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fix rotate_sweep centroid calculation

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This commit is contained in:
Adrian Mariano
2025-08-27 17:38:15 -04:00
parent 3748cf4823
commit b23be10ad0
2 changed files with 16 additions and 13 deletions
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27
skin.scad
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@@ -1397,7 +1397,15 @@ module rotate_sweep(
: tex_reps;
tex_depth = is_def(tex_scale)? echo("In rotate_sweep() the 'tex_scale' parameter is deprecated and has been replaced by 'tex_depth'")tex_scale
: default(tex_depth,1);
region = _force_xplus(force_region(shape));
region = is_path(shape) && caps ? _force_xplus([deduplicate([[0,shape[0].y], each shape, [0,last(shape).y]])])
: _force_xplus(force_region(shape));
ctr2d = centroid(region);
ctr3d = [ctr2d.x, 0, ctr2d.y];
namedanch = angle==360 ? []
:[
named_anchor("start-centroid", ctr3d, FWD),
named_anchor("end-centroid", rot = zrot(angle)*move(ctr3d)*xrot(-90)*zrot(180))
];
check = assert(is_region(region), "\nInput is not a region or polygon.");
bounds = pointlist_bounds(flatten(region));
min_x = bounds[0].x;
@@ -1406,13 +1414,6 @@ module rotate_sweep(
max_y = bounds[1].y;
h = max_y - min_y;
check2 = assert(min_x>=0, "\nInput region must exist entirely in the X+ half-plane.");
ctr2d = centroid(shape);
ctr3d = [ctr2d.x, 0, ctr2d.y];
namedanch = angle==360 ? []
:[
named_anchor("start-centroid", ctr3d, FWD),
named_anchor("end-centroid", rot = zrot(angle)*move(ctr3d)*xrot(-90)*zrot(180))
];
if (!is_undef(texture)) {
_textured_revolution(
shape,
@@ -1434,8 +1435,6 @@ module rotate_sweep(
)
change_anchors(named=namedanch) children();
} else {
region = is_path(shape) && caps ? [deduplicate([[0,shape[0].y], each shape, [0,last(shape).y]])]
: region;
steps = ceil(segs(max_x) * angle / 360) + (angle<360? 1 : 0);
skmat = down(min_y) * skew(sxz=shift.x/h, syz=shift.y/h) * up(min_y);
transforms = [
@@ -2710,8 +2709,8 @@ function sweep(shape, transforms, closed=false, caps, style="min_edge",
for (rgn=regions) each [
for (path=rgn)
sweep(path, transforms, closed=closed, caps=false, style=style),
if (flatcaps[0]) vnf_from_region(rgn, transform=transforms[0], reverse=true),
if (flatcaps[1]) vnf_from_region(rgn, transform=last(transforms)),
if (flatcaps[0]) vnf_from_region(rgn, transform=transforms[0], reverse=true, triangulate=true), // triangulation needed?
if (flatcaps[1]) vnf_from_region(rgn, transform=last(transforms), triangulate=true),
],
],
vnf = vnf_join(vnfs)
@@ -4783,6 +4782,10 @@ function _textured_revolution(
testpoly = [[0,shape[0].y], each shape, [0,last(shape).y]]
)
[[is_polygon_clockwise(testpoly) ? shape : reverse(shape)]],
checks = [
for (rgn=regions, path=rgn)
assert(all(path, function(pt) pt.x>=0),"\nAll points in the shape must have non-negative x value."),

2
utility.scad
View File

@@ -986,7 +986,7 @@ module assert_equal(got, expected, info) {
// Returns the differential geometry if they are not quite the same shape and size.
// Arguments:
// eps = The surface of the two shapes must be within this size of each other. Default: 1/1024
// Example:
// Example(NORENDER): (Example disabled because OpenSCAD bug prevents it from displaying)
// $fn=36;
// shape_compare() {
// sphere(d=100);