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What is the triangles threshold from which using billboards will be worthwhile?

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Hi, Billboard is only 2 triangles, but it has alpha channel. I have HUGE amount of light models (between 30 to 200 triangles). In order to accelerate the frame rate, I replace some of them with billboards (textures). The frame rate is very very critical in my walkthrough because I render huge number of small models. Is there any EXACT triangle threshold measure for determining what is faster to render, the model or the billboard?

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