protected override void InitializeSettings(ParticleSettings settings)
        {
            settings.TextureName = "explosion";

            settings.MaxParticles = 100;

            settings.Duration = TimeSpan.FromSeconds(2);
            settings.DurationRandomness = 1;

            settings.MinHorizontalVelocity = 20;
            settings.MaxHorizontalVelocity = 30;

            settings.MinVerticalVelocity = -20;
            settings.MaxVerticalVelocity = 20;

            settings.EndVelocity = 0;

            settings.MinColor = Color.DarkGray;
            settings.MaxColor = Color.Gray;

            settings.MinRotateSpeed = -1;
            settings.MaxRotateSpeed = 1;

            settings.MinStartSize = 7;
            settings.MaxStartSize = 7;

            settings.MinEndSize = 70;
            settings.MaxEndSize = 140;

            // Use additive blending.
            settings.BlendState = BlendState.Additive;
        }
 /// <summary>
 /// Derived particle system classes should override this method
 /// and use it to initalize their tweakable settings.
 /// </summary>
 protected abstract void InitializeSettings(ParticleSettings settings);