[GitHub] [incubator-echarts] ljxtest opened issue #9142: 3d地球设置top值效果不对，地球显示不完整

[GitHub]

<!--
为了方便我们能够复现和修复 bug，请遵从下面的规范描述您的问题。
-->

### Version & Environment [版本及环境]
最新版本echarts
最新版本chrome
win10和苹果





### Expected behaviour [期望结果]
预期结果显示半个地球
![image](https://user-images.githubusercontent.com/25787395/46195244-5b2b1300-c336-11e8-89e1-3d6dd48238ce.png)




### ECharts option [ECharts配置项]
option = {
    backgroundColor: '#000',
    globe: {
        baseTexture: "data-gl/asset/world.topo.bathy.200401.jpg",
        top:'40%',
        postEffect: {
            enable: true
        },
        viewControl: {
            autoRotate: false,
            distance:80
        },
        light: {
            main: {
                intensity: 2,
                shadow: true
            },
            ambientCubemap: {
                texture: 'data-gl/asset/pisa.hdr',
                exposure: 2,
                diffuseIntensity: 2,
                specularIntensity: 2
            }
        }
    }
};
问题1:当设置postEffect的enable为true时地球上半部分显示不完整。
问题2:当设置postEffect的enable为false时，win10下面用chrome浏览器查看地球上班部分也显示不完效果一样，苹果电脑上看效果正确。
![image](https://user-images.githubusercontent.com/25787395/46195675-87935f00-c337-11e8-93c0-aa109f370625.png)



[ Full content available at: 
https://github.com/apache/incubator-echarts/issues/9142 ]
This message was relayed via gitbox.apache.org for devnull@infra.apache.org