问题
In opengl, is it bad practice or not recommended to modify the vertex array after I have drawn it?
回答1:
It's not bad practice if you modify the vertex array when you draw it as ordinary vertex array.
It's bad practice to modify the vertex array if you use vertex buffer objects in your draw method. That's because you have to reupload it to your VRAM once it is edited.
来源：https://stackoverflow.com/questions/4703550/android-opengl-modify-vertex-array-after-draw-call