The rendered output is combined with the background using the normal painting operation (i.e. the Porter and Duff over operator). This mode is used to simulate geometry such as guaze cloth or animal fur.
The rendered output is either fully opaque or fully transparent depending on the alpha value and the specified alpha cutoff value. This mode is used to simulate geometry such as tree leaves or wire fences.
The rendered output is fully opaque and any alpha value is ignored.
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