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https://github.com/BelfrySCAD/BOSL2.git
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Added planer=true to minkowski_difference() and bounding_box(). Refactored shell2d().
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Garth Minette
parent
de7f8569bf
commit
69124938a6
2 changed files with 121 additions and 110 deletions
229
mutators.scad
229
mutators.scad
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@ -19,6 +19,7 @@
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// Returns an axis-aligned cube shape that exactly contains all the 3D children given.
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// Arguments:
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// excess = The amount that the bounding box should be larger than needed to bound the children, in each axis.
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// planar = If true, creates a 2D bounding rectangle. Is false, creates a 3D bounding cube. Default: false
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// Example:
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// #bounding_box() {
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// translate([10,8,4]) cube(5);
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@ -26,32 +27,41 @@
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// }
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// translate([10,8,4]) cube(5);
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// translate([3,0,12]) cube(2);
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module bounding_box(excess=0) {
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module bounding_box(excess=0, planar=true) {
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xs = excess>.1? excess : 1;
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// a 3D approx. of the children projection on X axis
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module _xProjection()
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linear_extrude(xs, center=true)
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if (planar) {
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projection()
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rotate([90,0,0])
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linear_extrude(xs, center=true)
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projection()
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hull()
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children();
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hull()
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children();
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} else {
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linear_extrude(xs, center=true)
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projection()
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rotate([90,0,0])
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linear_extrude(xs, center=true)
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projection()
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hull()
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children();
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}
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// a bounding box with an offset of 1 in all axis
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module _oversize_bbox() {
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minkowski() {
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_xProjection() children(); // x axis
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rotate(-90) _xProjection() rotate(90) children(); // y axis
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rotate([0,-90,0]) _xProjection() rotate([0,90,0]) children(); // z axis
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union() {
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rotate(-90) _xProjection() rotate(90) children(); // y axis
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if(!planar) rotate([0,-90,0]) _xProjection() rotate([0,90,0]) children(); // z axis
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}
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}
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}
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// offset children() (a cube) by -1 in all axis
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module _shrink_cube() {
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intersection() {
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translate((1-excess)*[ 1, 1, 1]) children();
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translate((1-excess)*[-1,-1,-1]) children();
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translate((1-excess)*[ 1, 1, planar?0: 1]) children();
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translate((1-excess)*[-1,-1, planar?0:-1]) children();
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}
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}
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@ -209,7 +219,6 @@ function left_half(_arg1=_undef, _arg2=_undef, _arg3=_undef,
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// right_half([s], [x]) ...
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// right_half(planar=true, [s], [x]) ...
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//
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//
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// Description:
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// Slices an object at a vertical Y-Z cut plane, and masks away everything that is left of it.
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//
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@ -516,31 +525,103 @@ module cylindrical_extrude(or, ir, od, id, size=1000, convexity=10, spin=0, orie
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// Section: Offset Mutators
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//////////////////////////////////////////////////////////////////////
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// Module: round3d()
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// Module: minkowski_difference()
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// Usage:
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// round3d(r) ...
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// round3d(or) ...
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// round3d(ir) ...
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// round3d(or, ir) ...
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// minkowski_difference() { base_shape(); diff_shape(); ... }
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// Description:
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// Rounds arbitrary 3D objects. Giving `r` rounds all concave and convex corners. Giving just `ir`
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// Takes a 3D base shape and one or more 3D diff shapes, carves out the diff shapes from the
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// surface of the base shape, in a way complementary to how `minkowski()` unions shapes to the
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// surface of its base shape.
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// Arguments:
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// planar = If true, performs minkowski difference in 2D. Default: false (3D)
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// Example:
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// minkowski_difference() {
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// union() {
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// cube([120,70,70], center=true);
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// cube([70,120,70], center=true);
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// cube([70,70,120], center=true);
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// }
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// sphere(r=10);
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// }
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module minkowski_difference(planar=false) {
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difference() {
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bounding_box(excess=0, planar=planar) children(0);
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render(convexity=20) {
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minkowski() {
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difference() {
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bounding_box(excess=1, planar=planar) children(0);
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children(0);
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}
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for (i=[1:1:$children-1]) children(i);
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}
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}
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}
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}
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// Module: round2d()
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// Usage:
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// round2d(r) ...
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// round2d(or) ...
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// round2d(ir) ...
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// round2d(or, ir) ...
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// Description:
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// Rounds arbitrary 2D objects. Giving `r` rounds all concave and convex corners. Giving just `ir`
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// rounds just concave corners. Giving just `or` rounds convex corners. Giving both `ir` and `or`
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// can let you round to different radii for concave and convex corners. The 3D object must not have
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// any parts narrower than twice the `or` radius. Such parts will disappear. This is an *extremely*
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// slow operation. I cannot emphasize enough just how slow it is. It uses `minkowski()` multiple times.
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// Use this as a last resort. This is so slow that no example images will be rendered.
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// can let you round to different radii for concave and convex corners. The 2D object must not have
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// any parts narrower than twice the `or` radius. Such parts will disappear.
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// Arguments:
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// r = Radius to round all concave and convex corners to.
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// or = Radius to round only outside (convex) corners to. Use instead of `r`.
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// ir = Radius to round only inside (concave) corners to. Use instead of `r`.
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module round3d(r, or, ir, size=100)
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// Examples(2D):
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// round2d(r=10) {square([40,100], center=true); square([100,40], center=true);}
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// round2d(or=10) {square([40,100], center=true); square([100,40], center=true);}
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// round2d(ir=10) {square([40,100], center=true); square([100,40], center=true);}
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// round2d(or=16,ir=8) {square([40,100], center=true); square([100,40], center=true);}
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module round2d(r, or, ir)
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{
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or = get_radius(r1=or, r=r, dflt=0);
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ir = get_radius(r1=ir, r=r, dflt=0);
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offset3d(or, size=size)
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offset3d(-ir-or, size=size)
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offset3d(ir, size=size)
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offset(or) offset(-ir-or) offset(delta=ir,chamfer=true) children();
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}
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// Module: shell2d()
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// Usage:
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// shell2d(thickness, [or], [ir], [fill], [round])
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// Description:
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// Creates a hollow shell from 2D children, with optional rounding.
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// Arguments:
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// thickness = Thickness of the shell. Positive to expand outward, negative to shrink inward, or a two-element list to do both.
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// or = Radius to round corners on the outside of the shell. If given a list of 2 radii, [CONVEX,CONCAVE], specifies the radii for convex and concave corners separately. Default: 0 (no outside rounding)
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// ir = Radius to round corners on the inside of the shell. If given a list of 2 radii, [CONVEX,CONCAVE], specifies the radii for convex and concave corners separately. Default: 0 (no inside rounding)
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// Examples(2D):
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// shell2d(10) {square([40,100], center=true); square([100,40], center=true);}
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// shell2d(-10) {square([40,100], center=true); square([100,40], center=true);}
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// shell2d([-10,10]) {square([40,100], center=true); square([100,40], center=true);}
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// shell2d(10,or=10) {square([40,100], center=true); square([100,40], center=true);}
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// shell2d(10,ir=10) {square([40,100], center=true); square([100,40], center=true);}
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// shell2d(10,round=10) {square([40,100], center=true); square([100,40], center=true);}
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// shell2d(10,fill=10) {square([40,100], center=true); square([100,40], center=true);}
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// shell2d(8,or=16,ir=8,round=16,fill=8) {square([40,100], center=true); square([100,40], center=true);}
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module shell2d(thickness, or=0, ir=0)
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{
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thickness = is_num(thickness)? (
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thickness<0? [thickness,0] : [0,thickness]
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) : (thickness[0]>thickness[1])? (
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[thickness[1],thickness[0]]
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) : thickness;
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orad = is_finite(or)? [or,or] : or;
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irad = is_finite(ir)? [ir,ir] : ir;
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difference() {
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round2d(or=orad[0],ir=orad[1])
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offset(delta=thickness[1])
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children();
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round2d(or=irad[1],ir=irad[0])
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offset(delta=thickness[0])
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children();
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}
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}
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@ -583,101 +664,31 @@ module offset3d(r=1, size=100, convexity=10) {
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}
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// Module: round2d()
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// Module: round3d()
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// Usage:
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// round2d(r) ...
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// round2d(or) ...
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// round2d(ir) ...
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// round2d(or, ir) ...
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// round3d(r) ...
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// round3d(or) ...
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// round3d(ir) ...
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// round3d(or, ir) ...
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// Description:
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// Rounds arbitrary 2D objects. Giving `r` rounds all concave and convex corners. Giving just `ir`
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// Rounds arbitrary 3D objects. Giving `r` rounds all concave and convex corners. Giving just `ir`
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// rounds just concave corners. Giving just `or` rounds convex corners. Giving both `ir` and `or`
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// can let you round to different radii for concave and convex corners. The 2D object must not have
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// any parts narrower than twice the `or` radius. Such parts will disappear.
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// can let you round to different radii for concave and convex corners. The 3D object must not have
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// any parts narrower than twice the `or` radius. Such parts will disappear. This is an *extremely*
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// slow operation. I cannot emphasize enough just how slow it is. It uses `minkowski()` multiple times.
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// Use this as a last resort. This is so slow that no example images will be rendered.
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// Arguments:
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// r = Radius to round all concave and convex corners to.
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// or = Radius to round only outside (convex) corners to. Use instead of `r`.
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// ir = Radius to round only inside (concave) corners to. Use instead of `r`.
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// Examples(2D):
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// round2d(r=10) {square([40,100], center=true); square([100,40], center=true);}
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// round2d(or=10) {square([40,100], center=true); square([100,40], center=true);}
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// round2d(ir=10) {square([40,100], center=true); square([100,40], center=true);}
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// round2d(or=16,ir=8) {square([40,100], center=true); square([100,40], center=true);}
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module round2d(r, or, ir)
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module round3d(r, or, ir, size=100)
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{
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or = get_radius(r1=or, r=r, dflt=0);
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ir = get_radius(r1=ir, r=r, dflt=0);
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offset(or) offset(-ir-or) offset(delta=ir,chamfer=true) children();
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}
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// Module: shell2d()
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// Usage:
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// shell2d(thickness, [or], [ir], [fill], [round])
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// Description:
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// Creates a hollow shell from 2D children, with optional rounding.
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// Arguments:
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// thickness = Thickness of the shell. Positive to expand outward, negative to shrink inward, or a two-element list to do both.
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// or = Radius to round convex corners/pointy bits on the outside of the shell.
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// ir = Radius to round concave corners on the outside of the shell.
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// round = Radius to round convex corners/pointy bits on the inside of the shell.
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// fill = Radius to round concave corners on the inside of the shell.
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// Examples(2D):
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// shell2d(10) {square([40,100], center=true); square([100,40], center=true);}
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// shell2d(-10) {square([40,100], center=true); square([100,40], center=true);}
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// shell2d([-10,10]) {square([40,100], center=true); square([100,40], center=true);}
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// shell2d(10,or=10) {square([40,100], center=true); square([100,40], center=true);}
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// shell2d(10,ir=10) {square([40,100], center=true); square([100,40], center=true);}
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// shell2d(10,round=10) {square([40,100], center=true); square([100,40], center=true);}
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// shell2d(10,fill=10) {square([40,100], center=true); square([100,40], center=true);}
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// shell2d(8,or=16,ir=8,round=16,fill=8) {square([40,100], center=true); square([100,40], center=true);}
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module shell2d(thickness, or=0, ir=0, fill=0, round=0)
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{
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thickness = is_num(thickness)? (
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thickness<0? [thickness,0] : [0,thickness]
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) : (thickness[0]>thickness[1])? (
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[thickness[1],thickness[0]]
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) : thickness;
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difference() {
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round2d(or=or,ir=ir)
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offset(delta=thickness[1])
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offset3d(or, size=size)
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offset3d(-ir-or, size=size)
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offset3d(ir, size=size)
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children();
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round2d(or=fill,ir=round)
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offset(delta=thickness[0])
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children();
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}
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}
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// Module: minkowski_difference()
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// Usage:
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// minkowski_difference() { base_shape(); diff_shape(); ... }
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// Description:
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// Takes a 3D base shape and one or more 3D diff shapes, carves out the diff shapes from the
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// surface of the base shape, in a way complementary to how `minkowski()` unions shapes to the
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// surface of its base shape.
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// Example:
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// minkowski_difference() {
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// union() {
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// cube([120,70,70], center=true);
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// cube([70,120,70], center=true);
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// cube([70,70,120], center=true);
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// }
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// sphere(r=10);
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// }
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module minkowski_difference() {
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difference() {
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bounding_box(excess=0) children(0);
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render(convexity=10) {
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minkowski() {
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difference() {
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bounding_box(excess=1) children(0);
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children(0);
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}
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for (i=[1:1:$children-1]) children(i);
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}
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}
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}
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}
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@ -8,7 +8,7 @@
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//////////////////////////////////////////////////////////////////////
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BOSL_VERSION = [2,0,482];
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BOSL_VERSION = [2,0,483];
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// Section: BOSL Library Version Functions
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