FpsCamera.cs

namespace UmbraGame.Camera
{
    using Microsoft.Xna.Framework;
    using Microsoft.Xna.Framework.Graphics;

    public class FpsCamera : ICamera
    {
        #region Fields

        private readonly MainGame _game;
        private Matrix view;

        #endregion

        #region Properties

        public Matrix View
        {
            get { return view; }
        }

        public Matrix Projection { get; set; }

        #endregion

        public FpsCamera(MainGame game, Viewport viewport)
        {
            _game = game;

            float aspectRatio = viewport.AspectRatio;
            Projection = Matrix.CreatePerspectiveFieldOfView(MathHelper.ToRadians(55), aspectRatio, 0.05f, 500f);
        }

        /// <summary>
        ///     Updates all information regarding the current camera.
        /// </summary>
        /// <param name="gameTime">Time elapsed since last update.</param>
        /// <param name="position">Vector 3 position of which to draw the camera from.</param>
        /// <param name="yaw">The yaw of the cameres rotation.</param>
        /// <param name="pitch">The pitch of the cameres rotation.</param>
        /// <param name="roll">The roll of the cameres rotation.</param>
        public void Update(GameTime gameTime, Vector3 position, float yaw, float pitch, float roll)
        {
            Matrix rotationMatrix = Matrix.CreateFromYawPitchRoll(pitch, yaw, roll);
            Vector3 transformedReference = Vector3.Transform(Vector3.Forward, rotationMatrix);

            Vector3 target = transformedReference + position;

            view = Matrix.CreateLookAt(position, target, rotationMatrix.Up);
        }
    }
}