Projected bounding-sphere area in drawing-buffer pixels (0 off-screen).
Visible (committed) element count.
True when the node's blend mode sums energy (additive / luminous / volumetric) — the shader ladder can thin it, so its cap is the same few elements per pixel the ladder targets. False for max / normal / opaque, which have no linear brightness knob and get the tighter cap.
One node's projected footprint, as the density tracker last measured it.