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Depth-sorting of multiple overlapping particle systems

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Hi, my particle system runs in a vertex shader (DX9). The drawing order matters and Z-buffer or premultiplied alpha is not an option. To perform depth-sorting within one vertex buffer, the CPU could sort by depth and update the index buffer. Now what if there are multiple overlapping particle systems?? I could combine them into one system. That's difficult because the particle systems do not spawn at the same time. I'd need to resize and update vertex buffers a lot. Are there any other options to depth-sort particles from multiple vertex buffers?

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