half the nozzle diameter or half the line width for the upcomming perimeter
// This is to mimimize potential instances where the de-retraction is performed on top of a neighbouring
// thin perimeter due to arachne reducing line width.
coordf_t dist = std::min(scaled(nozzle_diam) * 0.5, scaled(paths.front().width) * 0.5);
// FIXME Hiding the seams will not work nicely for very densely discretized contours!
Point pt = (current_pos + vec_dist * (2 * dist / vec_norm)).cast<coord_t>();
pt.rotate(angle, current_point);
pt = (current_pos + vec_dist * (2 * dist / vec_norm)).cast<coord_t>();
pt.rotate(angle, current_point);
// use extrude instead of travel_to_xy to trigger the unretract
ExtrusionPath fake_path_wipe(Polyline{pt, current_point}, paths.front());
fake_path_wipe.mm3_per_mm = 0;
gcode += extrude_path(fake_path_wipe, "move inwards before retraction/seam", speed);
}
bool is_small_peri = false;
for (ExtrusionPaths::iterator path = paths.begin(); path != paths.end(); ++path) {
// description += ExtrusionLoop::role_to_string(loop.loop_role());