I¹m trying to implement a spotlight-type effect in a QCComposition presented in a QCCompositionLayer. I want this to be implemented as a composition, without mucking with the layer. I do change the layer¹s scale and position as needed. This is in a family of effects in which the user picks what .qtz file to use. The QCCompositionLayer overlays the main presentation layers. I want the QCCompositionLayer to dim everything behind it, leaving a clear undimmed circle.
I have been able to get this effect in the QC rendering view, using a full-screen image billboard behind my effects billboard. However, when I use it (without the full-screen image billboard ) in in the QCCompositionLayer in my main program, the effect comes out reversed, i.e., the circle is dimmed and the background is undimmed obviously, not what I want. Any suggestions as to how I can get the desired effect, preferably without changing the QCCompositionLayer itself?
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