is there a quick way to create a vector4 plane in COPs?
channel-copy only does float or vector3…

Hi

You can simply add any plane via VOP COP.
Just use Bind Export VOP inside it and set it's type to vector4.

A generator COP also allows you to build custom planes in the Image tab. The syntax for the plane is:
That'll generate a vector4 plane named quat in 32b floating point format, with 4 components named x,y,z, and w.

Not sure how to do this (in my case: reading the plane) from the other inputs.

The bind VOP works, but for the other input, importpoint VOP doesn't work. How do I get the @ptnum/current pixel/iteration?

Edit: "opinput1_C2" in the bind VOP also doesn't work. (just read this does work in SOP's VOPs)