Enum GeomTransf3 

pub enum GeomTransf3 {
    Linear3 {
        vec_xz: [f64; 3],
    },
    PDelta3 {
        vec_xz: [f64; 3],
    },
}

GeomTransf’s spatial counterpart: builds a member’s local basis and local↔global rotation from its two end-node coordinates and an orientation vector (vec_xz): x = normalize(pJ - pI), y = normalize(vec_xz × x), z = x × y). Unlike planar GeomTransf, this isn’t just a behavior flag: the local-axis construction is real, nontrivial, and shared by every spatial frame element (ElasticBeamColumn3 today; DispBeamColumn3/ForceBeamColumn3 will reuse it once they exist), so it’s a real type rather than something each element inlines a copy of. Verified against Xara’s LinearCrdTransf3d.

Linear3 and PDelta3 are both “cheap” per the same reasoning as planar GeomTransf’s doc comment — full spatial corotational geometry is not yet supported, so it is not a third variant here.

Variants

Linear3

Small-displacement: local/global relationship fixed at the member’s original (undeformed) orientation, no correction for the effect of axial force on bending stiffness.

Fields

vec_xz: [f64; 3]

A vector not parallel to the member axis, fixing the local y/z orientation (roll) — not a physical direction. E.g. [0.0, 0.0, 1.0] (global z) for a horizontal member picks local z as the in-plane bending axis for gravity loads.

PDelta3

Same small-displacement geometry as Linear3, plus a linearized geometric-stiffness correction from the current axial force in both bending planes (a first-order P-Delta effect) — not full corotational tracking. See ElasticBeamColumn3::geometric_stiffness for the actual correction; this variant only selects it.

Fields

vec_xz: [f64; 3]

Implementations

impl GeomTransf3

pub fn linear(vec_xz: [f64; 3]) -> Self

pub fn p_delta(vec_xz: [f64; 3]) -> Self

Trait Implementations

impl Clone for GeomTransf3

fn clone(&self) -> GeomTransf3

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for GeomTransf3

impl Debug for GeomTransf3

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

Formats the value using the given formatter.

impl PartialEq for GeomTransf3

fn eq(&self, other: &GeomTransf3) -> bool

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for GeomTransf3