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taikomatsu/extend_curve.vfl

Created November 28, 2016 05:35
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extend curve (vex)
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extend_curve.vfl
// curveの先端を接線（というか隣のポイントとの差分）を使って伸ばす
vector p0 = point(0, "P", 0);
vector p1 = point(0, "P", 1);
vector np0 = point(0, "P", i@numpt-1);
vector np1 = point(0, "P", i@numpt-2);
vector tan_in = normalize(p0-p1);
vector tan_out = normalize(np0 - np1);
float ext = ch("ext");
addpoint(0, p0+tan_in*ext);
addpoint(0, np0+tan_out*ext);
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