How to visualize a pdb-like file

[Horacio horacio at um.es]

Hi everybody.

I have a pdb-like file which represents the model of a molecule.

The exact format is the following:

x1, y1, z1, r1
.
.
.
xn, yn, zn, rn

where each line corresponds to each bead of the model and it describes the
Cartesian coordinates of the bead and its radius.

My questions are:

Does anybody know how to visualize this file in a similar way that in rasmol
you can visualize a pdb structure ?

or

Does anybody know how to convert this file to a pdb (or pdb-like) format ?

Thanks !