Hello! Depending on your file format.... (e.g CSV) you may be able to use Excel or Mathematica or somesuch to transform the file, or simply write a C++ or Java program.
Generally, it's trivial to convert such a point cloud in Spherical coords to Cartesian (rectangular) coords. Let R be the radius, Psi be the angle from the up (y) axis and Theta be the angle from the x-axis (pole). This assumes right hand conventions:
x = R Cos[Theta] Sin[Psi]
y = R Cos[Psi]
z = R Sin[Theta] Sin[Psi]
Taking the point cloud into a poly mesh may be a little more work.
Cheers,
Scooba