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Create dynamic surface elevation


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1. Updatable is a hint for the graphics card. You should use it when you know that the mesh will be updated multiple times: this way the data will be in a memory that both CPU and GPU can reach. It is less efficient than setting updatable = false because in this case the data will be in fast GPU memory. When updatable = false, calling setVerticesData will recreate the content (which is ok if you do it just a few times)

2. This is because your faces do not share vertices: You can replace the TiledGround by a regular ground: http://playground.babylonjs.com/#1XBLWB#231

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