Trying to make a plane rotate around a sphere it is tangent to

Grasshopper
1

Hi, I want to make a series of clipping planes that I can use on an object. Everything with the clipping is working fine. Where I’ve run into trouble is rotating the planes in 3D around the object (I want to be able to reposition the clipping planes).

In this definition the object is a box (it’ll be the bounding box for my mesh object). I tried making two circles around the centroid, hoping to set up something like a spherical coordinate system.

The problem is that there are places where the vector snaps 180 degrees. I’m not sure what is causing this.

I tried doing this with planes, and with simply rotating vectors, but this is the closest I’ve come to a solution. I am open to other ideas on how to do this.

Any help would be appreciated.
Grasshopper 1.0.0008
Rhino 8SR12

Help.gh (11.7 KB)

2

The construction of planes from vectors is usually a bit unpredictable. It is better to look for a reliable axis around which you can rotate. HTH Ferry

RE_Help.gh (18.7 KB)

grafik
grafik967×257 31 KB