protected override void OnMouseMove(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
var dx = MathF.ToRadians(0.25f * (e.X - _lastMousePos.X));
var dy = MathF.ToRadians(0.25f * (e.Y - _lastMousePos.Y));
_camera.Pitch(dy);
_camera.Yaw(dx);
}
_lastMousePos = e.Location;
}