brennansprinkle

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`optix = TkOptiX() ... optix.set_float("scene_epsilon", 0.01)` This worked perfect! Thank you! I wound up using 0.05 but the scene has no rings now. ![sed_lub_3000](https://user-images.githubusercontent.com/18449482/62638712-01a75380-b90c-11e9-97d8-ddd1b2bb70ff.png)

Sorry that took a bit longer, I wanted to wait for a permanent citation for the documentation. I've committed some updated docs.