Why does decreasing the error target cause tiles to load for so much longer to the same spot?

[gkjohnson]

Change the error target to 6 and open the google tiles aerial view.

[gkjohnson]

Likely because at least the whole environment afar is still loading and when the error target is lower then it takes longer for the far off tiles to reach a loaded state.

• The "priorityCallback" function could be possibly updated to be sorted differently based on closer tiles, etc.
• Perhaps the apparent calculation for screenspace error can increase quadratically based on distance?

[gkjohnson]

Looks like Cesium uses a single "priority" value rather than a waterfall-style fallback compare:

https://github.com/CesiumGS/cesium/blob/22658a56b57b671c815647bf00ed08be8565901f/packages/engine/Source/Scene/Cesium3DTile.js#L2239-L2247