Added tweak to getSpecular shader. The result of pow is undefined if specular and shininess are both 0. We were encountering models with a shininess of 0 which would cause the models to turn black depending on the angle.
Added tweak to getSpecular shader. The result of pow is undefined if specular and shininess are both 0. We were encountering models with a shininess of 0 which would cause the models to turn black depending on the angle.

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