Function gobs::cubic_surface_extractor::extract_cubic_mesh_custom

pub fn extract_cubic_mesh_custom<T, F>(
    sampler: &mut dyn Sampler<T>, 
    region: &Region, 
    mesh: &mut Mesh<CubicVertex<T>>, 
    is_quad_needed: F, 
    merge_quads: bool
) -> Option<bool> where
    T: Voxel,
    F: Fn(&T, &T) -> Option<T>,