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Three.js 使用canvas作为纹理,出现失真,如何处理?

最近使用Three.js做一个3d地球,需要在地球的某个坐标贴上一个扩散的圆形,如下图:
image

但是使用canvas作为纹理去实现贴图,出现了失真,如下图:
image.png

请问这个问题如何解决,求教


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canvas style的width和height弄大点,然后width和height属性等比缩小


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