Jon,
Looks like it's still doing additive blending, but the colours aren't
correct. My guess is that it's related to premultiplied alpha in some
way, as that's given me trouble like this before. I guess the
quickest way to check would be to render the composition in a render-
in-image, pass it through a CI Filter, then output to a billboard.
Then you can see if it's fixed by adding premultiply(pixel) or
unpremultiply(pixel) to the CI filter.
Perhaps it's something else, but I think that's worth a go.
Chris Wood
On 1 Mar 2009, at 15:28, Jon Steinmetz wrote:
Hi there, I have a QC composition that I am using for some status UI
in my app. When I was using a QCView to display the composition it
rendered correctly and matched the viewer in QC.app.
When I switched to using a QCCompositionLayer the particle system
starts rendering incorrectly. In particular it looks like the
blending modes are messed up. Here is the "correct" appearance:
<good.jpg>
And here is the bad:
<bad.jpg>
As you can see the note images in the particle system are no longer
colored but appear to be a washed out yellowish color. The blending
mode for the particle system is "add" but changing it does not make
the view and the QCCompositionLayer match appearance.
I have tried making the QCCompositionLayer opaque and giving it a
solid background color. The composition has an opaque gradient
billboard as a background. Nothing has helped so far.
Searching around I have not found anybody else reporting this issue
but then there does not appear to be many people talking about
QCCompositionLayer in general.
I would be happy to provide my composition but since the issue only
manifests itself in a QCCompositionLayer I would have to make an
example program to show the issue.
Hopefully someone will have encountered this and found a solution
and say you need to set the fliberdyjibbet attribute to "whuzzle"
and it will be fixed. :) I apologize if I have missed something
obvious or not provided some crucial bit on information. Thanks.
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