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improve fillet() anchors, add example to attachments tutorial

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Adrian Mariano 2024-02-04 18:19:24 -05:00
parent c6b24793c9
commit 6621a918b9
2 changed files with 44 additions and 12 deletions
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6
shapes3d.scad
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@ -3349,7 +3349,11 @@ module fillet(l=1.0, r, ang=90, overlap=0.01, d, length, h, height, anchor=CENTE
arc[0] + polar_to_xy(overlap, 90+ang), arc[0] + polar_to_xy(overlap, 90+ang),
each arc each arc
]; ];
attachable(anchor,spin,orient, size=[2*maxx,2*maxy,l]) { override = function (anchor)
anchor.x>=0 && anchor.y>=0 ? undef
:
[[max(0,anchor.x)*maxx, max(0,anchor.y)*maxy, anchor.z*l/2]];
attachable(anchor,spin,orient, size=[2*maxx,2*maxy,l],override=override) {
if (l > 0) { if (l > 0) {
linear_extrude(height=l, convexity=4, center=true) { linear_extrude(height=l, convexity=4, center=true) {
polygon(path); polygon(path);

50
tutorials/Attachments.md
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@ -1262,7 +1262,7 @@ module cubic_barbell(s=100, anchor=CENTER, spin=0, orient=UP) {
children(); children();
} }
} }
cubic_barbell(100) show_anchors(30); cubic_barbell(100) show_anchors(60);
``` ```
When the shape is prismoidal, where the top is a different size from the bottom, you can use When the shape is prismoidal, where the top is a different size from the bottom, you can use
@ -1646,12 +1646,15 @@ anchors at x=0 are in floating in space. For prismoidal/cubic anchors
in 3D and trapezoidal/rectangular anchors in 2D we can override a single anchor by in 3D and trapezoidal/rectangular anchors in 2D we can override a single anchor by
specifying the override option and giving the anchor that is being specifying the override option and giving the anchor that is being
overridden, and then the replacement in the form overridden, and then the replacement in the form
`[position, direction, spin]`. Below we override the FWD anchor: `[position, direction, spin]`. Most often you will only want to
override the position. If you omit the other list items then the
value drived from the standard anchor will be used. Below we override
position of the FWD anchor:
``` ```
module cubic_barbell(s=100, anchor=CENTER, spin=0, orient=UP) { module cubic_barbell(s=100, anchor=CENTER, spin=0, orient=UP) {
override = [ override = [
[FWD, [[0,-s/8,0], FWD, 0]] [FWD, [[0,-s/8,0]]]
]; ];
attachable(anchor,spin,orient, size=[s*3,s,s],override=override) { attachable(anchor,spin,orient, size=[s*3,s,s],override=override) {
union() { union() {
@ -1661,17 +1664,41 @@ module cubic_barbell(s=100, anchor=CENTER, spin=0, orient=UP) {
children(); children();
} }
} }
cubic_barbell(100) show_anchors(30); cubic_barbell(100) show_anchors(60);
``` ```
Note how the FWD anchor is now rooted on the cylindrical portion. You Note how the FWD anchor is now rooted on the cylindrical portion. If
can override all of the x=0 anchors by supplying a list like this: you wanted to also change its direction and spin you could do it like
this:
```
module cubic_barbell(s=100, anchor=CENTER, spin=0, orient=UP) {
override = [
[FWD, [[0,-s/8,0], FWD+LEFT, 225]]
];
attachable(anchor,spin,orient, size=[s*3,s,s],override=override) {
union() {
xcopies(2*s) cube(s, center=true);
xcyl(h=2*s, d=s/4);
}
children();
}
}
cubic_barbell(100) show_anchors(60);
```
In the above example we give three values for the override. As
before, the first one places the anchor on the cylinder. We have
added the second entry which points the anchor off to the left.
The third entry gives a spin override, whose effect is shown by the
position of the red flag on the arrow. If you want to override all of
the x=0 anchors to be on the cylinder, with their standard directions,
you can do that by supplying a list:
``` ```
module cubic_barbell(s=100, anchor=CENTER, spin=0, orient=UP) { module cubic_barbell(s=100, anchor=CENTER, spin=0, orient=UP) {
override = [ override = [
for(j=[-1:1:1], k=[-1:1:1]) for(j=[-1:1:1], k=[-1:1:1])
if ([j,k]!=[0,0]) [[0,j,k], [s/8*unit([0,j,k]), unit([0,j,k]),0]] if ([j,k]!=[0,0]) [[0,j,k], [s/8*unit([0,j,k])]]
]; ];
attachable(anchor,spin,orient, size=[s*3,s,s],override=override) { attachable(anchor,spin,orient, size=[s*3,s,s],override=override) {
union() { union() {
@ -1684,17 +1711,18 @@ module cubic_barbell(s=100, anchor=CENTER, spin=0, orient=UP) {
cubic_barbell(100) show_anchors(30); cubic_barbell(100) show_anchors(30);
``` ```
Now the anchors in the middle are all rooted to the cylinder. Another Now all of the anchors in the middle are all rooted to the cylinder. Another
way to do the same thing is to use a function literal for override. way to do the same thing is to use a function literal for override.
It will be called with the anchor and need to return undef to just use It will be called with the anchor as its argument and needs to return undef to just use
the default, or a `[position, direction, spin]` triple to override the the default, or a `[position, direction, spin]` triple to override the
default. Here is the same example using a function literal for the override: default. As before, you can omit values to keep their default.
Here is the same example using a function literal for the override:
``` ```
module cubic_barbell(s=100, anchor=CENTER, spin=0, orient=UP) { module cubic_barbell(s=100, anchor=CENTER, spin=0, orient=UP) {
override = function (anchor) override = function (anchor)
anchor.x!=0 || anchor==CTR ? undef // Keep these anchor.x!=0 || anchor==CTR ? undef // Keep these
: [s/8*unit(anchor), anchor, 0]; : [s/8*unit(anchor)];
attachable(anchor,spin,orient, size=[s*3,s,s],override=override) { attachable(anchor,spin,orient, size=[s*3,s,s],override=override) {
union() { union() {
xcopies(2*s) cube(s, center=true); xcopies(2*s) cube(s, center=true);