<!-- Instructions: https://github.com/PolymerElements/seed-element/CONTRIBUTING.md#filing-issues --> ### Description 3d traces "overlap" eachother and only one can be visible at a time ### Expected outcome I can view multiple 3d traces ### Actual outcome I can only view 1 ### Live Demo https://gist.github.com/Chris7/e309d4c7c3f07082886d749652338860