A coverage-band cross-fade plan: the two adjacent levels bracketing the LOD
boundary the metric is currently crossing, and the FINER level's weight.
lo = coarser child index, hi = finer child index (== lo + 1),
hiWeight ∈ [0, 1] = the finer level's opacity (the coarser gets
1 − hiWeight). hiWeight = 0.5 exactly at the boundary.
A coverage-band cross-fade plan: the two adjacent levels bracketing the LOD boundary the metric is currently crossing, and the FINER level's weight.
lo= coarser child index,hi= finer child index (==lo + 1),hiWeight∈ [0, 1] = the finer level's opacity (the coarser gets1 − hiWeight).hiWeight= 0.5 exactly at the boundary.