Function gmsh_sys::gmshModelMeshGetNode

pub unsafe extern "C" fn gmshModelMeshGetNode(
    nodeTag: usize, 
    coord: *mut *mut f64, 
    coord_n: *mut usize, 
    parametricCoord: *mut *mut f64, 
    parametricCoord_n: *mut usize, 
    ierr: *mut c_int
)

Get the coordinates and the parametric coordinates (if any) of the node with tag tag. This is a sometimes useful but inefficient way of accessing nodes, as it relies on a cache stored in the model. For large meshes all the nodes in the model should be numbered in a continuous sequence of tags from 1 to N to maintain reasonable performance (in this case the internal cache is based on a vector; otherwise it uses a map).