René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Dark ringing in redering with layer of plastic spheres","articleBody":"Hi,\r\nI've been rendering some simulations data that I have using this code and things look really great in general! I've run into a problem recently where dark rings can be seen when rendering a long layer of plastic spheres. (Hopefully the attached pic goes through). I've tried a few things with the camera angle and the aperture radius but nothing seems to help much. I was wondering if you had any ideas? I can also post the data and a minimal example. \r\n\r\nThank you for any help you can provide!\r\n \r\n![sed_lub_0](https://user-images.githubusercontent.com/18449482/62578566-72e4f900-b86f-11e9-93b4-03e75a5b3c78.png)\r\n ","author":{"url":"https://github.com/brennansprinkle","@type":"Person","name":"brennansprinkle"},"datePublished":"2019-08-06T21:30:32.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/4/plotoptix/issues/4"}