This function is probably useless for 99.9999% of our users.
You will need it only if you choose to write your own version STATE_engine_render()
The 2d polygon animation is updated automatically according to need each time that STATE_engine_render()
is called and a polygon with animation is rendered. If one doesn't call STATE_engine_render()
(because one chooses to use his own renderer) then the 3D_animation frame is not updated.
Only in this case you should call this function so that your external renderer can benefit from
the 2d animation mechanism.
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