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Speed improvement for volume and centroid.

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This commit is contained in:
Adrian Mariano 2020-03-30 19:17:27 -04:00
parent 857e7a94fb
commit 49603a4fed
1 changed files with 13 additions and 8 deletions
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21
vnf.scad
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@ -345,6 +345,9 @@ module vnf_polyhedron(vnf, convexity=2) {
}
// Function: vnf_volume()
// Usage:
// vol = vnf_volume(vnf);
@ -353,13 +356,14 @@ module vnf_polyhedron(vnf, convexity=2) {
// 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) =
let(vnf = vnf_triangulate(vnf))
sum([
for(face_index=vnf[1]) let(
face = select(vnf[0], face_index),
n = cross(face[2]-face[0],face[1]-face[0])
) face[0] * n
])/6;
let(vnf = vnf_triangulate(vnf),
vert=vnf[0])
sum([
for(face_index=vnf[1]) let(
face = select(vert, face_index),
n = cross(face[2]-face[0],face[1]-face[0])
) face[0] * n
])/6;
// Function: vnf_centroid()
@ -373,10 +377,11 @@ function vnf_volume(vnf) =
function vnf_centroid(vnf) =
let(
vnf = vnf_triangulate(vnf),
vert = vnf[0],
val=sum([
for(face_index=vnf[1])
let(
face = select(vnf[0], face_index),
face = select(vert, face_index),
n = cross(face[2]-face[0],face[1]-face[0])
) [
face[0] * n,