Hi, I would like you to add an opacity feature somewhere, hopefully in the color selector tab. I know that it won't be opaque when it is 3d printed, but if allowed, it should allow designers to "see" through the opaque part of their design. It would mostly be a utility feature, just a checkbox that says opaque(default is "on"), and if deselected it will make the selected part of the design mostly invisible(like a ghost, or a colored hole). It would be really helpful in many places(representing glass, seeing the position of other shapes inside hollow objects, etc.).