just in case someone has a similar problem: I wanted to visualize a 4D Listdata. The first 3 coordinates describe a surface and the fourth dimension a scalar value.
A classical example are Finite Element results for shells, where stress is plotted on a surface; or alternatively a temperature-field on a 3D surface.
I found some very helpful solutions [1,2,3,4], but none of them really solved my problem, because I wanted to have a continuous function and not a point cloud, and it couldn't get the last solution working in my case. I thought the solution might be worth sharing: