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add red sphere

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This commit is contained in:
Fabien Freling 2020-09-18 13:55:48 +02:00
parent 30d841f7c6
commit 1101f71d8f
1 changed files with 12 additions and 0 deletions
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12
in_one_weekend/src/main.zig
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@ -16,7 +16,19 @@ const SDL_WINDOWPOS_UNDEFINED = @bitCast(c_int, sdl.c.SDL_WINDOWPOS_UNDEFINED_MA
const fps = 60;
fn hitSphere(center: Point3, radius: f32, ray: Ray) bool {
const ssr = ray.origin.sub(center); // Sphere-space ray, (A - C) in book
const a = Vec3.dot(ray.direction, ray.direction);
const b = 2.0 * Vec3.dot(ssr, ray.direction);
const c = Vec3.dot(ssr, ssr) - (radius * radius);
const discriminant = b * b - 4 * a * c;
return discriminant > 0;
}
fn rayColor(ray: Ray) Color {
if (hitSphere(Point3{ .x = 0, .y = 0, .z = -1 }, 0.5, ray)) {
return Color{ .x = 1, .y = 0, .z = 0 };
}
const unitDirection = vec3.unitVector(ray.direction);
const t = 0.5 * (unitDirection.y + 1.0);
const white = Color{ .x = 1.0, .y = 1.0, .z = 1.0 };