How do the symbols r, o, and i related to the polar coordinates (Rho, Phi, and Theta) [closed]
Solution 1:
You can look at the cartesian transformation that he uses to tell what the angles are.
// convert back to cartesian coordinates
w.x = wr * sin(wo)*sin(wi);
w.y = wr * cos(wo);
w.z = wr * sin(wo)*cos(wi);
On the other hand, the typical representation (matching your picture) is
$$x = r\sin(\theta)\cos(\varphi) \\ y = r\sin(\theta)\sin(\varphi) \\ z = r\cos(\theta)$$
So he is using o for $\theta$ and i for $\varphi$, but his cartesian coordinates are flipped in the sense that w.x is really $y$, w.y is really $z$, and w.z is really $x$.