You said that two days ago in your first post. Why build a model that’s responsive to an attractor point that doesn’t correlate to sun position?
I suppose you could locate a point somewhere such that it “casts a shadow” on the facade surface to effectively become the attractor poiint? But where? And do you want to allow the sun to shine through or create shade with your facade?
I don’t think your facade is designed to follow the sun in either case. Please see this thread:
