Unity First-Person Camera and Movement Setup

For smooth and jitter-free FPS controls in Unity, use a Cinemachine first-person camera for mouse look and handle player movement with a rigidbody controller. Moving the player happens in FixedUpdate, while mouse look is kept on the camera, avoiding update mismatches that cause jitter. If your camera feels sluggish or stuttery, switch to this Cinemachine setup for consistent results.

What you need before you start

• Unity with a 3D scene set up.
• A player character with a rigidbody component.
• A player controller script that uses the new Unity input system for movement.
• A camera that is initially set as a child of the player (for the old setup, about to be replaced).

Unity Editor displays a simple outdoor scene in the Scene view with a player character, a cube, and terrain. — semikoder

Build the player controller movement

Implement player movement using rigidbody physics and the new Unity Input System. This keeps movement smooth and physics-consistent.

using UnityEngine;
using UnityEngine.InputSystem;

public class PlayerController : MonoBehaviour
{
    public float moveForce = 10f;
    private Rigidbody rb;
    private Vector2 moveInput;

    void Awake()
    {
        rb = GetComponent<Rigidbody>();
    }

    public void OnMove(InputAction.CallbackContext context)
    {
        moveInput = context.ReadValue<Vector2>();
    }

    void FixedUpdate()
    {
        Vector3 move = new Vector3(moveInput.x, 0, moveInput.y);
        rb.AddForce(move * moveForce);
    }
}

Replace the child camera with a Cinemachine first-person camera

Swap your old camera setup for a Cinemachine camera that follows the player's head, eliminating jitter from mismatched update rates.

Wire mouse look through the input controller

Set up mouse movement for looking around, ensuring no input smoothing slows down camera response.

Fix camera jitter by keeping movement and rotation in the right place

Keep physics-driven movement in FixedUpdate and camera rotation (with Cinemachine) on the rendering update path. The old way, where both were mixed, was the cause of jitter.

Add simple noise and camera shake

Add subtle camera sway and feedback effects using Cinemachine’s built-in noise and impulse components.

When to use Cinemachine for a first-person controller

Cinemachine 3 is recommended for FPS controls, as it addresses mouse movement issues that depend on the frame rate. With Cinemachine, movement, camera, and mouse look are handled independently and cleanly. This approach is also ready for use with cutscenes and more advanced camera features later.

Also worth knowing

• Cinemachine 3 is required for proper mouse movement. Earlier versions did not fully fix frame-rate-dependent mouse input issues.
• Set look axis acceleration and deceleration to zero to avoid any lingering lag or sluggishness in the camera’s mouse movement.
• Remove any script that rotates the player body toward the camera every frame as this can reintroduce the lag or jitter you are trying to avoid.

Official reference: Unity manual.

Sources

Screenshots on this page are frames from the videos below, used to illustrate the steps they describe. All rights remain with their creators.

• How to make The Best First Person Camera in Unity — semikoder, May 1, 2024

Checked against:

• Download Archive — Unity