request stop at specific level

[firstrilfe]

I got a tif that result in maxium level of 13 by ctb-tile command with default options. When specific the start and end zoom level I got the correct result like level 14 terrain files, level 15 terrain files ,etc.However, no higher levels are requested than 13 when I zoom into an area. I looked up into level 13 terrain files turns out the byte that indicate existence of children is 0, so Cesium won't request higher level than 13. Is there any way to tell ctb-tile command to generate the right value?

[firstrilfe]

Enlightened by Blocky terrain #4 it seems that i may oversampling the data. The level above the native tif data had generate the terracing artifacts.