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Chunked LOD - Big VertexBuffer, Height Textures or Small buffers? and collision too

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I have a question about Chunked LoD I was wondering what's people's opinions.

1. One big vertex buffer with many index buffers (one for every chunk)

2. One small vertex buffer and index buffer and a texture to transform the height

3. Vertex Buffer for each and every chunk, can use one index buffer though.

What's your opinion on the methods? Which one would be your method?

Also, how do you integrate height tracking and collision with the terrain wisely? I was thinking that "Well, we need to have all the height data anyways" and this is why I thought maybe one big buffer with a lot of indices might be the best. After all I shouldn't be tracking the height of the lower detailed chunks.

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