Fix situation where the camera can get stuck near the surface when zooming.
Fix situation where the camera can get stuck near the surface when zooming.

geoscan/cesium,kiselev-dv/cesium,likangning93/cesium,omh1280/cesium,denverpierce/cesium,CesiumGS/cesium,josh-bernstein/cesium,esraerik/cesium,esraerik/cesium,YonatanKra/cesium,YonatanKra/cesium,kiselev-dv/cesium,NaderCHASER/cesium,likangning93/cesium,AnimatedRNG/cesium,denverpierce/cesium,esraerik/cesium,progsung/cesium,emackey/cesium,progsung/cesium,jasonbeverage/cesium,hodbauer/cesium,soceur/cesium,AnimatedRNG/cesium,aelatgt/cesium,likangning93/cesium,soceur/cesium,wallw-bits/cesium,hodbauer/cesium,jason-crow/cesium,soceur/cesium,NaderCHASER/cesium,oterral/cesium,ggetz/cesium,aelatgt/cesium,kaktus40/cesium,CesiumGS/cesium,likangning93/cesium,likangning93/cesium,omh1280/cesium,jasonbeverage/cesium,emackey/cesium,ggetz/cesium,denverpierce/cesium,hodbauer/cesium,denverpierce/cesium,YonatanKra/cesium,josh-bernstein/cesium,AnalyticalGraphicsInc/cesium,geoscan/cesium,jason-crow/cesium,jason-crow/cesium,wallw-bits/cesium,aelatgt/cesium,ggetz/cesium,esraerik/cesium,AnimatedRNG/cesium,kiselev-dv/cesium,ggetz/cesium,CesiumGS/cesium,AnimatedRNG/cesium,YonatanKra/cesium,omh1280/cesium,oterral/cesium,CesiumGS/cesium,oterral/cesium,NaderCHASER/cesium,emackey/cesium,aelatgt/cesium,kaktus40/cesium,omh1280/cesium,kiselev-dv/cesium,jason-crow/cesium,AnalyticalGraphicsInc/cesium,emackey/cesium,wallw-bits/cesium,wallw-bits/cesium,CesiumGS/cesium