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example中canvas尺寸设置错误 #53

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@lessball

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@lessball

renderer.setPixelRatio(wx.getSystemInfoSync().pixelRatio);

经实验,在pixelRatio大于1时,renderer.setPixelRatio会改变canvas尺寸,之后再调用renderer.setSize(canvas.width, canvas.height)会导致canvas尺寸再次变大。具体表现之一为视角旋转变慢。
交换两行,先setSize后setPixelRatio可以解决

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