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The setting small feature culling pixel size is a float. But wouldn’t it make more sense for it to be an integer? If someone set it to 2.5, would it really make sense to cull half a pixel? I had thought that pixels were indivisible.
This feature doesn't cull the pixels themselves. What it does is compare the size of an object before its rendered to the size of a pixel. You could sensibly configure it to exclude any object that's smaller than 2.5 pixels, for example. Once objects are rendered, their bounds are of course quantized to actual pixels; although if multisampling is used you could still technically have a pixel that is 'half' occupied by an object.
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