moving/rotating platform and physics ball

Unity Engine
1

I have a animated rotating model that looks like this:

The ball is suposed to move over it but its giving me trouble, the “wings” are not influencing the ball as they are suposed to do.
For example, if the ball is not moving, the wings just move under the ball and the ball stays in place and then falls off.

I tried attaching a rigidbody to the wings with no result and also tried the script below, but its result is jittery/laggy.

Any idea’s how to make this work?

function OnCollisionEnter(collisionObject : Collision)
{
	collisionObject.transform.parent = transform;
}


function OnCollisionExit(collisionObject : Collision)
{
	collisionObject.transform.parent = null;
}
2

I haven’t done anything like this myself so I can’t say for sure what will or will not work, but: have you tried using physics materials with higher values for friction?

3

yes I had a similar issue… the rotating platform doesn’t influence the ball.

What I did was…
if detecting that the ball is collidiing with the rotating platform…
get the vector distance fom the platform center to the ball, you can calculate the tangent vector under the ball. (90 degrees y rotate offset from the vector from the ball to the center)
This is the force direction on the ball.
Force applied is F x distanceFromCenter x rotationSpeed

You’ll have to experiment with F to get a good value, that approximates the friction you want.

Then using this vector… apply a force to the bottom of the ball at the collision point (or slightly above the collision point)

This rotates and slowly drags the ball in the correct direction of the rotating platform…

Its not perfect, but looks fairly convincing.

4

Finaly got into this again and got a satisfactory result.

Physicsmaterial does not seem to have any influence, I tried using rubber what has the most friction.

I ended up removing the animation and use a FixedUpdate function instead to slowly rotate the object.
When I parent the ball this way to the object, there is no jittering I can notice.