-
Betcha making car wheels rotate is pretty simple, huh?
Am working on a rather simple animation in AE 6.5 — we have a forklift moving across the screen.
I have the wheel rotating (actually just the layer with the lug nuts rotating, so the higlights on the wheel hub don’t rotate) but it doesn’t quite match the movement of the forklift — sometimes the wheels look like they are spinning to fast (burning rubber) or too slow (slipping)
Of course I have the forklift accelerating from a stop so it looks like it gradually gets up to speed. Manually trying to match wheel rotation with forklift movement is pretty crazy, although at least I have the lug nuts as a child of the forklift.
I am guessing there is probably some cool trig expression I could use that somehow calculates the arc length of the wheel or something and coralates that to #degrees rotation so that, depending on the position of the forklift on the screen, the wheel rotates to match.
Is this making sense? I have never worked with expressions, and its been a looooooooonngg time since 11th grade trig class but I am guessing I’m not the first guy to need to do this and there is probably some code I could cut and paste?
……….Thanks -
2 Replies
-
Is this example good?
https://www.jjgifford.com/expressions/basics/example_wheel.html -
WOW, what a great resourse. That was exactly what I needed — after playins some and tweaking some here and there, I can’t tell you how great that works. Many, many thanks. As great as AE is, it’s you guys who really make it such a useful and valuable program!
Reply to this Discussion! Login or Sign Up