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Cardinal SplineA cardinal spline is a cubic Hermite spline whose tangents are defined by the points and a tension parameter. Given n+1 points - p0, ..., pn,
to be interpolated with n cubic Hermite curve segments, for each curve we have a starting point pi and an ending point pi+1 with starting tangent mi and ending tangent mi+1 with the tangents defined by -
where the first and last tangent m0 and mn are given and c is a constant that modifies the length of the tangent.
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