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Element 3D Car Tire Rotation
I found the following expression by Dan Ebberts. He was helping someone else trying to automate tire rotation on an Element 3D car model. I applied the expression to a null set up for tire rotation, but nothing happens. No error, but no rotation. Any ideas?
dist = 0;
f = timeToFrames(time);
f0 = timeToFrames(inPoint);
for (i = f; i > f0; i--){
p1 = position.valueAtTime(framesToTime(i));
p0 = position.valueAtTime(framesToTime(i-1));
dist += length(p0,p1);
}360*(dist/(Math.PI*width))
Jason Jenkins
Flowmotion Media
Video production… with style!Check out my Mormon.org profile.
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3 Replies
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Does the null have a parent? If so, you’d have to modify it to do something like this (sorry, I don’t have time to test it):
p1 = toWorld(anchorPoint,framesToTime(i));
p0 = toWorld(anchorPoint,framesToTime(i-1));Dan
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[Dan Ebberts] “p1 = toWorld(anchorPoint,framesToTime(i));
p0 = toWorld(anchorPoint,framesToTime(i-1));”Great! The wheels are spinning now. Unfortunately, when I animate the car in reverse, the wheels still spin forward…
Jason Jenkins
Flowmotion Media
Video production… with style!Check out my Mormon.org profile.
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[Jason Jenkins] “when I animate the car in reverse, the wheels still spin forward.”
Could this have something to do with the parent null axes not matching the orientation the world axes?
Jason Jenkins
Flowmotion Media
Video production… with style!Check out my Mormon.org profile.
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