Last time (I don’t blame you if you forgot, that was a year and a half ago) I described the view frustum culling solution, which involved projecting the box to clip space and testing the points against plane equations there. This is more or less the solution we used at work at the time; the production version has two additional features, size culling (after the culling operation we have the clip-space extents, so we can test if the box screen-space area is too small) and occlusion culling (...
