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Added negative roundings/chamfers to rect() and trapezoid(). Added teardrop= to cuboid()

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Garth Minette 2022-01-16 23:30:13 -08:00
parent 478bf12ea7
commit e09a6cd6dd
2 changed files with 135 additions and 58 deletions
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144
shapes2d.scad
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@ -84,8 +84,8 @@ module square(size=1, center, anchor, spin) {
// When called as a function, returns a 2D path/list of points for a square/rectangle of the given size. // When called as a function, returns a 2D path/list of points for a square/rectangle of the given size.
// Arguments: // Arguments:
// size = The size of the rectangle to create. If given as a scalar, both X and Y will be the same size. // size = The size of the rectangle to create. If given as a scalar, both X and Y will be the same size.
// rounding = The rounding radius for the corners. If given as a list of four numbers, gives individual radii for each corner, in the order [X+Y+,X-Y+,X-Y-,X+Y-]. Default: 0 (no rounding) // rounding = The rounding radius for the corners. If negative, produces external roundover spikes on the X axis. If given as a list of four numbers, gives individual radii for each corner, in the order [X+Y+,X-Y+,X-Y-,X+Y-]. Default: 0 (no rounding)
// chamfer = The chamfer size for the corners. If given as a list of four numbers, gives individual chamfers for each corner, in the order [X+Y+,X-Y+,X-Y-,X+Y-]. Default: 0 (no chamfer) // chamfer = The chamfer size for the corners. If negative, produces external chamfer spikes on the X axis. If given as a list of four numbers, gives individual chamfers for each corner, in the order [X+Y+,X-Y+,X-Y-,X+Y-]. Default: 0 (no chamfer)
// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#subsection-anchor). Default: `CENTER` // anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#subsection-anchor). Default: `CENTER`
// spin = Rotate this many degrees around the Z axis after anchor. See [spin](attachments.scad#subsection-spin). Default: `0` // spin = Rotate this many degrees around the Z axis after anchor. See [spin](attachments.scad#subsection-spin). Default: `0`
// Example(2D): // Example(2D):
@ -98,6 +98,10 @@ module square(size=1, center, anchor, spin) {
// rect([40,30], chamfer=5); // rect([40,30], chamfer=5);
// Example(2D): Rounded Rect // Example(2D): Rounded Rect
// rect([40,30], rounding=5); // rect([40,30], rounding=5);
// Example(2D): Negative-Chamferred Rect
// rect([40,30], chamfer=-5);
// Example(2D): Negative-Rounded Rect
// rect([40,30], rounding=-5);
// Example(2D): Mixed Chamferring and Rounding // Example(2D): Mixed Chamferring and Rounding
// rect([40,30],rounding=[5,0,10,0],chamfer=[0,8,0,15],$fa=1,$fs=1); // rect([40,30],rounding=[5,0,10,0],chamfer=[0,8,0,15],$fa=1,$fs=1);
// Example(2D): Called as Function // Example(2D): Called as Function
@ -145,7 +149,8 @@ function rect(size=1, rounding=0, chamfer=0, anchor=CENTER, spin=0) =
rounding = is_list(rounding)? rounding : [for (i=[0:3]) rounding], rounding = is_list(rounding)? rounding : [for (i=[0:3]) rounding],
quadorder = [3,2,1,0], quadorder = [3,2,1,0],
quadpos = [[1,1],[-1,1],[-1,-1],[1,-1]], quadpos = [[1,1],[-1,1],[-1,-1],[1,-1]],
insets = [for (i=[0:3]) chamfer[i]>0? chamfer[i] : rounding[i]>0? rounding[i] : 0], eps = 1e-9,
insets = [for (i=[0:3]) abs(chamfer[i])>=eps? chamfer[i] : abs(rounding[i])>=eps? rounding[i] : 0],
insets_x = max(insets[0]+insets[1],insets[2]+insets[3]), insets_x = max(insets[0]+insets[1],insets[2]+insets[3]),
insets_y = max(insets[0]+insets[3],insets[1]+insets[2]) insets_y = max(insets[0]+insets[3],insets[1]+insets[2])
) )
@ -156,16 +161,20 @@ function rect(size=1, rounding=0, chamfer=0, anchor=CENTER, spin=0) =
for(i = [0:3]) for(i = [0:3])
let( let(
quad = quadorder[i], quad = quadorder[i],
inset = insets[quad], qinset = insets[quad],
cverts = quant(segs(inset),4)/4, qpos = quadpos[quad],
cp = v_mul(size/2-[inset,inset], quadpos[quad]), qchamf = chamfer[quad],
qround = rounding[quad],
cverts = quant(segs(abs(qinset)),4)/4,
step = 90/cverts, step = 90/cverts,
angs = cp = v_mul(size/2-[qinset,abs(qinset)], qpos),
chamfer[quad] > 0? [0,-90]-90*[i,i] : qpts = abs(qchamf) >= eps? [[0,abs(qinset)], [qinset,0]] :
rounding[quad] > 0? [for (j=[0:1:cverts]) 360-j*step-i*90] : abs(qround) >= eps? [for (j=[0:1:cverts]) let(a=90-j*step) v_mul(polar_to_xy(abs(qinset),a),[sign(qinset),1])] :
[0] [[0,0]],
qfpts = [for (p=qpts) v_mul(p,qpos)],
qrpts = qpos.x*qpos.y < 0? reverse(qfpts) : qfpts
) )
each [for (a = angs) cp + inset*[cos(a),sin(a)]] each move(cp, p=qrpts)
] ]
) complex? ) complex?
reorient(anchor,spin, two_d=true, path=path, p=path) : reorient(anchor,spin, two_d=true, path=path, p=path) :
@ -785,6 +794,7 @@ module right_triangle(size=[1,1], center, anchor, spin=0) {
// shift = Scalar value to shift the back of the trapezoid along the X axis by. Default: 0 // shift = Scalar value to shift the back of the trapezoid along the X axis by. Default: 0
// rounding = The rounding radius for the corners. If given as a list of four numbers, gives individual radii for each corner, in the order [X+Y+,X-Y+,X-Y-,X+Y-]. Default: 0 (no rounding) // rounding = The rounding radius for the corners. If given as a list of four numbers, gives individual radii for each corner, in the order [X+Y+,X-Y+,X-Y-,X+Y-]. Default: 0 (no rounding)
// chamfer = The Length of the chamfer faces at the corners. If given as a list of four numbers, gives individual chamfers for each corner, in the order [X+Y+,X-Y+,X-Y-,X+Y-]. Default: 0 (no chamfer) // chamfer = The Length of the chamfer faces at the corners. If given as a list of four numbers, gives individual chamfers for each corner, in the order [X+Y+,X-Y+,X-Y-,X+Y-]. Default: 0 (no chamfer)
// flip = If true, negative roundings and chamfers will point forward and back instead of left and right. Default: `false`.
// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#subsection-anchor). Default: `CENTER` // anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#subsection-anchor). Default: `CENTER`
// spin = Rotate this many degrees around the Z axis after anchor. See [spin](attachments.scad#subsection-spin). Default: `0` // spin = Rotate this many degrees around the Z axis after anchor. See [spin](attachments.scad#subsection-spin). Default: `0`
// Examples(2D): // Examples(2D):
@ -796,15 +806,23 @@ module right_triangle(size=[1,1], center, anchor, spin=0) {
// trapezoid(h=20, w2=10, angle=30); // trapezoid(h=20, w2=10, angle=30);
// trapezoid(h=20, w2=30, angle=-30); // trapezoid(h=20, w2=30, angle=-30);
// trapezoid(w1=30, w2=10, angle=30); // trapezoid(w1=30, w2=10, angle=30);
// Example(2D): Chamferred Trapezoid // Example(2D): Chamfered Trapezoid
// trapezoid(h=30, w1=60, w2=40, chamfer=5); // trapezoid(h=30, w1=60, w2=40, chamfer=5);
// Example(2D): Negative Chamfered Trapezoid
// trapezoid(h=30, w1=60, w2=40, chamfer=-5);
// Example(2D): Flipped Negative Chamfered Trapezoid
// trapezoid(h=30, w1=60, w2=40, chamfer=-5, flip=true);
// Example(2D): Rounded Trapezoid // Example(2D): Rounded Trapezoid
// trapezoid(h=30, w1=60, w2=40, rounding=5); // trapezoid(h=30, w1=60, w2=40, rounding=5);
// Example(2D): Negative Rounded Trapezoid
// trapezoid(h=30, w1=60, w2=40, rounding=-5);
// Example(2D): Flipped Negative Rounded Trapezoid
// trapezoid(h=30, w1=60, w2=40, rounding=-5, flip=true);
// Example(2D): Mixed Chamfering and Rounding // Example(2D): Mixed Chamfering and Rounding
// trapezoid(h=30, w1=60, w2=40, rounding=[5,0,10,0],chamfer=[0,8,0,15],$fa=1,$fs=1); // trapezoid(h=30, w1=60, w2=40, rounding=[5,0,-10,0],chamfer=[0,8,0,-15],$fa=1,$fs=1);
// Example(2D): Called as Function // Example(2D): Called as Function
// stroke(closed=true, trapezoid(h=30, w1=40, w2=20)); // stroke(closed=true, trapezoid(h=30, w1=40, w2=20));
function trapezoid(h, w1, w2, angle, shift=0, chamfer=0, rounding=0, anchor=CENTER, spin=0) = function trapezoid(h, w1, w2, angle, shift=0, chamfer=0, rounding=0, flip=false, anchor=CENTER, spin=0) =
assert(is_undef(h) || is_finite(h)) assert(is_undef(h) || is_finite(h))
assert(is_undef(w1) || is_finite(w1)) assert(is_undef(w1) || is_finite(w1))
assert(is_undef(w2) || is_finite(w2)) assert(is_undef(w2) || is_finite(w2))
@ -817,23 +835,66 @@ function trapezoid(h, w1, w2, angle, shift=0, chamfer=0, rounding=0, anchor=CENT
simple = chamfer==0 && rounding==0, simple = chamfer==0 && rounding==0,
h = !is_undef(h)? h : opp_ang_to_adj(abs(w2-w1)/2, abs(angle)), h = !is_undef(h)? h : opp_ang_to_adj(abs(w2-w1)/2, abs(angle)),
w1 = !is_undef(w1)? w1 : w2 + 2*(adj_ang_to_opp(h, angle) + shift), w1 = !is_undef(w1)? w1 : w2 + 2*(adj_ang_to_opp(h, angle) + shift),
w2 = !is_undef(w2)? w2 : w1 - 2*(adj_ang_to_opp(h, angle) + shift) w2 = !is_undef(w2)? w2 : w1 - 2*(adj_ang_to_opp(h, angle) + shift),
chamfs = is_num(chamfer)? [for (i=[0:3]) chamfer] :
assert(len(chamfer)==4) chamfer,
rounds = is_num(rounding)? [for (i=[0:3]) rounding] :
assert(len(rounding)==4) rounding,
srads = [for (i=[0:3]) rounds[i]? rounds[i] : chamfs[i]],
rads = v_abs(srads)
) )
assert(w1>=0 && w2>=0 && h>0, "Degenerate trapezoid geometry.") assert(w1>=0 && w2>=0 && h>0, "Degenerate trapezoid geometry.")
assert(w1+w2>0, "Degenerate trapezoid geometry.") assert(w1+w2>0, "Degenerate trapezoid geometry.")
let( let(
base_path = [ base = [
[w2/2+shift,h/2], [ w2/2+shift, h/2],
[-w2/2+shift,h/2], [-w2/2+shift, h/2],
[-w1/2,-h/2], [-w1/2,-h/2],
[w1/2,-h/2], [ w1/2,-h/2],
], ],
cpath = simple? base_path : ang1 = v_theta(base[0]-base[3])-90,
path_chamfer_and_rounding( ang2 = v_theta(base[1]-base[2])-90,
base_path, closed=true, angs = [ang1, ang2, ang2, ang1],
chamfer=chamfer, qdirs = [[1,1], [-1,1], [-1,-1], [1,-1]],
rounding=rounding hyps = [for (i=[0:3]) adj_ang_to_hyp(rads[i],angs[i])],
fluh=echo(),
offs = [
for (i=[0:3]) let(
xoff = adj_ang_to_opp(rads[i],angs[i]),
a = [xoff, -rads[i]] * qdirs[i].y * (srads[i]<0 && flip? -1 : 1),
b = a + [hyps[i] * qdirs[i].x * (srads[i]<0 && !flip? 1 : -1), 0]
) b
],
cpath = [
each (
let(i = 0)
rads[i] == 0? [base[i]] :
srads[i] > 0? arc(N=rounds[i]?undef:2, cp=base[i]+offs[i], angle=[angs[i], 90], r=rads[i]) :
flip? arc(N=rounds[i]?undef:2, cp=base[i]+offs[i], angle=[angs[i],-90], r=rads[i]) :
arc(N=rounds[i]?undef:2, cp=base[i]+offs[i], angle=[180+angs[i],90], r=rads[i])
), ),
each (
let(i = 1)
rads[i] == 0? [base[i]] :
srads[i] > 0? arc(N=rounds[i]?undef:2, cp=base[i]+offs[i], angle=[90,180+angs[i]], r=rads[i]) :
flip? arc(N=rounds[i]?undef:2, cp=base[i]+offs[i], angle=[270,180+angs[i]], r=rads[i]) :
arc(N=rounds[i]?undef:2, cp=base[i]+offs[i], angle=[90,angs[i]], r=rads[i])
),
each (
let(i = 2)
rads[i] == 0? [base[i]] :
srads[i] > 0? arc(N=rounds[i]?undef:2, cp=base[i]+offs[i], angle=[180+angs[i],270], r=rads[i]) :
flip? arc(N=rounds[i]?undef:2, cp=base[i]+offs[i], angle=[180+angs[i],90], r=rads[i]) :
arc(N=rounds[i]?undef:2, cp=base[i]+offs[i], angle=[angs[i],-90], r=rads[i])
),
each (
let(i = 3)
rads[i] == 0? [base[i]] :
srads[i] > 0? arc(N=rounds[i]?undef:2, cp=base[i]+offs[i], angle=[-90,angs[i]], r=rads[i]) :
flip? arc(N=rounds[i]?undef:2, cp=base[i]+offs[i], angle=[90,angs[i]], r=rads[i]) :
arc(N=rounds[i]?undef:2, cp=base[i]+offs[i], angle=[270,180+angs[i]], r=rads[i])
),
],
path = reverse(cpath) path = reverse(cpath)
) simple ) simple
? reorient(anchor,spin, two_d=true, size=[w1,h], size2=w2, shift=shift, p=path) ? reorient(anchor,spin, two_d=true, size=[w1,h], size2=w2, shift=shift, p=path)
@ -841,8 +902,8 @@ function trapezoid(h, w1, w2, angle, shift=0, chamfer=0, rounding=0, anchor=CENT
module trapezoid(h, w1, w2, angle, shift=0, chamfer=0, rounding=0, anchor=CENTER, spin=0) { module trapezoid(h, w1, w2, angle, shift=0, chamfer=0, rounding=0, flip=false, anchor=CENTER, spin=0) {
path = trapezoid(h=h, w1=w1, w2=w2, angle=angle, shift=shift, chamfer=chamfer, rounding=rounding); path = trapezoid(h=h, w1=w1, w2=w2, angle=angle, shift=shift, chamfer=chamfer, rounding=rounding, flip=flip);
union() { union() {
simple = chamfer==0 && rounding==0; simple = chamfer==0 && rounding==0;
h = !is_undef(h)? h : opp_ang_to_adj(abs(w2-w1)/2, abs(angle)); h = !is_undef(h)? h : opp_ang_to_adj(abs(w2-w1)/2, abs(angle));
@ -1103,26 +1164,17 @@ module teardrop2d(r, ang=45, cap_h, d, anchor=CENTER, spin=0)
function teardrop2d(r, ang=45, cap_h, d, anchor=CENTER, spin=0) = function teardrop2d(r, ang=45, cap_h, d, anchor=CENTER, spin=0) =
let( let(
r = get_radius(r=r, d=d, dflt=1), r = get_radius(r=r, d=d, dflt=1),
tanpt = polar_to_xy(r, ang), ang2 = 90-ang,
tip_y = adj_ang_to_hyp(r, 90-ang), prepath = zrot(90, p=circle(r=r)),
cap_h = min(default(cap_h,tip_y), tip_y), eps=1e-9,
cap_w = tanpt.y >= cap_h prepath2 = [for (p=prepath) let(a=atan2(p.y,p.x)) if(a<=90-ang2+eps || a>=90+ang2-eps) p],
? hyp_opp_to_adj(r, cap_h) hyp = is_undef(cap_h)
: adj_ang_to_opp(tip_y-cap_h, ang), ? opp_ang_to_hyp(abs(prepath2[0].x), ang)
ang2 = min(ang,atan2(cap_h,cap_w)), : adj_ang_to_hyp(cap_h-prepath2[0].y, ang),
sa = 180 - ang2, p1 = prepath2[0] + polar_to_xy(hyp, 90+ang),
ea = 360 + ang2, p2 = last(prepath2) + polar_to_xy(hyp, 90-ang),
steps = ceil(segs(r)*(ea-sa)/360), path = deduplicate([p1, each prepath2, p2], closed=true)
path = deduplicate( ) reorient(anchor,spin, two_d=true, path=path, p=path, extent=false);
[
[ cap_w,cap_h],
for (a=lerpn(ea,sa,steps+1)) r*[cos(a),sin(a)],
[-cap_w,cap_h]
], closed=true
),
maxx_idx = max_index(column(path,0)),
path2 = list_rotate(path,maxx_idx)
) reorient(anchor,spin, two_d=true, path=path2, p=path2, extent=false);

49
shapes3d.scad
View file

@ -113,6 +113,7 @@ function cube(size=1, center, anchor, spin=0, orient=UP) =
// edges = Edges to mask. See [Specifying Edges](attachments.scad#section-specifying-edges). Default: all edges. // edges = Edges to mask. See [Specifying Edges](attachments.scad#section-specifying-edges). Default: all edges.
// except = Edges to explicitly NOT mask. See [Specifying Edges](attachments.scad#section-specifying-edges). Default: No edges. // except = Edges to explicitly NOT mask. See [Specifying Edges](attachments.scad#section-specifying-edges). Default: No edges.
// trimcorners = If true, rounds or chamfers corners where three chamfered/rounded edges meet. Default: `true` // trimcorners = If true, rounds or chamfers corners where three chamfered/rounded edges meet. Default: `true`
// teardrop = If given as a number, rounding around the bottom edge of the cuboid won't exceed this many degrees from vertical. If true, the limit angle is 45 degrees. Default: `false`
// p1 = Align the cuboid's corner at `p1`, if given. Forces `anchor=FRONT+LEFT+BOTTOM`. // p1 = Align the cuboid's corner at `p1`, if given. Forces `anchor=FRONT+LEFT+BOTTOM`.
// p2 = If given with `p1`, defines the cornerpoints of the cuboid. // p2 = If given with `p1`, defines the cornerpoints of the cuboid.
// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#subsection-anchor). Default: `CENTER` // anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#subsection-anchor). Default: `CENTER`
@ -181,10 +182,32 @@ module cuboid(
except=[], except=[],
except_edges, except_edges,
trimcorners=true, trimcorners=true,
teardrop=false,
anchor=CENTER, anchor=CENTER,
spin=0, spin=0,
orient=UP orient=UP
) { ) {
module xtcyl(l,r) {
if (teardrop) {
teardrop(r=r, l=l, cap_h=r, ang=teardrop, spin=90, orient=DOWN);
} else {
yrot(90) cyl(l=l, r=r);
}
}
module ytcyl(l,r) {
if (teardrop) {
teardrop(r=r, l=l, cap_h=r, ang=teardrop, spin=0, orient=DOWN);
} else {
zrot(90) yrot(90) cyl(l=l, r=r);
}
}
module tsphere(r) {
if (teardrop) {
onion(r=r, cap_h=r, ang=teardrop, orient=DOWN);
} else {
spheroid(r=r, style="octa", orient=DOWN);
}
}
module corner_shape(corner) { module corner_shape(corner) {
e = _corner_edges(edges, corner); e = _corner_edges(edges, corner);
cnt = sum(e); cnt = sum(e);
@ -197,33 +220,33 @@ module cuboid(
if (cnt == 0 || approx(r,0)) { if (cnt == 0 || approx(r,0)) {
translate(c2) cube(c, center=true); translate(c2) cube(c, center=true);
} else if (cnt == 1) { } else if (cnt == 1) {
if (e.x) right(c2.x) xcyl(l=c.x, r=r); if (e.x) right(c2.x) xtcyl(l=c.x, r=r);
if (e.y) back (c2.y) ycyl(l=c.y, r=r); if (e.y) back (c2.y) ytcyl(l=c.y, r=r);
if (e.z) up (c2.z) zcyl(l=c.z, r=r); if (e.z) up (c2.z) zcyl(l=c.z, r=r);
} else if (cnt == 2) { } else if (cnt == 2) {
if (!e.x) { if (!e.x) {
intersection() { intersection() {
ycyl(l=c.y*2, r=r); ytcyl(l=c.y*2, r=r);
zcyl(l=c.z*2, r=r); zcyl(l=c.z*2, r=r);
} }
} else if (!e.y) { } else if (!e.y) {
intersection() { intersection() {
xcyl(l=c.x*2, r=r); xtcyl(l=c.x*2, r=r);
zcyl(l=c.z*2, r=r); zcyl(l=c.z*2, r=r);
} }
} else { } else {
intersection() { intersection() {
xcyl(l=c.x*2, r=r); xtcyl(l=c.x*2, r=r);
ycyl(l=c.y*2, r=r); ytcyl(l=c.y*2, r=r);
} }
} }
} else { } else {
if (trimcorners) { if (trimcorners) {
spheroid(r=r, style="octa"); tsphere(r=r);
} else { } else {
intersection() { intersection() {
xcyl(l=c.x*2, r=r); xtcyl(l=c.x*2, r=r);
ycyl(l=c.y*2, r=r); ytcyl(l=c.y*2, r=r);
zcyl(l=c.z*2, r=r); zcyl(l=c.z*2, r=r);
} }
} }
@ -233,6 +256,7 @@ module cuboid(
size = scalar_vec3(size); size = scalar_vec3(size);
edges = _edges(edges, except=first_defined([except_edges,except])); edges = _edges(edges, except=first_defined([except_edges,except]));
teardrop = is_bool(teardrop)&&teardrop? 45 : teardrop;
chamfer = approx(chamfer,0) ? undef : chamfer; chamfer = approx(chamfer,0) ? undef : chamfer;
rounding = approx(rounding,0) ? undef : rounding; rounding = approx(rounding,0) ? undef : rounding;
assert(is_vector(size,3)); assert(is_vector(size,3));
@ -240,6 +264,7 @@ module cuboid(
assert(is_undef(chamfer) || is_finite(chamfer),"chamfer must be a finite value"); assert(is_undef(chamfer) || is_finite(chamfer),"chamfer must be a finite value");
assert(is_undef(rounding) || is_finite(rounding),"rounding must be a finite value"); assert(is_undef(rounding) || is_finite(rounding),"rounding must be a finite value");
assert(is_undef(rounding) || is_undef(chamfer), "Cannot specify nonzero value for both chamfer and rounding"); assert(is_undef(rounding) || is_undef(chamfer), "Cannot specify nonzero value for both chamfer and rounding");
assert(teardrop==false || (is_finite(teardrop) && teardrop>0 && teardrop<90), "teardrop must be either false or an angle number between 0 and 90")
assert(is_undef(p1) || is_vector(p1)); assert(is_undef(p1) || is_vector(p1));
assert(is_undef(p2) || is_vector(p2)); assert(is_undef(p2) || is_vector(p2));
assert(is_bool(trimcorners)); assert(is_bool(trimcorners));
@ -358,12 +383,12 @@ module cuboid(
minkowski() { minkowski() {
cube(isize, center=true); cube(isize, center=true);
if (trimcorners) { if (trimcorners) {
spheroid(r=rounding, style="octa", $fn=sides); tsphere(r=rounding, $fn=sides);
} else { } else {
intersection() { intersection() {
xtcyl(r=rounding, h=rounding*2, $fn=sides);
ytcyl(r=rounding, h=rounding*2, $fn=sides);
cyl(r=rounding, h=rounding*2, $fn=sides); cyl(r=rounding, h=rounding*2, $fn=sides);
rotate([90,0,0]) cyl(r=rounding, h=rounding*2, $fn=sides);
rotate([0,90,0]) cyl(r=rounding, h=rounding*2, $fn=sides);
} }
} }
} }