orient2d_3i

ifc_lite_geometry::kernel::rational

Function orient2d_3i 

Source 
pub fn orient2d_3i(
    a: &ImplicitPoint,
    b: &ImplicitPoint,
    c: &ImplicitPoint,
    axis: DropAxis,
) -> Sign
Expand description

orient2d with THREE implicit points (a,b,c), projected after axis, based on a: Λ′ = (d1·λ2_i−d2·λ1_i)(d1·λ3_j−d3·λ1_j) − (d1·λ2_j−d2·λ1_j)(d1·λ3_i−d3·λ1_i). D′ = d1²·d2·d3, so the squared d1 is dropped → den_signs = [sign(d2), sign(d3)].