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Change VNF hull anchors to point in more rational directions

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Adrian Mariano 2024-09-01 21:21:24 -04:00
parent d897c42a3c
commit ef610906b0
2 changed files with 57 additions and 1 deletions
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34
attachments.scad
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@ -3742,10 +3742,42 @@ function _find_anchor(anchor, geom) =
rpts = apply(rot(from=anchor, to=RIGHT) * move(point3d(-cp)), vnf[0]),
maxx = max(column(rpts,0)),
idxs = [for (i = idx(rpts)) if (approx(rpts[i].x, maxx)) i],
dir = len(idxs)>2 ? [anchor,oang]
: len(idxs)==2 ?
let(
edgefaces = _vnf_find_edge_faces(vnf,idxs),
edge = select(vnf[0],idxs)
)
len(edgefaces)==0 ? [anchor,oang]
: assert(len(edgefaces)==2, "Invalid polyhedron encountered while computing VNF anchor")
edge[0]==edge[1] ? [anchor,oang] // two "edge" points are the same, so give up
: let(
direction= unit(mean([for(face=edgefaces) polygon_normal(select(vnf[0],vnf[1][face]))])),
edgedir = edge[1]-edge[0],
nz = [for(i=[0:2]) if (!approx(edgedir[i],0)) i],
flip = last(nz) < 0 ? -1 : 1,
spin = _compute_spin(direction, flip*edgedir)
)
[direction,spin]
: let(
vertices = vnf[0],
faces = vnf[1],
cornerfaces = _vnf_find_corner_faces(vnf,idxs[0]), // faces = [3,9,12] indicating which faces
normals = [for(faceind=cornerfaces) polygon_normal(select(vnf[0], faces[faceind]))],
angles = [for(faceind=cornerfaces)
let(
thisface = faces[faceind],
vind = search(idxs[0],thisface)[0]
)
vector_angle(select(vertices, select(thisface,vind-1,vind+1)))
],
direc = unit(angles*normals)
)
[direc, atan2(direc.y,direc.x)+90],
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, default(override[0],pos),default(override[1],anchor),default(override[2],oang)]
) [anchor, default(override[0],pos),default(override[1],dir[0]),default(override[2],dir[1])]
) : type == "trapezoid"? ( //size, size2, shift, override
let(all_comps_good = [for (c=anchor) if (c!=sign(c)) 1]==[])
assert(all_comps_good, "All components of an anchor for a rectangle/trapezoid must be -1, 0, or 1")

24
vnf.scad
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@ -2331,5 +2331,29 @@ module vnf_validate(vnf, size=1, show_warns=true, check_isects=false, opacity=0.
}
function _vnf_find_edge_faces(vnf,edge) =
let(
faces = vnf[1],
goodind = [for(i=idx(faces))
let(result=search(edge,faces[i]))
if (result*0==[0,0] &&
(abs(result[0]-result[1])==1
|| (min(result)==0 && max(result)==len(faces[i])-1)))
i
]
)
goodind;
function _vnf_find_corner_faces(vnf,corner) =
let(
faces = vnf[1]
)
[for(i=idx(faces))
let(result=search([corner],faces[i])[0])
if (result!=[])
i];
// vim: expandtab tabstop=4 shiftwidth=4 softtabstop=4 nowrap