Question: Three 3D plot issues: Shading artefacts, lost labels and colors turned to grey

In the attachment are three plotting issues that might be (partially) related.

 
Jagged shading     

 

 

Loss of color and incomplete clipping

The last one is the most severe because it takes color away when a plotobject is inside another object.

 

How can this be fixed? Explanations always welcome.

Shading_artefacs_and_lost_labels_and_color.mw

Please Wait...