@woosh/meep-engine/src/engine/graphics/sh3/path_tracer/make_sky_rtiw.js

Pure JavaScript game engine. Fully featured and production ready.

import { lerp } from "../../../../core/math/lerp.js";

export function make_sky_rtiw() {
    // see https://raytracing.github.io/books/RayTracingInOneWeekend.html

    return (out, out_offset, direction, direction_offset) => {

        const dir_y = direction[direction_offset + 1];
        const t = 0.5 * (dir_y + 1);

        out[out_offset] = lerp(0.5, 1, t);
        out[out_offset + 1] = lerp(0.7, 1, t);
        out[out_offset + 2] = lerp(1, 1, t);
    }
}