I made a more GDK linked version
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I can’t understand how I made the newbie’s mistake to update AFTER vsync and not DURING vsync!
Now working on behavior : each step, anim sprite will call its own update function.
Very handy because you don’t have to handle every anim x/y/properties update on one function.
Of course, not great for EVERY game since you haven’t fine control (like update some sprites every 3 frames, etc…) but I’m pretty sure it would be great for fighting game or end level STG boss!