Enum OffsetSurfaceLane 

pub enum OffsetSurfaceLane {
    Affine,
    Analytic,
    Fit,
    Reparameterised,
}

Which branch of offset_surface built a carrier — and, with it, whether comparing that carrier against the pointwise offset at the same (u, v) is even the right question.

Recorded rather than inferred, in the pattern offset/reintersect.rs established for its own two lanes: two of this function’s three branches deliberately move the result off the pointwise offset, and a measurement that did not know which branch ran would report a designed divergence as a fit error.

Variants

Affine

A rigid control-net shift of an affine (plane-like) carrier. The normal is constant, so the shifted net IS the pointwise offset — exact by construction, with no fit to measure.

Analytic

A CLOSED-FORM offset built from the source’s recognized analytic shape rather than sampled: a sphere’s concentric mate, whose net is the source’s scaled about the centre. Exact like Affine, but derived from geometry the recognizer proved rather than from a constant normal, so offset_surface_measured_sided measures it instead of declaring it.

Fit

Greville collocation of the pointwise offset. S_fit(u, v) is meant to BE offset(u, v), and the distance between them is the fit error this slice measures.

Reparameterised

The result was deliberately moved off the pointwise offset: the planar / ruled EXTENSION (which grows the carrier past its source rim, so the same (u, v) names a different point) or the apex-cone PINCH RETRIM (which pulls the crossed sample row back to the offset cone’s own apex). Both are correct and intended; neither is comparable pointwise.

Trait Implementations

impl Clone for OffsetSurfaceLane

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for OffsetSurfaceLane

impl Debug for OffsetSurfaceLane

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for OffsetSurfaceLane

fn default() -> Self

Returns the “default value” for a type.

impl Eq for OffsetSurfaceLane

impl PartialEq for OffsetSurfaceLane

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for OffsetSurfaceLane