///<summary>
/// Prepare a viewport, the camera and the scene for a rendering operation
///</summary>
protected void PreTargetOperation(CompositorTargetOperation op, Viewport vp, Camera cam)
{
SceneManager sm = cam.SceneManager;
/// Set up render target listener
listener.SetOperation(op, sm, sm.TargetRenderSystem);
listener.NotifyViewport(vp);
/// Register it
sm.QueueStarted += listener.OnRenderQueueStarted;
sm.QueueEnded += listener.OnRenderQueueEnded;
/// Set visiblity mask
oldVisibilityMask = sm.VisibilityMask;
sm.VisibilityMask = op.VisibilityMask;
/// Set whether we find visibles
oldFindVisibleObjects = sm.FindVisibleObjectsBool;
sm.FindVisibleObjectsBool = op.FindVisibleObjects;
/// Set LOD bias level
oldLodBias = cam.LodBias;
cam.LodBias = cam.LodBias * op.LodBias;
/// Set material scheme
oldMaterialScheme = vp.MaterialScheme;
vp.MaterialScheme = op.MaterialScheme;
/// XXX TODO
//vp->setClearEveryFrame( true );
//vp->setOverlaysEnabled( false );
//vp->setBackgroundColour( op.clearColour );
}
