Hello community. I have 3D tileset as photogrammetry model placed on Cesium Terrain, see sandcastle here. Unfortunately tileset has areas which are below terrain and thus they are not visible.
Question 1: Is there any setting to dissable terrain in those areas or prefer tileset over terrain or something to actually see tileset data?
Question 2: If I would like to use only WGS84 ellipsoid as terrain (flat), I would have to set height of the tileset lower because it floats in air. I know there is sandcastle demo which shows code for function to set its height but I want to set it as fixed in code without button,
Question 3: I would like to increase cachebytes and maximumCacheOverflowBytes but dont know how to implement it in my code as documentation is not clear for me 
and coulnd find any example codes that implement them.
Appreciate any help in advance 
Update: I found answer to Question 1. I can use use points with clipping planes to cut terrain.
The remaining questions still need answer.