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simple-terrain-viz's Issues

最低级的父级瓦片覆盖当前级别瓦片,绘制模糊

maptalks的示例中,因为会同时加载3个级别的瓦片,最低级别瓦片因为覆盖的范围较大,会覆盖掉当前瓦片,出现模糊现象:

image

解决方案是通过给不同级别瓦片,设置不同的stencil值,通过模板测试,来解决父级瓦片覆盖问题。
强制父级瓦片绘制时,子级别瓦片绘制的区域无法通过模板测试,就不会绘制了。

实现步骤:

  • 把每个tile的zoom设置为mesh的stencil值
  • stencil的func设为 <=

代码如下:

stencil: {
    enable: true,
    func: {
      cmp: '<=',
      ref: (context, props) => { return props.zoom; }
    }
  },

参考资料

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