making 3d plots

I need to generate several 3D bar graphs to visualize data that I am collecting. Basically what gnuplot generates but rendered nicely in 3D with transparency, etc.

Is there a good OpenGL plotting library that I can use. Is there already such tool in existence? I dont want a giant program with millions of options. Just a simple tool that I can automate at the command line to generate hundreds of these identical plots.

I apologize in advance for the potentially naive question!