Yep, that’s exactly what I mean.
The obvious approach would be to choose the LOD where the texel size most closely matches the current “cone size” (if we pretend for a second that the rays are closely packed cones). But that wouldn’t work well, because features will need to be thickened in the coarser LOD’s (otherwise thin walls will disappear), and therefore small gaps like windows would close up. could be solved by subtracting a constant from the LOD level and clamping to 0. way the “closing up” would still happen, but it would only happen at distances far enough away from the starting point that it won’t matter