Thanks a lot @lpea
Nevertheless I’m asking for monocular camera. The goal is to draw epilines (thus variable Z). And my main concern was since I need to know the distance Camera-ImagePlane which f to use.
Would be possible to apply the same principle to obtain the triangle sizes and angles between the camera-imagePlane-imagePixelXY.? Using fx for pixel x coordinates and fy for y pixel coordinates and them sum up the angles with the hypothenusas?
Getting closer, thanks a lot!