const PANES: [(Vec4, f32, f32); 3];Expand description
The tint of one pane, where it sits, and how far along the view direction.
The panes are offset sideways as well as in depth, so they overlap in bands: one region shows each pane alone, another two of them, and the middle all three. That is what makes the snapshot discriminate — a wrong sort or a wrong blend state changes the tint of the overlap bands, not just the overall brightness.
The order of this table is the order the panes are drawn in after the sort — farthest first — so drawing them as declared, or reversed, would disagree with it.