Rigidbody Keep Vertical Without Applying Rotational Constraints

Questions & Answers
1

Hi,

I have a situation where i need a rigidbody character to remain perpendicular to the surface beneath the player, this is not always guaranteed to be in the Y direction for instance if the character was walking up a “vertical” wall. To move the rigidbody i am manually setting the velocity, this causes the rigidbody to topple over which is not what I want.

My question to you is, how can I make my character remain perpendicular to the surface beneath it using C# code? My character uses a ray cast down to detect whether he is grounded and I can use the normal from that to get the target rotation.

Thanks

2

If you mean making the player stick on whatever’s beneath it, I have this js code.

var hit : RaycastHit;

function Update (){
	if(Physics.Raycast (transform.localPosition, transform.TransformDirection (Vector3.down), hit)) { 
		transform.localPosition = hit.point; 
		transform.rotation = Quaternion.LookRotation (transform.TransformDirection (Vector3.forward), hit.normal);
	}
}

I think it’s same for C# except for the variable and “function” would be “void”.

3

Vector3.cross(a,b)

If you give it up which is the hit. Normal as a and right which is transform. Right it will give you the third parralel which is forward.

This will ensure left and right remain the same locally and all that changes is what’s considered up so you can stick objects together.

Post if you need more help or more detailed code example