Hi there, I would like to check how to calculate focal length (in pixels) for Fisheye Polynomial cameras.
When I created a fisheyePolynomial camera in Isaac Sim, I noticed that there are 4 polynomial coefficients that I can set, namely, Poly k0, Poly k1, Poly k2, Poly k3, Poly k4, Poly k5. According to the Nvidia F-Theta model document, could I check if these coefficients are according to the forward or backward projection model? For example, if my Poly k1 is 0.00225 and my other coefficients are 0, how can I calculate the focal length of the rendered camera image in pixels?
I also noticed that there is a Max FOV parameter in the fisheye lens parameters for this camera. I tinkered with its value and noticed that the FOV of the camera increases with a higher value as expected. Would this value also affect the coefficients of the f-theta model?