Godot 3 Scripts

ThirdPersonPlayerController.cs

using Godot;

public class Player : KinematicBody
{
    [Export] public float Speed = 7.0f;
    [Export] public float JumpStrength = 20.0f;
    [Export] public float Gravity = 50.0f;
    
    private Vector3 _velocity = Vector3.Zero;
    private Vector3 _snapVector = Vector3.Down;

    private SpringArm _springArm;
    private Spatial _model;
    
    public override void _Ready()
    {
        _springArm = GetNode<SpringArm>("SpringArm");
        _model = GetNode<Spatial>("Model");
    }

    public override void _Process(float delta)
    {
        _springArm.Translation = Translation;
    }

    public override void _PhysicsProcess(float delta)
    {
        Vector3 moveDir = Vector3.Zero;

        moveDir.x = Input.GetActionStrength("right") - Input.GetActionStrength("left");
        moveDir.z = Input.GetActionStrength("back") - Input.GetActionStrength("forward");
        moveDir = moveDir.Rotated(Vector3.Up, _springArm.Rotation.y).Normalized();

        _velocity.x = moveDir.x * Speed;
        _velocity.z = moveDir.z * Speed;
        _velocity.y -= Gravity * delta;

        bool justLanded = IsOnFloor() && _snapVector == Vector3.Zero;
        bool isJumping = IsOnFloor() && Input.IsActionJustPressed("jump");

        if (isJumping)
        {
            _velocity.y = JumpStrength;
            _snapVector = Vector3.Zero;
        }
        else if (justLanded)
        {
            _snapVector = Vector3.Down;
        }

        _velocity = MoveAndSlideWithSnap(_velocity, _snapVector, Vector3.Up, true);

        if (_velocity.Length() >= 0.2f)
        {
            Vector3 modelRotation = _model.Rotation;
            Vector2 lookDir = new Vector2(_velocity.z, _velocity.x);
            modelRotation.y = lookDir.Angle();

            _model.Rotation = modelRotation;
        }
    }
}

ThirdPersonSpringArm.cs

using Godot;
using System;

public class SpringArm : Spatial
{
    [Export] public float MouseSensitivity = 0.05f;

    public override void _Ready()
    {
        SetAsToplevel(true);
        Input.SetMouseMode(Input.MouseMode.Captured);
    }

    public override void _UnhandledInput(InputEvent @event)
    {
        if (@event is InputEventMouseMotion mouseEvent)
        {
            Vector3 rotation = RotationDegrees;
            
            rotation.x -= mouseEvent.Relative.y * MouseSensitivity;
            rotation.x = Mathf.Clamp(rotation.x, -90.0f, 30.0f);
            
            rotation.y -= mouseEvent.Relative.x * MouseSensitivity;
            rotation.y = Mathf.Wrap(rotation.y, -0.0f, 360.0f);

            RotationDegrees = rotation;
        }
    }
}