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WebGLでレンダリングしたものをキャプチャする

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WebGLでレンダリングしているcanvas要素から、toDataURL()メソッドでキャプチャが取れなかったのでメモ。

オプションのpreserveDrawingBuffeをtrueにする。

var context = canvas.getContext("experimental-webgl", {preserveDrawingBuffer: true});

ただ、これを使ってもcanvas 2DにdrawImageしてもキャプチャが表示されなかった。
new Image()で生成したimgのsrcに設定すると表示はされた)

##参考

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