package main

const HEIGHT = 100
const WIDTH = 200
const T_MIN = 0.001
const T_MAX = 1000

func main() {
	LOWER_LEFT_CORNER := Vec3D{-2.0, -1.0, -1.0}
	ORIGIN := Vec3D{0.0, 0.0, 0.0}
	HORIZONTAL := Vec3D{4.0, 0.0, 0.0}
	VERTICAL := Vec3D{0.0, 2.0, 0.0}

	SPHERE := Sphere{Vec3D{0.0, 0.0, -1.0}, 0.5}
	EARTH := Sphere{Vec3D{0.0, -100.5, -1.0}, 100.0}

	WORLD := HitableList{EARTH, SPHERE}
	frame := Frame{}
	for x := 0; x < HEIGHT; x++ {
		for y := 0; y < WIDTH; y++ {
			u, v := float64(y)/float64(WIDTH), float64(x)/float64(HEIGHT)
			ray := Ray{ORIGIN, AddVec3D(AddVec3D(LOWER_LEFT_CORNER, ScalarProduct(u, HORIZONTAL)), ScalarProduct(v, VERTICAL))}
			color := RayColor(ray, WORLD)
			frame[HEIGHT-1-x][y] = color.ToPixel()
		}
	}
	frame.Save("img.ppm")
}