I need to plug a value output to the position of the black slider in the ColorRamp b-spline. Is there a way to do that with drivers or do I have to create the b-spline from scratch, and if so, how? [Screenshot 2022-12-12 at 14.17.27]

What you tried to do in that nodegroup is for one segment… A colorRamp is made of 1 or more segments, and the Fac value is mapped to be in the range [0, 1] for every segment. The video I posted talks about this in chapter 2 (starting at 9:37).

B-spline

Support Materials and Textures

Reg_Nullify December 12, 2022, 4:11pm 2

This may be of help.