Turns out there was shadow acne in the box scene in my original implementation as well, I just hadnt seen it. Heres the better version that has bias as in my previous simple-scene submission.

Fixed acne issue in simple scene by adding bias to the shaded point in the normal direction. Also checked that this doesnt add new acne in the box scene.

Okay now the box scene works. I was calling the wrong function.

The box scene is not so good though, so Ill be working on that.

Once I got my code to actually compile, the simple scene turned out great.