[Controller] Provide haptic feedback on interactions

[thestonefox]

Make the controller rumble when a user touches, grabs or uses something.

Perhaps you could have a global rumble amount that is overriden by the touching object?

[thestonefox]

I think the controller events could have a public method to call the rumble code. Then you can call it yourself whenever you want.

And the interactable object can have a rumble amount for touch, grab, use. Perhaps have a global rumble amount on interact classes too

[thestonefox]

I'm not sure why the SteamVR_Controller TriggerHapticPulse method only works when it's continuously called. It seems the ushort duration parameter is actually the strength of the vibration and has nothing to do with the amount of time the vibration lasts for.

This is why when it's called within a button press code nothing appears to happen because the vibration happens for a split second.

This commit: 2dbcff7

Adds a working version of the haptic feedback on the controllers and includes a duration and strength parameter.

[rmoussawi]

Copying my request from my youtube conversation with you :)

Can you please include the following to your upcoming video?

"Do an example scene where a collision whilst holding an object causes the rumble"

Thanks a lot!

[thestonefox]

Completed with e8e3bfe