Enum Structural2dElements 

pub enum Structural2dElements<'a> {
    Quad4(&'a [[usize; 4]]),
    Quad9(&'a [[usize; 9]]),
}

Borrowed element-connectivity input for model assembly.

Each variant stores element-node connectivity in the node ordering expected by the corresponding quadrilateral family. Element corner nodes must be ordered counter-clockwise in the 2D analysis plane.

Variants

Quad4(&'a [[usize; 4]])

Four-node bilinear quadrilateral connectivity in local corner order.

Quad9(&'a [[usize; 9]])

Nine-node quadratic quadrilateral connectivity in local corner, midside, center order.