intrinsic parameters adjust problem

[scott198510]

In the Vanilla 3dgs code, when composing caminfo, fovx and fovy were used instead of the parameter cx and cy in the intrinsics matrix,, I'm a bit confused that it's not implemented on gsplat, as the original implementation did not use cx, cy, How can the camera coordinate system be converted to pixel during rendering? At the same time, when downscale the image, such as factor=2,4, it only adjusts the image size, while cx and cy are not processed. Why is this?