pub fn surface_area(
vertices: &[Point3],
triangles: &[[u32; 3]],
) -> Result<f64, MeshMeasureError>Expand description
Total surface area = Σ ½‖(b − a) × (c − a)‖ over every triangle.
Independent of winding (uses the cross-product magnitude). Degenerate
(zero-area / collinear) triangles contribute exactly 0. Deterministic: identical
input → bit-identical result (fixed summation order = the triangle order).