Coding challenge

A torus (donut shape) can be described parametrically with two angles $u$ and $v$ (both ranging from $0$ to $2\pi$), a ring radius $R = 30$, and a tube radius $r = 10$: $$x = (R + r\cos(v))\cos(u)$$ $$y = (R + r\cos(v))\sin(u)$$ $$z = r\sin(v)$$ Using nested for-loops, step $u$ and $v$ around $0$ to $2\pi$ and draw small spheres with sphere(x, y, z, 1.5, "ffaa00"). Call scene3d() at the start.

Try adding spin(20) at the end to watch your 3D donut rotate in the viewport!

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