raytracing1.ts

import Playground from "./playground";
const pg = new Playground();

const sphere = {
    position: [0, .5, -3],
    radius: 1.23
}
pg.visCamera(-1);
pg.gridXZ()

const o = [0, 0, 0]
const co = ... // O - C

const step = 1 / 8

for (let yCoord = -1; yCoord <= 1; yCoord +=  step) {

    for (let xCoord = -1; xCoord <= 1; xCoord +=  step) {

        const v = [xCoord, yCoord, -1]
        const ov = ... // V - O

        pg.visVector(ov)

        const a = ... // <---- see equations above
        const b = ... // <---- see equations above
        const c = ... // <---- see equations above
 
        const discriminant = ... // <---- see equations above

        const t1 = (-b + Math.sqrt(discriminant)) / (2 * a)
        const t2 = (-b - Math.sqrt(discriminant)) / (2 * a)
        
        if (t1) {
            pg.visPoint(vecMultiplyScalar(t1, v),{color:"red"});
        }

        if (t2) {
            pg.visPoint(vecMultiplyScalar(t2, v),{color:"blue"});
        }

    }
}