It is not so bad in the narrow circumstance that the coordinates together fill a planar grid. It is only easy in the even narrower circumstance that the planar grid is along the z plane.
If this condition does not hold, then you are probably not going to be able to form an "image" in the usual sense.
Does the data represent volumetric data over a completely filled cuboid grid? Or volumetric over a sparse grid? Or is it just a set of scattered point-like objects? Or is it sampled data on a surface that should be implicitly smoothly connected to the points closest to it?
