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bugfix in mb_stadium, added animation

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Alex Matulich
2025-03-25 00:44:05 -07:00
parent e797f0e48d
commit 1f0ff84a38
2 changed files with 6 additions and 5 deletions
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@@ -1648,7 +1648,6 @@ function debug_tetra(r) = let(size=r/norm([1,1,1])) [
// Section: Metaballs // Section: Metaballs
// ![Metaball animation](https://raw.githubusercontent.com/BelfrySCAD/BOSL2/master/images/metaball_demo.gif) // ![Metaball animation](https://raw.githubusercontent.com/BelfrySCAD/BOSL2/master/images/metaball_demo.gif)
// ![Metaball animation](https://raw.githubusercontent.com/BelfrySCAD/BOSL2/master/images/metaball_demo2d.gif)
// . // .
// [Metaballs](https://en.wikipedia.org/wiki/Metaballs), also known as "blobby objects", // [Metaballs](https://en.wikipedia.org/wiki/Metaballs), also known as "blobby objects",
// can produce smoothly varying blobs and organic forms. You create metaballs by placing metaball // can produce smoothly varying blobs and organic forms. You create metaballs by placing metaball
@@ -2653,13 +2652,13 @@ function mb_stadium(size, cutoff=INF, influence=1, negative=false, hide_debug=fa
length = shape>=0 ? siz[1] : siz[0], length = shape>=0 ? siz[1] : siz[0],
r = shape>=0 ? siz[0]/2 : siz[1]/2, r = shape>=0 ? siz[0]/2 : siz[1]/2,
sl = length-2*r, // straight side length sl = length-2*r, // straight side length
dum3 = assert(sl>0, "\nTotal length must accommodate rounded ends of rectangle."), //dum3 = assert(sl>=0, "\nTotal length must accommodate rounded ends of rectangle."),
neg = negative ? -1 : 1, neg = negative ? -1 : 1,
poly = shape<=EPSILON ? [neg, hide_debug ? circle(r=0.02, $fn=3) : circle(r=r, $fn=20)] poly = abs(shape)<=EPSILON ? [neg, hide_debug ? circle(r=0.02, $fn=3) : circle(r=r, $fn=20)]
: shape>0 ? [neg, hide_debug ? square(0.02,center=true) : rect([2*r,length], rounding=0.999*r, $fn=20)] : shape>0 ? [neg, hide_debug ? square(0.02,center=true) : rect([2*r,length], rounding=0.999*r, $fn=20)]
: [neg, hide_debug ? square(0.02,center=true) : rect([length,2*r], rounding=0.999*r, $fn=20)] : [neg, hide_debug ? square(0.02,center=true) : rect([length,2*r], rounding=0.999*r, $fn=20)]
) abs(shape)<EPSILON ? ) abs(shape)<EPSILON ?
[function (dv) _mb_circle_full(point, r, cutoff, 1/influence, neg), poly] [function (dv) _mb_circle_full(dv, r, cutoff, 1/influence, neg), poly]
: shape>0 ? [function (dv) _mb_stadium_full(dv, sl/2, r, cutoff, 1/influence, neg), poly] : shape>0 ? [function (dv) _mb_stadium_full(dv, sl/2, r, cutoff, 1/influence, neg), poly]
: [function (dv) _mb_stadium_sideways_full(dv, sl/2, r, cutoff, 1/influence, neg), poly]; : [function (dv) _mb_stadium_sideways_full(dv, sl/2, r, cutoff, 1/influence, neg), poly];
@@ -2719,6 +2718,8 @@ function mb_ring(r1,r2, cutoff=INF, influence=1, negative=false, hide_debug=fals
// Usage: As a function // Usage: As a function
// region = metaballs2d(spec, bounding_box, pixel_size, [isovalue=], [closed=], [use_centers=], [smoothing=], [exact_bounds=], [show_stats=]); // region = metaballs2d(spec, bounding_box, pixel_size, [isovalue=], [closed=], [use_centers=], [smoothing=], [exact_bounds=], [show_stats=]);
// Description: // Description:
// ![Metaball animation](https://raw.githubusercontent.com/BelfrySCAD/BOSL2/master/images/metaball_demo2d.gif)
// .
// 2D metaball shapes can be useful to create interesting polygons for extrusion. When invoked as a // 2D metaball shapes can be useful to create interesting polygons for extrusion. When invoked as a
// module, a 2D metaball scene is displayed. When called as a function, a list containing one or more // module, a 2D metaball scene is displayed. When called as a function, a list containing one or more
// [paths](paths.scad) is returned. // [paths](paths.scad) is returned.
@@ -2954,7 +2955,7 @@ function mb_ring(r1,r2, cutoff=INF, influence=1, negative=false, hide_debug=fals
module metaballs2d(spec, bounding_box, pixel_size, pixel_count, isovalue=1, use_centers=false, smoothing=undef, exact_bounds=false, convexity=6, cp="centroid", anchor="origin", spin=0, atype="hull", show_stats=false, show_box=false, debug=false) { module metaballs2d(spec, bounding_box, pixel_size, pixel_count, isovalue=1, use_centers=false, smoothing=undef, exact_bounds=false, convexity=6, cp="centroid", anchor="origin", spin=0, atype="hull", show_stats=false, show_box=false, debug=false) {
regionlist = metaballs2d(spec, bounding_box, pixel_size, pixel_count, isovalue, true, use_centers, smoothing, exact_bounds, show_stats, _debug=debug); regionlist = metaballs2d(spec, bounding_box, pixel_size, pixel_count, isovalue, true, use_centers, smoothing, exact_bounds, show_stats, _debug=debug);
$metaball_pathlist = debug ? regionlist[0] : regionlist; // for possible use with children $metaball_pathlist = debug ? regionlist[0] : regionlist; // for possible use with children
wid = min(0.5, 0.25 * (is_num(pixel_size) ? pixel_size : 0.5*(pixel_size[0]+pixel_size[1]))); wid = min(0.5, 0.5 * (is_num(pixel_size) ? pixel_size : 0.5*(pixel_size[0]+pixel_size[1])));
if(debug) { if(debug) {
// display debug polygons // display debug polygons
for(a=regionlist[1]) for(a=regionlist[1])