Calculating Electric fields from a scene

[pingpongballz]

Hi, I recently stumbled upon this repository, and was wondering if it is possible to modify mitsuba to do inverse scattering problem in electromagnetics.

The problem is as such: I have a transmit antenna, and a receive antenna. The transmit antenna shoots rays into the scene, and the electric field seen by the receive antenna is $E_s = \int_{rays} f(r') dr' $, where r' is the geometrical positions of the ray intersects. I would then try to perform gradient based optimisations into this problem.

Is such an application feasible? If so, are there any limitations foreseen?

[njroussel]

Hi @pingpongballz

This is the sort of integrals that Mitsuba was made to handle, so that should not be an issue. If you haven't already, you should check out Sionna (which is built on top of Mitsuba) https://github.com/NVlabs/sionna

[pingpongballz]

Hi @njroussel,

Thank you for the reply. Would I have to modify the built-in render, or create my own rendering function in this?

[njroussel]

Yes, most likely. I'm no expert but I doubt that you'll be able to re-use all the interfaces as-is for radio simulations. However, you can also quickly string things together into your own custom renderer by using individual parts of Mitsuba as if it were just a toolbox. Maybe have a look at this tutorial: https://mitsuba.readthedocs.io/en/stable/src/rendering/scripting_renderer.html.

[pingpongballz]

Thank you @njroussel . Much appreciated 😊

[merlinND]

Hello @pingpongballz,

Instead of starting from Mitsuba, I highly recommend checking out Sionna (built on top of Mitsuba 3), as @njroussel suggested. There is extensive documentation and tutorials.