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Corrections to math. Threads are not always rectangles with semicircles. Better calculation of overlap.

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This commit is contained in:
Alessandro Ranellucci 2011-12-17 19:52:34 +01:00
parent cd0fd80a69
commit 1e6ecd9eab
13 changed files with 62 additions and 41 deletions
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21
lib/Slic3r/Extruder.pm
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@ -76,7 +76,7 @@ sub extrude_loop {
my $extrusion_path = $loop->split_at($start_at);
# clip the path to avoid the extruder to get exactly on the first point of the loop
$extrusion_path->clip_end(scale $Slic3r::flow_width);
$extrusion_path->clip_end(scale $Slic3r::nozzle_diameter);
# extrude along the path
return $self->extrude($extrusion_path, $description);
@ -118,16 +118,23 @@ sub extrude {
$gcode .= $self->unretract if $self->retracted;
# calculate extrusion length per distance unit
my $w = $path->flow_width || $Slic3r::flow_width;
my $s = $path->flow_spacing || $Slic3r::flow_spacing;
my $h = $path->depth_layers * $Slic3r::layer_height;
$h = $w if $path->role eq 'bridge';
my $w = ($s - $Slic3r::min_flow_spacing * $Slic3r::overlap_factor) / (1 - $Slic3r::overlap_factor);
# calculate additional flow for overlapping
my $overlap_area = $Slic3r::overlap_factor * (($Slic3r::layer_height**2) - ($Slic3r::layer_height**2) / 4 * PI);
$overlap_area = 0 if $path->role eq 'bridge';
my $area;
if ($path->role eq 'bridge') {
$area = ($s**2) * PI/4;
} elsif ($w >= ($Slic3r::nozzle_diameter + $h)) {
# rectangle with semicircles at the ends
$area = $w * $h + ($h**2) / 4 * (PI - 4);
} else {
# rectangle with shrunk semicircles at the ends
$area = $Slic3r::nozzle_diameter * $h * (1 - PI/4) + $h * $w * PI/4;
}
my $e = $Slic3r::resolution
* ($w * $h + ($Slic3r::layer_height**2) / 4 * (PI - 4) + $overlap_area)
* $area
* $Slic3r::extrusion_multiplier
* (4 / (($Slic3r::filament_diameter ** 2) * PI));