Actually, I think that doing a bunch of segments wouldn't work since every
time I add a new segment, it would not properly intersect with the last
one.
I would need some type of function to "round the corner" between one
segment
and the next. :(
So I guess that answers my question. Unless there is some other way to
make
an arc. Unfortunately, it looks like rotate_extrude() is limited to only
doing a full 360 degrees and no partial. At least the documentation
doesn't
seem to indicate that it is possible...
I've done things like this in the past (to make a tubular arc in the case
below) by doing a rotate_extrude (to make a torus) and finding the
intersection of that and a wedge shape made by linear_extruding a sort of
fanning polygon that starts at the centre of the rotation and expands
around the outside of the torus. You could probably adapt that to your
needs.
$fn=64;
pipebend (4,3,20,135);
module pipebend (thickness, id, od, ang)
intersection (){
difference(){
torus (thickness, od);
torus (id,od);
}
wedge (thickness, (od+thickness)/1.7,ang);
}
// ********************** End of Module ******************
module torus (thickness, dia,)
rotate_extrude(convexity = 10) translate([dia/2, 0, 0]) circle(r =
thickness/2) ;
// ********************** End of Module ******************
module wedge (thickness, rad, ang)
translate ([0,0,-(thickness/2)-1]) {
linear_extrude (height = thickness+2) {
polygon(points=[
[radcos(ang/2),-radsin(ang/2)],
[0,0],
[radcos(ang/2),radsin(ang/2)],
[radcos(ang/3),radsin(ang/3)],
[radcos(ang/6),radsin(ang/6)],
[rad,0],
[radcos(ang/6),-radsin(ang/6)],
[radcos(ang/3),-radsin(ang/3)]],
paths=[[0,1,2,3,4,5,6,7]]);}
}
// ********************** End of Module ******************
--
Stand firm for what you believe in, until and unless logic and experience
prove you wrong. Remember: when the emperor looks naked, the emperor is
naked, the truth and a lie are not "sort-of the same thing" and there is
no aspect, no facet, no moment of life that can't be improved with pizza.
-Daria Morgendorffer
