Rigidbody slows down when its going up a slope. What can I do?

Question

I am using unity and I am creating a 3d topdown game. There is no jump feature. The input handling supports only x and z axis player movement. Climbing slopes or falling from gaps is something I want to happen without certain input.

So, I have a rigidbody which I move by directly setting its velocity. When it goes up a slope it slows down.

I would like it to keep the same speed.

Now I do it like this:

    void Update(){
moveInput = new Vector3(Input.GetAxisRaw("Horizontal"), 0f, Input.GetAxisRaw("Vertical"));
}

void FixedUpdate(){

MyRB.velocity = moveInput.normalized * runSpeed
}

I am using a capsule collider on the rigidbody and a box collider for the slope. The physics materials of the colliders are the default/none (not changed).

Answer 1

It entirely depends on how you're moving your rigidbody. If you're manually updating the position each frame (using Translate or movePosition, not AddForce), you can apply a physics material to your sphere collider and set the friction somewhere at or slightly below 1. This allows your rigidbody to grip the sloped surface a bit better.