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Added octahedron(), fixed bug in VNF extent anchoring.

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Garth Minette 2021-10-24 15:26:27 -07:00
parent 3cf00d8fd7
commit cbab1b9a61
3 changed files with 44 additions and 14 deletions
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6
attachments.scad
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@ -1649,10 +1649,8 @@ function _find_anchor(anchor, geom) =
rpts = apply(rot(from=anchor, to=RIGHT) * move(point3d(-cp)), vnf[0]),
maxx = max(columns(rpts,0)),
idxs = [for (i = idx(rpts)) if (approx(rpts[i].x, maxx)) i],
mm = pointlist_bounds(select(rpts,idxs)),
avgy = (mm[0].y+mm[1].y)/2,
avgz = (mm[0].z+mm[1].z)/2,
mpt = approx(point2d(anchor),[0,0])? [maxx,0,0] : [maxx, avgy, avgz],
avep = sum(select(rpts,idxs))/len(idxs),
mpt = approx(point2d(anchor),[0,0])? [maxx,0,0] : avep,
pos = point3d(cp) + rot(from=RIGHT, to=anchor, p=mpt)
) [anchor, pos, anchor, oang]
) : type == "rect"? ( //size, size2, shift

14
masks.scad
View file

@ -70,17 +70,11 @@ module chamfer_edge_mask(l=1, chamfer=1, excess=0.1, anchor=CENTER, spin=0, orie
// corner_mask(TOP+FWD+RIGHT)
// chamfer_corner_mask(chamfer=20);
// }
// Example: Anchors
// chamfer_corner_mask(chamfer=20)
// show_anchors();
module chamfer_corner_mask(chamfer=1, anchor=CENTER, spin=0, orient=UP) {
pts = 2 * chamfer * [
[0,0,1], [1,0,0], [0,1,0], [-1,0,0], [0,-1,0], [0,0,-1]
];
faces = [
[0,2,1], [0,3,2], [0,4,3], [0,1,4], [5,1,2], [5,2,3], [5,3,4], [5,4,1]
];
attachable(anchor,spin,orient, size=[4,4,4]*chamfer) {
polyhedron(pts, faces, convexity=2);
children();
}
octahedron(chamfer*4, anchor=anchor, spin=spin, orient=orient) children();
}

38
shapes3d.scad
View file

@ -641,6 +641,44 @@ function prismoid(
) reorient(anchor,spin,orient, size=[s1.x,s1.y,h], size2=s2, shift=shift, p=vnf);
// Function&Module: octahedron()
// Usage: As Module
// octahedron(size, ...);
// Usage: With Attachments
// octahedron(size, ...) { attachments }
// Usage: As Function
// vnf = octahedron(size, ...);
// Description:
// When called as a module, creates an octahedron with axis-aligned points.
// When called as a function, creates a [[VNF|vnf.scad]] of an octahedron with axis-aligned points.
// Arguments:
// size = Width of the octahedron, tip to tip.
// ---
// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#anchor). Default: `CENTER`
// spin = Rotate this many degrees around the Z axis after anchor. See [spin](attachments.scad#spin). Default: `0`
// orient = Vector to rotate top towards, after spin. See [orient](attachments.scad#orient). Default: `UP`
// Example:
// octahedron(size=40);
// Example: Anchors
// octahedron(size=40) show_anchors();
module octahedron(size=1, anchor=CENTER, spin=0, orient=UP) {
vnf = octahedron(size=size);
attachable(anchor,spin,orient, vnf=vnf, extent=true) {
vnf_polyhedron(vnf, convexity=2);
children();
}
}
function octahedron(size=1, anchor=CENTER, spin=0, orient=UP) =
let(
s = size / 2,
vnf = [
[ [0,0,s], [s,0,0], [0,s,0], [-s,0,0], [0,-s,0], [0,0,-s] ],
[ [0,2,1], [0,3,2], [0,4,3], [0,1,4], [5,1,2], [5,2,3], [5,3,4], [5,4,1] ]
]
) reorient(anchor,spin,orient, vnf=vnf, extent=true, p=vnf);
// Module: rect_tube()
// Usage: Typical Rectangular Tubes
// rect_tube(h, size, isize, [center], [shift]);