Axiom.Demos.FrustumCulling.OnFrameStarted C# (CSharp) Method

		protected override void OnFrameStarted( object source, FrameEventArgs evt )
		{
			base.OnFrameStarted( source, evt );
			if ( evt.StopRendering )
				return;

			objectsVisible = 0;

			float speed = 35 * evt.TimeSinceLastFrame;
			float change = 15 * evt.TimeSinceLastFrame;

			if ( input.IsKeyPressed( KeyCodes.I ) )
			{
				frustumNode.Translate( new Vector3( 0, 0, -speed ), TransformSpace.Local );
			}
			if ( input.IsKeyPressed( KeyCodes.K ) )
			{
				frustumNode.Translate( new Vector3( 0, 0, speed ), TransformSpace.Local );
			}
			if ( input.IsKeyPressed( KeyCodes.J ) )
			{
				frustumNode.Rotate( Vector3.UnitY, speed );
			}
			if ( input.IsKeyPressed( KeyCodes.L ) )
			{
				frustumNode.Rotate( Vector3.UnitY, -speed );
			}

			if ( input.IsKeyPressed( KeyCodes.D1 ) )
			{
				if ( frustum.FieldOfView - change > 20 )
				{
					frustum.FieldOfView -= change;
				}
			}

			if ( input.IsKeyPressed( KeyCodes.D2 ) )
			{
				if ( frustum.FieldOfView < 90 )
				{
					frustum.FieldOfView += change;
				}
			}

			if ( input.IsKeyPressed( KeyCodes.D3 ) )
			{
				if ( frustum.Far - change > 20 )
				{
					frustum.Far -= change;
				}
			}

			if ( input.IsKeyPressed( KeyCodes.D4 ) )
			{
				if ( frustum.Far + change < 500 )
				{
					frustum.Far += change;
				}
			}

			// go through each entity in the scene.  if the entity is within
			// the frustum, show its bounding box
			foreach ( Entity entity in entityList )
			{
				if ( frustum.IsObjectVisible( entity.GetWorldBoundingBox() ) )
				{
					entity.ShowBoundingBox = true;
					objectsVisible++;
				}
				else
				{
					entity.ShowBoundingBox = false;
				}
			}

			// report the number of objects within the frustum
			debugText = string.Format( "Objects visible: {0}", objectsVisible );
		}