When I was playing with shadows I encountered a strange issue with ShadowOnlyMaterial, please refer to this playground: https://playground.babylonjs.com/#ZT8BKT#89
There is an abrupt change in shadow effects between camera beta Math.PI/15 and Math.PI/14. This does not happen if the ground uses StandardMaterial (line 22).
Interestingly, if I change the ball visibility to 1, this artifact disappears, however I need to see the tube inside the ball so that does not work.
Would highly appreciate any insight on this. Thanks!