pub const REFERENCE_PX: u32 = 230_400;Expand description
The render target the attractor’s sample density is anchored to: 640x360, 230 400 pixels.
The attractor’s trail grid is surface-sized, so its deposit spreads over
whatever the target holds and a flat count therefore falls in density as the
target grows — 0.651 particles per pixel per frame here, 0.072 at 1080p, which
is the whole of the “it just looks like Leviathan upscaled” verdict. This is
the size whose density is already accepted, so it is where
attractor_budget resolves to exactly the tier’s own anchor.
The denominator is target pixels, not grid texels, and the two differ by the grid’s 256-px quantization — 1.71x here, 1.07x at 720p, 1.26x at 1080p, 1.00x at 4K. Bounded, and named because the deposit lands per texel.