Show HN: Reverse perspective camera for OpenGL (Three.js)

this is really neat. going to try it out with a creative coding tool I've been playing with.

are there any performance considerations to consider here relative to standard three cameras (either perspective or orthographic) ?

I've extended the standard OpenGL camera to allow smooth transition between normal perspective, orthographic, and reverse perspective projection. To demonstrate the effect, I built a demo using Three.js.

Reverse perspective can feel a bit disorienting at first, but this demo is meant to highlight a few of its interesting advantages:

1. An extended Dolly zoom effect. https://en.wikipedia.org/wiki/Dolly_zoom

You can think of it as an extrapolation of the classic Dolly zoom into negative space. It produces a cinematic sense of vertigo or sudden insight, and also lets you pull the camera back from an object without distracting the viewer with surrounding geometry.

2. A wider and more complete spatial view.

Near objects no longer obscure distant ones; the viewer can see both the façade of a building and what’s happening on its roof, or even behind it.

Code and details: https://github.com/bntre/reverse-perspective-threejs