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uhhhh
I just wanted to say that what linus wrote in his tutorial about x and y was correct. But you misunderstood what he was trying to say you MUST check rectangular coordinates in your movements and dyn. movements, when you want to use a movement as x=x+0.1 or y=y+0.1, try it with out the option checked nothing happens since only d and r can be modified then. the example Napoleon gave, d=d*0.9 + x, worked without rect. coor. because you weren't modifying x or y, but d. that was all I would like to say about this.
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