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fix rounded_prism "prismoid" anchor type

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Adrian Mariano
2025-03-26 18:32:31 -04:00
parent d06a27503e
commit 1e81b28f5c
1 changed files with 25 additions and 3 deletions
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28
rounding.scad
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@@ -2283,7 +2283,17 @@ module rounded_prism(bottom, top, joint_bot=0, joint_top=0, joint_sides=0, k_bot
unrounded = vnf_vertex_array([top,bottom],caps=true, col_wrap=true,reverse=true);
vnf = result[1];
geom = atype=="prismoid" ? attach_geom(size=[1,1,1],anchors=result[2], override=result[3])
geom = atype=="prismoid" ?
let(
botbounds = pointlist_bounds(bottom),
topbounds = pointlist_bounds(top),
allz = column(concat(bottom,top),2),
height = max(allz)-min(allz),
size = [botbounds[1].x-botbounds[0].x, botbounds[1].x-botbounds[0].x, height],
size2 = [topbounds[1].x-topbounds[0].x, topbounds[1].x-topbounds[0].x],
shift = point2d(mean(topbounds)-mean(botbounds))
)
attach_geom(size=size, size2=size2, shift=shift,anchors=result[2], override=result[3])
: in_list(atype,["hull","intersect"]) ? attach_geom(vnf=unrounded, extent=atype=="hull", cp=cp, anchors=result[2])
: attach_geom(vnf=vnf, extent=atype=="surf_hull", cp=cp, anchors=result[2]);
attachable(anchor=anchor, spin=spin, orient=orient, geom=geom)
@@ -2458,6 +2468,7 @@ function rounded_prism(bottom, top, joint_bot=0, joint_top=0, joint_sides=0, k_b
debug ? vnf_from_polygons(faces,fast=true)
: vnf_triangulate(vnf_from_polygons(faces))
]),
topnormal = unit(cross(top[0]-top[1],top[2]-top[1])),
botnormal = -unit(cross(bottom[0]-bottom[1],bottom[2]-bottom[1])),
sidenormal = [for(i=idx(top))
@@ -4119,7 +4130,19 @@ function _prism_fillet_prism(name, basepoly, bot, top, d, k, N, overlap, uniform
// let(sweep=parent())
// move([24,-22,20]) sphere(d=10)
// prism_connector(circle(r=2.2,$fn=32), sweep, CTR, parent(),CTR, fillet=2);
// Example: The {{rounded_prism()}} module supplies anchors for its faces and edges that you can use with this module. It also has an `atype="prismoid"` anchor type, which provides a prismoid geometry object. This prismoid geometry is sometimes not accurate enough to find center anchors of rounded prism objects. It will work properly only if your object could be constructed (without rounding) by the {{prismoid()}} module. Here is an example where it works correctly. Note that the top and bottom are rectangular and parallel to the XY plane.
// ellipse = ellipse([2,1.5],$fn=64);
// cuboid([40,40,5]) let(cubeframe=parent())
// align(TOP,LEFT)
// rounded_prism(top=rect([10,15]), bottom=rect([14,21]), height=13,
// joint_sides=3, joint_top=3, atype="prismoid",anchor=BOT)
// let(first=parent())
// restore(cubeframe)
// align(TOP,RIGHT+BACK)
// rounded_prism(top=rect([10,15]), bottom=rect([14,21]), height=17,
// joint_sides=3, joint_top=3, atype="prismoid",anchor=BOT)
// let(second=parent())
// prism_connector(ellipse, first, CTR, parent(), CTR, fillet=2);
// Example: Connecting to edges. In this example the triangular prism is aligned with object1, the big cube, so its corner is at the edge. You can't align it with both edges at the same time; that would requires twisting the prism.
// $fn=32;
// tri = subdivide_path(round_corners([[-3,-2],[0,5],[3,-2]], cut=1), maxlen=1,closed=true);
@@ -4223,7 +4246,6 @@ function _prism_fillet_prism(name, basepoly, bot, top, d, k, N, overlap, uniform
// desc_copies(arc_copies(rx=85,ry=45,n=12))
// cyl(d=15,h=27,circum=true,rounding=5,$fn=64)
// prism_connector(circle(r=3,$fn=32), parent(), CTR, $next(), CTR, fillet=4);
// Example(3D,Med): When using {{desc_copies()}} with a varying shape you have to conditionally show only the correct shape for each index, but still specify all the shapes so you can collect their descriptions.
// circ = circle(r=3, $fn=64);
// desc_copies(arc_copies(rx=60,ry=80,n=5,sa=-20,ea=200))