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check if coplanar

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This commit is contained in:
Justin Lin 2022-08-22 23:38:18 +08:00
parent 824168a006
commit d29ab4eb8a
1 changed files with 2 additions and 1 deletions
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src/__comm__/__line_intersection.scad
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@ -31,7 +31,8 @@ function __line_intersection3(line_pts1, line_pts2, ext, epsilon = 0.0001) =
b = b2 - b1,
c = cross(a, b)
)
norm(c) < epsilon ? [] : // they are parallel or conincident edges
cross(a, b1 - a1) * (b2 - a1) != 0 || // they aren't coplanar
norm(c) < epsilon ? [] : // they are parallel or conincident edges
let(
t = v_scalar(cross(b1 - a1, b), c),
p = a1 + a * t