General Category > ASL Scripts

Object must always look ahead

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Pirmin:
I have a vehicle the does some movements (I start with a circle).
My vehicle always should look ahead where it is moving to.
I will write the Location Controllers to do more movements (e.g. lines, curves, ...) depending on the current frame.
I could in parallel write Orientation Controllers to set the desired orientation at any location.
Isn't there a way to just write a single Orientation controller which always assures that the orientation stays ahead?

Kubajzz:
You can try creating only the position controller and set the orientation to "facing path".

Pirmin:
I have tried a lot.

* Relative to Parent -> Vehicle is allways looking to Z direction
* Relative to Path -> Vehicle is allways looking to X direction
* Relative to Other, Path -> Error: No such element
* Relative to Facing Other, Path -> Error: No such element ???

Kubajzz:
Oh, sorry, I wrote "facing path", I meant "Relative to Path"... Yes, you're right, I've just tried it and I found out that the "relative to path" function doesn't work when the path is created by a controller script...

I'm afraid you'll have to animate the orientation by hand... Or you can use key frames instead of a controller script for position - that would make "relative to path" work correctly...

Steve:
Hmm.  The problem with controller scripts for position is that they have no derivative - i.e. direction.  They only return the position at a specific frame.  I suppose I could evaluate the position at frame N-1 and N+1 and use those to create a derivative.  This would require me to change how controllers are evaluated in general.  Now Anim8or assumes that only one frame's data is needed at a time.

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