This is a two part question, maybe three
How can I find the middle of two points, for example; the middle of points 0-1, 1-2 etc etc.

Another option, since I have a list of vertices is finding the middle of the first two indexes of the vertices array ?

lerp 0.5 ?

or add them then mult 0.5 ?

https://www.youtube.com/watch?v=2o8EVINgoLo [www.youtube.com]

@jsmack - I wonder if bi-tangents could be used as bi-sectors ?

In the scene I've attached I want only primitive zero to rotate when using the rotation parameters within the primitive sop. Although what is happening when rotating within the primitive sop, the sphere is rotating, rather then strictly primitive zero ?

I've set primitive zero to have a pivot so to speak which is what I want the primitive to rotate from.

vusta
lerp 0.5 ?

or add them then mult 0.5 ?

would have said the same..