Three.jsがレンダリングに使っているCanvasをdrawImageのsrcにしたり、toDataURLでbase64化したりすると真っ黒になるときの対策方法（preserveDrawingBufferをtrueにする） 🖼 - みかづきブログ・カスタム
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drawImage(image, sx, sy, sw, sh, dx, dy, dw, dh)－Canvasリファレンス
