Enemy AI capsule collider tilts when moving

Questions & Answers
1

I have set the collider’s rotation along all axes to zero. I have constrained the collider’s position and rotation along its XYZ axes. I have added mass to its rigidbody. I have checked the the rotation of the game object during animation in Blender (it was upright).

Yet, whenever I hit play, the collider rotates back along the X axis, making the AI appear to be leaning back about 10 degrees. Regardless of the direction he is moving, he looks like he is going to fall backwards.

Any suggestions?

Update: I tried adding this to the Update function.

gameObject.transform.rotation.x = 0;

It had no effect.

2

OK, I finally figured out what the problem was.

I had set the enemy AI’s target position along the Z, X and Y axes. This caused the enemy AI to “tilt” up or down along its own Y axis in order to reach the target.

To fix the tilting, I just zeroed out the Y axis value of the target position. I found the following code on the answer to another question, elsewhere on the forum.

Hat tip, and many, many thanks, to Aldo Netto.

function Update () {
    var lookDir = target.position - myTransform.position;
    lookDir.y = 0; // zero the height difference
    myTransform.rotation = Quaternion.Slerp(myTransform.rotation,
    Quaternion.LookRotation(lookDir), rotationSpeed*Time.deltaTime);
    myTransform.position += myTransform.forward * moveSpeed * Time.deltaTime;
}