MAX_
Domain bound for terrain self-shadow: cascades with texels coarser than this (meters) exclude terrain from the depth pass. Relief shadow below map resolution collapses to a few quantized visibility levels (iso-depth banding at globe scale); declining to render below-resolution content is the explicit form of what the moment-based pipeline did by blurring it into invisibility. Shape casters remain meaningful at any texel size and are never gated - terrain still receives their shadows everywhere.