BuildStreamedSceneAssetBundle problem

hi guys:
I use BuildPipeline.BuildStreamedSceneAssetBundle to build scene, and use a loader to load scene bundle, in the scene I used Terrain and the unity’s palm. When I run in webplayer, i found that when when the distance is far, the palm can’t show, it looks like this pic
!alt text
, do you know why this happened?


What platform do you select for building? It should be also webplayer