[Solved] Is it okay if we change transform.position on a kinematic rigid body which also does not use Gravity?

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Hello Devs,

I am in a position to use a rigidbody collider on a GObject. The rigidbody is just for namesake hence it won't be using any Gravity and it will be kinematic. Here on this GObject I am using two functions constantly such as

 this.transform.rotation = Quaternion.Lerp(this.transform.rotation, Angle, Time.deltaTime/2);

and one like this -

 this.transform.position = new Vector3(idealPos.x,(Target.transform.position.y + 40),idealPos.y);

Is it okay to use in on a rigidbody. I would like to stress again that the purpose of a rigidbody is just for the collider which is used for triggering events.

Thank you,

regards,

Karsnen.

Answer 1

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Answer by Montraydavis · Nov 23, 2012 at 08:59 PM

The only physics involved in transform.position is setting the position, so yes, this is perfectly fine.

Pretty much anything in the game can have it's position set to (x,y,z)--regardless of rigidbodies, colliders, etc.

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Karsnen_2 · Nov 23, 2012 at 09:55 PM 0

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Answer 2

Answer by Owen-Reynolds · Nov 23, 2012 at 09:44 PM

The big warning about rigid bodies and "external" motion (changing `transform.position` yourself) is that it will often break physics. Setting velocity or using AddForce lets physics perform the movement. It can then see two things are going to collide, and bounce them properly.

Just changing position causes the physics to suddenly see overlapping objects. It might blast them apart, or let them overlap, or give a tiny push that looks almost like a proper bounce (so slowly changing position sort-of works on an RB.)

IMHO, `isKinematic` is designed for exactly what you're using it for -- making a no-physics-motion/effects object technically count as one, for purposes of joints or causing collisions.

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Karsnen_2 · Nov 23, 2012 at 09:55 PM 0

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[Solved] Is it okay if we change transform.position on a kinematic rigid body which also does not use Gravity?

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