> Who's https://twitter.com/ephtracy?

Unknown, they appear to like their privacy.

> Why did you create this? How are you using it this days? > Are you making any games with this?

"the project is also used as my personal research platform, so it contains codes for unpublished features and from other private projects." [0]

> Is the Ray Tracer to do that built in or do you have to import the models in a second software?

It has a built in renderer, or you can export to other tools (e.g. Unity3D) if you want more control of rendering or to be able to rotate/deform the models. I see Export options for: obj, ply, mc, xraw, slab, qb, vox, iso and 2d.

[0] https://github.com/ephtracy/ephtracy.github.io/issues/108#is...