/// Draw a cloud of points for 3d data
void mgl_cloudp(HMGL gr, const HMDT a, const char *sch, mreal alpha)
{ if(gr && a) gr->CloudP(*a, sch, alpha); }
/// Draw a cloud of points for 3d data specified parametrically
void mgl_cloudp_xyz(HMGL gr, const HMDT x, const HMDT y, const HMDT z, const HMDT a,
const char *sch, mreal alpha)
{ if(gr && a && x && y && z) gr->CloudP(*x, *y, *z, *a, sch, alpha); }