maptalks's version and what browser you use?
----v1.0.0-rc.30 gl-layers v0.31.9

Issue description
----在微信端或是手机浏览器打开加载地形的案例，地形无法正常显示（无法正常拉伸出高度），请问大神是不是不支持手机端的地形渲染？

Please provide a reproduction URL (on any jsfiddle like site)
----http://examples.maptalks.com/examples/cn/3d/terrain/load