Wave Simulation with Python

I want to simulate a propagating wave with absorption and reflection on some bodies in three dimensional space. I want to do it with python. Should I use numpy? Are there some special libraries I should use?

How can I simulate the wave? Can I use the wave equation? But what if I have a reflection? Is there a better method? Should I do it with vectors? But when the ray diverge the intensity gets lower. Difficult.

Thanks in advance.