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並前往https://stackoverflow.com/questions/11544608/how-to-clear-a-rectangle-area-in-webgl

How to clear a rectangle area in WebGL? - Stack Overflow

Yes, set the clear color to 0,0,0,0 (eg gl.clearColor(0,0,0,0) ) which is the default. That will see through the canvas whatever is behind it or ...

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