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Bugfix for bezier_segment_length() for unusual bezier curves.

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Revar Desmera 2020-03-06 17:28:58 -08:00
parent 6ec5013835
commit b048570f7a
2 changed files with 20 additions and 11 deletions
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29
beziers.scad
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@ -161,17 +161,26 @@ function bezier_segment_closest_point(curve, pt, max_err=0.01, u=0, end_u=1) =
// echo(bezier_segment_length(bez));
function bezier_segment_length(curve, start_u=0, end_u=1, max_deflect=0.01) =
let(
mid_u=lerp(start_u, end_u, 0.5),
sp = bez_point(curve,start_u),
bez_mp = bez_point(curve,mid_u),
ep = bez_point(curve,end_u),
lin_mp = lerp(sp,ep,0.5),
defl = norm(bez_mp-lin_mp)
segs = len(curve) * 2,
path = [
for (i=[0:1:segs])
let(u=lerp(start_u, end_u, i/segs))
bez_point(curve,u)
],
defl = max([
for (i=idx(path,end=-3)) let(
mp = (path[i] + path[i+2]) / 2
) norm(path[i+1] - mp)
]),
mid_u = lerp(start_u, end_u, 0.5)
)
((end_u-start_u) >= 0.125 || defl > max_deflect)? (
bezier_segment_length(curve, start_u, mid_u, max_deflect) +
bezier_segment_length(curve, mid_u, end_u, max_deflect)
) : norm(ep-sp);
defl <= max_deflect? path_length(path) :
sum([
for (i=[0:1:segs-1]) let(
su = lerp(start_u, end_u, i/segs),
eu = lerp(start_u, end_u, (i+1)/segs)
) bezier_segment_length(curve, su, eu, max_deflect)
]);

2
version.scad
View File

@ -8,7 +8,7 @@
//////////////////////////////////////////////////////////////////////
BOSL_VERSION = [2,0,163];
BOSL_VERSION = [2,0,164];
// Section: BOSL Library Version Functions