Here is a screen capture of the issue I’m having. https://gyazo.com/464f2e79e6b845d6f4a9689dc5b6781b
As you can see, the shadow being cast by the smaller sphere is perfectly normal, until it starts to approach the edge/more vertical slanting side of the larger sphere, and it becomes all jagged and rough. Why is this? Is there a solution, or is this just one of the downsides of realtime rendering?