Ive had that happen if I use a render in image or a GLSL patch with
Quartz Composer and DO NOT use a 'clear' patch. In fact, I quite like
the effect, so I purposefully do it. You sound like you dont :( Im not
rendering to a CIImage, but just passing input and output keys
serially from one composition to another using the opaque QCPortImage
type. Not sure if that makes a difference or if this usage scenario
matches yours in any way, but it might be worth looking into.
On Mar 12, 2008, at 1:04 AM, Neil Clayton wrote:
Hi,
I'm trying to get a CIImage from a QCRenderer object. I've basing
my code on QuartzComposerOffline but then saw weirdness in the
images being returned. I reverted to the original
QuartzComposerOffline project but I find the same thing.
I'm seeing odd artifacts from the display buffer making their way
into the images being generated by the code. The essentials of the
Quartz Composer files are rendered to separate images OK (the qtz
file plays OK in the composer itself and in quick look), but it as
if there is rubbish being pulled from some context in the background
of every image. It's almost as if the background isn't cleared
before each frame is rendered...
Am I running into a well known bugette here? (Im targeting 10.4,
and building using XCode 2.5 (running on 10.5.2))
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