Confusing issue when moving points in the renderlist

Expanding and utilizing the engine via C++.
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Joined: Fri Oct 02, 2015 1:03 am
by JackStone » Wed Oct 05, 2016 2:17 am
Hello, thank you for your reply.

I had a good look at that link, and I do think it helped a lot.

It is possible that I am closer than I thought.

I actually have code that rotates a point (using Rodrigues' rotation formula). However, this seems to rotate about the wrong origin point.

I think if I could translate the nodes back to the origin, rotate them, then translate them again by the same distance, I could accomplish the rotation.
The angle to rotate by seems to be given by the code you posted.

Wikipedia says about Rodrigues formula:

"By extension, this can be used to transform all three basis vectors to compute a rotation matrix in SO(3), the group of all rotation matrices, from an axis–angle representation"

So, this should work... I will give it a go as soon as I can, and post an update either way, thanks again!
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