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use is_undef

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This commit is contained in:
Justin Lin
2021-06-20 17:15:42 +08:00
parent d0acef0cf8
commit db9a43e073
1 changed files with 5 additions and 5 deletions
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10
src/surface/sf_thicken.scad
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@@ -16,12 +16,12 @@ module sf_thicken(points, thickness, direction = undef, slicing = "SLASH") {
vi0 = xy,
vi1 = vi[i],
vi2 = vi[(i + 1) % 4],
v1 = sf[vi0[1]][vi0[0]],
v2 = sf[vi1[1]][vi1[0]],
v3 = sf[vi2[1]][vi2[0]]
v0= sf[vi0[1]][vi0[0]],
v1 = sf[vi1[1]][vi1[0]],
v2 = sf[vi2[1]][vi2[0]]
)
if(v1 != undef && v2 != undef && v3 != undef)
tri_normal([v1, v2, v3])
if(!(is_undef(v0) || is_undef(v1) || is_undef(v2)))
tri_normal([v0, v1, v2])
]
)
sum(normals) / len(normals);