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partials

axiolid_reference

Function partials 

Source 
pub fn partials(
    surface: &Surface,
    u: f64,
    v: f64,
) -> Result<(DVec3, DVec3), GeomError>
Expand description

Analytic first partial derivatives (∂S/∂u, ∂S/∂v) at (u, v).

Rational B-spline derivatives are evaluated in homogeneous space and projected with the quotient rule. This remains stable when valid imported knot domains have large offsets that make finite-difference steps vanish.