[dahart]

Fish eye is a feature! ;) https://strlen.com/gfxengine/fisheyequake/

I noticed it in the examples too, I’m speculating wildly that the ray cast is even angular steps rather than pinhole projection. Totally reasonable to not correct it, IMO, I’ve long thought we should have more non-linear cameras in games.

[a_e_k]

That's exactly what it's doing:

    let rayAngle = player.angle - player.fieldOfView / 2;
    for(let rayCount = 0; rayCount < screen.width; rayCount++) {

      // ... SNIP ...

      // the ray moves at constant increments
      let rayCos = Math.cos(degreeToRadians(rayAngle)) / precision;
      let raySin = Math.sin(degreeToRadians(rayAngle)) / precision;

      // ... SNIP ...

      // increment the angle for the next ray
      rayAngle += incrementAngle;
    }

It's also using Euclidean distance rather than planar distance for the apparent wall height calculation.