Shading in cesium/Improving shading

First of all is there a way to get a response to questions from the Cesium Community faster? This is my third question: two without a response but I got the solutions myself.

I have implemented Cesium JS in my dashboard app, but the 3D objects appear really dark. Is there a way to improve the shading?

This is a sample of the 3D models and how it looks: