Function gmsh_sys::gmshModelGetValue

pub unsafe extern "C" fn gmshModelGetValue(
    dim: c_int, 
    tag: c_int, 
    parametricCoord: *mut f64, 
    parametricCoord_n: usize, 
    points: *mut *mut f64, 
    points_n: *mut usize, 
    ierr: *mut c_int
)

Evaluate the parametrization of the entity of dimension dim and tag tag at the parametric coordinates parametricCoord. Only valid for dim equal to 0 (with empty parametricCoord), 1 (with parametricCoord containing parametric coordinates on the curve) or 2 (with parametricCoord containing pairs of u, v parametric coordinates on the surface, concatenated: [p1u, p1v, p2u, ...]). Return triplets of x, y, z coordinates in points, concatenated: [p1x, p1y, p1z, p2x, ...].