here is a quick fern i did. (these shots were rendered in blender and print screened)

The main use when using opacity is to cut down on polygons. If i was to have made this completely of polygons , including each individual leaf indent, the numbers would be too high for use in a real-time application. instead i made this fern like so:


Notice it only has 160 faces in total. The texture uses an alpha map to tell which part of it is transparent.
The Alpha map consists of black and white.
black is transparent.
white is opaque.

simple really.
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