render_path_spiral

Hi,

I saw there are some differences between your code and orignal nerf code in render_path_spirial.

original:
`c = np.dot(c2w[:3,:4], np.array([np.cos(theta), -np.sin(theta), -np.sin(theta*zrate), 1.]) * rads)`

your code:
`center = np.array([np.cos(t), -np.sin(t), -np.sin(0.5*t)]) * radii `

Can you explain why they do `np.dot` between `c2w[:3,:4]` and `np.array([np.cos(theta), -np.sin(theta), -np.sin(theta*zrate), 1.]) * rads)` ?

Thanks

Locate the render_path_spirial implementation and compare the two expressions shown in the issue, starting with the coordinate and pose representations used by c2w and radii. Done means documenting why the original uses np.dot and how that differs from the current center calculation.

Written by the indexing model from the issue text.