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Allowed half_of() to work on paths, regions and surfaces.

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This commit is contained in:
Jerome Plut
2020-12-03 17:45:20 +01:00
parent 96bd60aceb
commit 16204c6724
3 changed files with 181 additions and 9 deletions
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19
mutators.scad
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@@ -118,7 +118,7 @@ module half_of(v=UP, cp, s=1000, planar=false)
}
}
function half_of(v, arg1, arg2, cp, p, s=1e4) =
function half_of(v, arg1, arg2, s=1e4, cp, p) =
/* may be called as either:
* p= cp=
* 1. (v, p) arg1 0
@@ -158,14 +158,15 @@ function half_of(v, arg1, arg2, cp, p, s=1e4) =
// create self-intersection or whiskers:
z[i]*z[j] >= 0 ? [] : [(z[j]*p[i]-z[i]*p[j])/(z[j]-z[i])]) ]
:
assert(is_region(p), str("must provide point, path or region"))
assert(len(v) == 2, str("3D vector not compatible with region"))
let(u=unit(v), w=[-u[1], u[0]],
R=[[cp+s*w, cp+s*(v+v), cp+s*(v-w), cp-s*w]]) // bounding region
intersection(R, p);
// FIXME: find something intelligent to do if p is a VNF
// FIXME: scadlib csg.scad, csg_hspace()
is_region(p) ?
assert(len(v) == 2, str("3D vector not compatible with region"))
let(u=unit(v), w=[-u[1], u[0]],
R=[[cp+s*w, cp+s*(v+v), cp+s*(v-w), cp-s*w]]) // half-plane
intersection(R, p)
:
is_vnf(p) ?
vnf_halfspace(halfspace=concat(v,[-v*cp]), vnf=p) :
assert(false, "must pass either a point, a path, a region, or a VNF");
// Module: left_half()
//