https://github.com/mrdoob/three.js/blob/master/src/renderers/WebGLRenderer.js#L1903
翻 three 的代码发现，readPixels 之前需要检查 frameBuffer 是否完成了
有大佬知道具体原因么？
This topic created in 1948 days ago, the information mentioned may be changed or developed.
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no1xsyzy Jan 24, 2021
https://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext/readPixels#exceptions
A gl.INVALID_FRAMEBUFFER_OPERATION error is thrown if the currently bound framebuffer is not framebuffer complete. |
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