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How to use different opacity levels and alpha blending?

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Hi dudes! I'm doing a 2D engine where my polygons are just quads with a texture. If I add an alpha channel and I activate blend glEnable (GL_BLEND); glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); everything works as I expect, but now I would like to add a general opacity property in my meshes that I could change "on the fly". What should I do? Any suggestion? Thanks a lot for your time.

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