openscad/BOSL2
1
0
Fork 0
mirror of https://github.com/revarbat/BOSL2.git synced 2025-08-06 17:26:46 +02:00
Code Issues Projects Releases Wiki Activity

Added clarifying docs to vnf_centroid and vnf_volume. Changed vsqr to sqr

Browse Source
This commit is contained in:
Adrian Mariano
2020-03-21 09:19:02 -04:00
parent 20c6e0fe72
commit 79358ddf6f
1 changed files with 8 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
vnf.scad
View File

@@ -340,7 +340,9 @@ module vnf_polyhedron(vnf, convexity=2) {
// Usage: // Usage:
// vol = vnf_volume(vnf); // vol = vnf_volume(vnf);
// Description: // Description:
// Returns the volume enclosed by the given manifold VNF. May return a negative value if faces are reversed. // Returns the volume enclosed by the given manifold VNF. The VNF must describe a valid polyhedron with consistent face direction and
// no holes; otherwise the results are undefined. Returns a positive volume if face direction is clockwise and a negative volume
// if face direction is counter-clockwise.
function vnf_volume(vnf) = function vnf_volume(vnf) =
let(vnf = vnf_triangulate(vnf)) let(vnf = vnf_triangulate(vnf))
sum([ sum([
@@ -355,7 +357,8 @@ function vnf_volume(vnf) =
// Usage: // Usage:
// vol = vnf_centroid(vnf); // vol = vnf_centroid(vnf);
// Description: // Description:
// Returns the centroid of the given manifold VNF. // Returns the centroid of the given manifold VNF. The VNF must describe a valid polyhedron with consistent face direction and
// no holes; otherwise the results are undefined.
function vnf_centroid(vnf) = function vnf_centroid(vnf) =
let( let(
vnf = vnf_triangulate(vnf), vnf = vnf_triangulate(vnf),
@@ -367,9 +370,9 @@ function vnf_centroid(vnf) =
) [ ) [
face[0] * n, face[0] * n,
vmul(n, vmul(n,
vsqr(face[0] + face[1]) + sqr(face[0] + face[1]) +
vsqr(face[0] + face[2]) + sqr(face[0] + face[2]) +
vsqr(face[1] + face[2]) sqr(face[1] + face[2])
) )
] ]
]) ])