So yesterday’s attempt at capturing an image didn’t turn out so well, because I messed up the camera, or rather the vector algebra behind everything. When I realized what I had done, I instantly remembered that similar lesson from last year; because points have w=1, while vectors have w=0, almost all vector operations will get messed up by the extra 1, if you accidentally use a point instead. Or vice versa.

When fixing that I also realized I forgot to translate the camera away from the origin of the sphere I tried to take a picture of, but the vector/point mess-up had accidentally warped space to get a decent composition anyway.

typealias Transform = simd_double4x4

extension Transform {
    static func translate(to position: Point) -> Transform {

And with that, the “camera light” shaded sphere is rendered at full intensity.

White sphere