"Alex, multiple of the stock feedback patch examples are image feedback. You were correct, imo, as Apple has submitted that to us as valid."
...Just looked. I see that the vid feedback example qtz does incorporate an accumulator. I guess if that doesn't leak, all is well :) -gt On Feb 10, 2011 7:14 AM, "Alex Drinkwater" <the_vo...@yahoo.co.uk> wrote: > I've marked the RADAR as 'resolved'. cwright, I realise I was being > unreasonable. I think because QC has such a friendly face, the fact > it can do fairly low-level (and therefore potentially dangerous) > stuff is easy to lose sight of, especially for non-programmers like > myself. However, I do think that a little note added to the tooltip > and Library window documentation to the effect that it's safer to use > the Core Image Accumulator for image-based feedback might be helpful, > to prevent others falling into the same trap. People like myself not > familiar with the behind the scenes Core Image nuts and bolts, are > far more likely to reach for the Feedback patch to do... well, > feedback effects, than they are for the more obscurely-named Core > Image Accumulator. So I'm backing down as gracefully as I can manage > in the face of superior knowledge, but still partially sticking to my > guns ;) > > > a|x > > > > > > > > On 10 Feb 2011, at 06:30, George Toledo wrote: > >> Oh, sorry. I didn't catch that post, in the flurry that happened in >> a short time there. >> >> >> >> On Thu, Feb 10, 2011 at 12:35 AM, Christopher Wright >> <christopher_wri...@apple.com> wrote: >> > Is there anything problematic with this kind of image feedback >> setup? This always seems to work better than using the accumulator >> or feedback patch for me. I'm monitoring for leaks on two different >> gpu's right now, in leopard and sl, and it looks ok. >> >> Render in Image is fine. As I said a few emails ago: >> >> > The shader version uses Render In Image, which is little more >> than a fancy FBO. It doesn't need to keep around intermediate >> results beyond the previous frame used as input. This means it >> uses less memory, but also means that it's somewhat less accurate >> with certain operations. >> >> Render In Image also has the convenient side effect of flattening >> CI Filter chains when used. Thus, the following (which still uses >> CI for the filter effect) is totally fine. >> >> >> Using the RII to flatten comes in handy in a variety of circumstance. >> >> Side notes - Some operations happen very quickly when implemented >> in with the GL objects, like Billboard (like this RII vs. >> Accumulator, or mocking up a box blur with billboards vs. CI). (It >> also happens to be handy for sanitizing the intensity image from >> the kineme kinect tools so that CI doesn't freak out... to any of >> those who have experienced weird problems with that). >> >> >> >> Of course, this is all _completely_ obvious to the casual >> observer ... or something? :) >> >> Totally. >> >> By the way... I noticed last week that when I do an RII feedback >> loop with anything less than 32 bit, it leaves a layer of crud at >> the last bit that never clears (I believe). Totally obvious stuff :) >> >> -- >> Christopher Wright >> christopher_wri...@apple.com >> >> >> >> >> >> -- >> George Toledo >> gtole...@gmail.com >> www.georgetoledo.com >> >> The information contained in this E-mail and any attachments may be >> confidential. >> If you have received this E-mail in error, please notify us >> immediately by telephone or return E-mail. >> You should not use or disclose the contents of this E-mail or any >> of the attachments for any purpose or to any persons. >> >> _______________________________________________ >> Do not post admin requests to the list. They will be ignored. >> Quartzcomposer-dev mailing list (Quartzcomposer- >> d...@lists.apple.com) >> Help/Unsubscribe/Update your Subscription: >> http://lists.apple.com/mailman/options/quartzcomposer-dev/the_voder% >> 40yahoo.co.uk >> >> This email sent to the_vo...@yahoo.co.uk > -- George Toledo gtole...@gmail.com www.georgetoledo.com The information contained in this E-mail and any attachments may be confidential. If you have received this E-mail in error, please notify us immediately by telephone or return E-mail. You should not use or disclose the contents of this E-mail or any of the attachments for any purpose or to any persons. -- George Toledo gtole...@gmail.com www.georgetoledo.com The information contained in this E-mail and any attachments may be confidential. If you have received this E-mail in error, please notify us immediately by telephone or return E-mail. You should not use or disclose the contents of this E-mail or any of the attachments for any purpose or to any persons.
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