Vive Controllers Rigidbody::MovePosition

Hi all,

I'm creating a cricket type game using the HTC Vive and I'm having issues with the ball sometimes going through the bat.

I've searched for quite a while and have discovered that it seems to be because the Vive controller's position is set using the transform, rather than using the Rigidbody::MovePosition functionality resulting in a 'teleporting' effect and the correct collision not occurring. Note: I have the cricket bat as a child of the controller.

I found this post on the steam forums where one of the Fantastic Contraption developers replied recommending the modification of the SteamVR_TrackedObject script to use rigidbody movement instead of transform movement. However, I'm still very new to both Unity and VR...

I've tried dozens of ways but I can't quite seem to get it working..

Could anyone shed some light on how I could implement this so that my collision react appropriately?

Thank you!

 

Have you tried not parenting it and calling MovePosition in LateUpdate on a script attached to the bat?

 

RigidBody has 3 modes of collision detection as well. Discrete, continuous and continuous dynamic. If it's discrete and something moves by quickly then it won't see or calculate the inbetween positions.

 

I experimented with some scripts but the main issue I had was I couldn't get the rotation correct. I tried using the controllers rotation with a specified offset but to no avail.. I will give this another shot today. If you have any tips in the meantime, please feel free to share!

Thank you; both the ball and the bat are on continuous dynamic, however I'm pretty sure it's due to the controller transform being modified directly rather than using the physics engine.

EDIT: I /think/ it's working now. Here's a snippet of the code I used.

Code (CSharp):

1. void FixedUpdate()
2.     {
3.         if ((int)tObj.index != -1)
4.         {
5.             device = SteamVR_Controller.Input((int)tObj.index);
6.  
7.             // Make rigidbody follow controller.
8.             rb.MovePosition(controller.transform.position);
9.  
10.             // Adjust rotation.
11.             Quaternion newRotation = controller.transform.rotation * Quaternion.Euler(-90f, 0f, 0f);
12.             transform.rotation = newRotation;
13.         } else {
14.             Debug.Log("Controller index not found.");
15.         }
16.     }

I was trying this before but couldn't work out how to modify the rotation correctly (and still don't fully understand, but that's a lesson for another day). One thing I still don't understand why it's happening is the controller index not being found and consequently being set to -1 (None in the enum).

Thank you for all your help