Best practice for a sliding door as Kinematic body ?

[Froyok]

I wanted to create a simple sliding door (the kind you see at the entrance of your local supermarket).
To me it seemed like the best approach for this would be to make a kinematic body and drive its movement via code to have control over its animation speed (with speedup and slow down, or something complex).

I looked at the following discussion which explained that to properly move the body I needed to use MoveKinematic() instead of SetPosition()/SetRotation(). That works, but what surprised me is that once the system update is done, the body velocity does not go back to 0 even when MoveKinematic() isn't called anymore. I have to manually set it to 0 to ensure the body stops moving.

This is roughly how I move the object in my code:

-- Called once per frame while the door is moving
function Door.Update( Deltatime )
	if Animation.Time < Animation.TimeMax then
		Animation.Time = Animation.Time + Deltatime

		-- Animation progress from 0 to 1
		TimeElapsed = Animation.Time / Animation.TimeMax
		TimeElapsed = math.clamp( TimeElapsed, 0.0, 1.0 )

		-- Inverse animation to close door if already open
		if IsOpen then
			TimeElapsed = 1.0 - TimeElapsed
		end

		TempVec1 = Position + DirectionAxis * Distance
		TempVec1 = Lerp( Position, TempVec1, TimeElapsed )

		BodyMoveKinematic(
			Body,
			TempVec1,
			Rotation,
			math.max( ENGINE_DELTATIME, 0.001 )
		)
	end
end

So basically I use MoveKinematic() the way I would use SetPosition().
I was wondering if that was the expected way of managing this kind of objects ?
If so, is killing the velocity the expected outcome afterward ?

[jrouwe]

MoveKinematic will calculate the velocity needed to go from where you are to the desired position in the desired delta time (= usually a single physics update). The physics engine will never change the velocity of a kinematic body, you need to do this yourself. If you stop calling MoveKinematic the body will continue moving at the same speed forever. If you want the body to stop after arriving then call BodyInterface::SetLinearAndAngularVelocity(body_id, Vec3::sZero(), Vec3::sZero()).

[Froyok]

Sounds good, thank you for your answer ! :)