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I have to model a rotary knob, which goes from roughly 7oclock to 4oclock in steps. Basically its a circle with half of a line. Would it make sense to rotate the whole circle or just the line or make a knob object. And also how can I make it go around in steps because I need to print out from the serial port so it communicates with the ardiuno. I want to make it go around when mouse is pressed and moved up = increment up and when its draged down = increment down, however in some other softwares i've seen you're able to move the mouse along the circle to increment it up or down. Any help is greatly appreciated. I just want some ideas on it.