In the Vignetting diagram analysis, the doc states :
“Ray Density The Ray Density specifies the number of rays to be traced. The more rays traced, the greater the accuracy, although the computation time increases. For a Ray Density of n, OpticStudio traces a grid of (2n+1) x (2n + 1) Rays at each Field Point. The Ray Density minimum value is 5.”
It also mentions that “This feature is appropriate for rotationally symmetric lenses”.
My qyestion then is how is the grid of rays generated with (2n+1)x(2x+1) rays on a circular pupil ? A square grid is generated, and the rays outside the inscribed circle are dropped before the ray tracing ? in other words, about (2n+1)*(2n+1)*pi/4 rays are actually used ?
