It's the same thing! What are you trying to do with it?
One thing you'll run into is that there isn't a clear frequency response curve for non-visible, so you need to invent your own frequency to RGB function (false color).
Another thing is that radio waves have much longer wavelengths than visible, so diffractive effects tend to be a lot more important, and ray tracing (spectral or otherwise) doesn't do this well. Modeling diffraction is typically done using something like FDTD.
I'm no RF guy, but I imagine you quickly will have to care about areas where the wavelike properties of EM radiation dominates, in which case ray tracing is not the right tool for the job.
Comments
Are there any good resources for spectral ray tracing for other frequencies of light, e.g. radio frequencies?
It's the same thing! What are you trying to do with it?
One thing you'll run into is that there isn't a clear frequency response curve for non-visible, so you need to invent your own frequency to RGB function (false color).
Another thing is that radio waves have much longer wavelengths than visible, so diffractive effects tend to be a lot more important, and ray tracing (spectral or otherwise) doesn't do this well. Modeling diffraction is typically done using something like FDTD.
https://en.wikipedia.org/wiki/Finite-difference_time-domain_...
What are the applications you have in mind?
I'm no RF guy, but I imagine you quickly will have to care about areas where the wavelike properties of EM radiation dominates, in which case ray tracing is not the right tool for the job.