From Divinity Engine Wiki
- call CreateSurfaceAtPosition((REAL)_X,(REAL)_Y,(REAL)_Z, (STRING)_SurfaceType, (REAL)_Radius, (REAL)_Lifetime)
- Creates a circular surface of type _SurfaceType, with a radius of _Radius meters and a lifetime of _Lifetime seconds, around the position given by _X and _Z. The _Y parameter isn't actually used because the surface is created on the AIgrid anyway.
- Use -1.0 for the _Lifetime for a permanent surface.