I have a very strange problem with my latest screensaver.
Everything renders perfectly in QC... but when I view it as a
screensaver, one of the images (which forms the gas cloud from the
exploding star) has lots of artifacts in its alpha channel. In
other words, the coloring is correct, but the alpha has tiny little
rectangles cut out of it. This only happens in the screensaver
(both preview and full screen) and never in QC.
What could be causing this?
In Quartz Composer, when rendering the same composition, go into the
Viewer menu and disable background erasing. The rendering will then
be the same as in any application. If you observe the same artifacts,
then it means the color buffer or depth buffer is not cleared
completely:
Add a Clear patch to the composition and change its settings in the
Inspector accordingly.
