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Probleme with car wheels animation

L

lumat

Messages
342
Hello
I've animated a vehicle along a loop path with animated wheels. It works, but the wheels are in the wrong direction during a part of the loop.

To do that, I made the following
1 cube and a wheel (axe Y) along a path (axe X). This path is a loop

1- apply to the wheel a constraint "Transformation"
Target : cube - Extrapolate "on"
Source : location X and source to dest mapping X=Y
Destination : Rot Y Max 180°
2- The wheel is a chilfren of the cube
3- Apply to tyhe cube a constraint "Follow path" (Follow Curve "On") forward X

With this solution, The wheel rotate in the good direction on the first part on the loop, where the cube go along the X axis. But
after the turn, the wheel continue his rotation in the same direction and not in the direction of the cube (-X this time).
Visually it turn in the inverse direction of the cube !!!


Finally only one question for me : How make the wheels rotating in the direction of the cube whatever the direction of this one... Someone as an idea ?

I thank you for advance for yuour help :)
Luc
 
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Hello, I found a new way. This time I used drivers.

- I create a guide. A simple plane. I apply to it a modifier "Curve" on X, my path.
- I create an empty for the wheel, the cube, and the guide, with parent link ( Empty_Cube to Empty_Guide, Empty_Wheel to cube ...).
Now when I move my guide along X, the objects move along the path.
- I create a driver for the wheel, "Average" Value, object "Guide" and X location.
- This time, my wheel rotate all along the path, in the right direction (the direction of the cube), when I move the guide along the X-Axis.

My problem of rotation direction is solved. But, When I export in FSX, my objects go straight, they do not follow my path !!!!

I solved a problem but I created another !

Help ! :p
 
Hi Luc,

Sorry this constraint does not work in our FSX / P3D simulators
To my knowledge ...
 
I do not know at all I have already tried, without success
I will try again...

good luck
 
I found a solution, I think :

Always my cube and my Wheel.
1- I create a bezier circle
2- My weel is a children of the cube
3- I create an empty
4- The Wheel as a "transformation" constraint with the empty as target
5- The cube as a follow path constraint and a driver (on the offset) with the empty as object
6- I create a generator for the empty to make it animated in the timeline (Empty action)

Like this, it work on FSX.
 
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