Sweeping — API

Source: src/ut_mesh.scad. A region swept along stations becomes one polyhedron, with no CSG.

Modules

ut_tube(path, prof, part = "solid", opts = [])	Sweeps one run. Runs ut_check first. part is "solid" (the finished wall), "shell" (the outside, filled) or "bore" (the bore as a solid); any other value is an error. opts are frame options.
ut_sweep(rgn, sts, closed = false, open = false)	The underlying sweep: a region along a station list. closed wraps the last station to the first and omits end caps. open adds the two seam walls of a split section.

Functions

	returns
ut_run_volume(path, prof, part = "solid", opts = [])	the volume of the mesh ut_tube would emit, without rendering it
ut_run_ports(path, prof, name = "run", opts = [])	the two end ports of a single run, named name.a and name.b
ut_part_rgn(prof, part)	the region a part name selects
ut_place(st, q)	a 2D profile point q placed in station st: p + q[0]*n + q[1]*cross(t, n)
ut_mesh_points(rgn, sts, closed = false)	the vertex list
ut_mesh_faces(rgn, sts, closed = false, open = false)	the face list. Every face is a triangle.

ut_mesh_faces winds each face counter-clockwise seen from outside, so the right-hand rule gives the outward normal and ut_volume is positive. polyhedron() wants the opposite, clockwise from outside, and ut_sweep reverses every face as it emits. If you call polyhedron() on these yourself, reverse them too: [for (f = faces) [f[2], f[1], f[0]]].

With ut_volume they let a test measure a mesh as data:

sts = ut_stations(path);
rgn = ut_solid_rgn(prof);
echo(ut_volume(ut_mesh_points(rgn, sts), ut_mesh_faces(rgn, sts)));