2D height map to 3D model?

[PhilC]

Hi Folks,

I'm looking to write a Python script that will take a 2D BMP (or
height map) and translate it into a 3D model in OBJ format.

Something of a challenge for me but if it were easy life would be
boring :)

Does anyone know if such a script already exists?
Or any pointers would be appreciated.

Thanks,

PhilC