road cars motion to follow leader (object null) and maintain a fixed distance

I am trying to create a model of my local intersection where a car will facilitate a stop at a red light and the string of cars behind will follow and stop a remote fixed behind the car to the front desk

I'm so close and yet so far to the solution to this, I'm still pretty new to expressions if I need a little help. I previously made a highway with a 1 000 cars using a tutorial dedicated to the CG snake Jerzy Drozda Jr to maltaannon.com, but from the next project that I realized that this method did not allow the cars maintain a fixed distance.


I then read Dan Ebberts "creation of trails" section of www.motionscript.com and found that of Jerzy Drozda method, so that the ideal for small projects, is problematic with a large amount of objects because it uses a phrase "cascade", where in one layer refers to the previous layer, which refers to the previous layer, etc. This can significantly increase the amount of work After Effects needs to do to each image. I got first hand with this when I did my freeway. After effects was almost impossible to use because there was a lag of 10 seconds after each click.


Which brings me to my current problem, get this expression to work I have attached the file that I work as a download link for my reader of Google here


Here's the original motionscript.com formula - if you want to see just research guide "//start model query time" in Google and click on the first link.


I tried so many things with this expression, but the dam car simply refuses to follow the null object!


in the Position property:

STRT = 0; time of beginning of model movement

end = 4.0; end time of query model

t = thisComp.layer ("template");

offset = (t.effect ("offset")("Slider")/100) * (index - 1);

travel = linear (t.effect ("travel")("Slider")/100, strt, end);

t.position.valueAtTime(travel-offset)

in the Orientation property:


STRT = 0; time of beginning of model movement

end = 4.0; end time of query model

t = thisComp.layer ("template");

offset = (t.effect ("offset")("Slider")/100) * (index - 1);

travel = linear (t.effect ("travel")("Slider")/100, strt, end);

If (trip < = offset) {}

VECT = t.position.velocityAtTime (0);

} else {}

VECT = t.position.velocityAtTime (travel - offset);

}

lookAt (position, position + vect)

Hmmm, are you sure this is in the right forum? It is a forum of Captivate, you use Captivate to create this animation?

Tags: Adobe Captivate

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