OptionalnameStable name for engine lookup / toggling. Default the class name.
OptionaldepthDepth-test against the scene so lines are occluded by geometry (with a faint "x-ray" pass for the hidden parts). When false, all lines draw on top. Default true.
OptionalxrayBrightness of the occluded (x-ray) pass, 0 disables it. Default 0.25.
Returns the line-list vertices to draw this frame, or null for none. Read lazily each frame so the producer can rebuild on demand.