Hi Alessandro, any chance of posting a simple example QC of this technique in action?
Incidentally, I'm having real trouble managing to post to this list. My posts keep bouncing, with a message from my mail server saying they had failed (after several hours trying) to get a response from the list's server. The vast majority of the emails I send to the list now bounce in this way. I've also had emails sent to private 'mac.com' addresses bounce, so I don't know if it's a problem that's endemic to Apple's mail servers. I've been able to send emails from this account to others addresses, so I don't think it's a problem at my end... alx --- Alessandro Sabatelli <[EMAIL PROTECTED]> wrote: > Use a sprite and image texturing properties instead > of cropping, to > grab each scanline inside an iterator inside a > render in image. > .xX > > On Nov 12, 2007, at 1:40 AM, Oliver Donald > <[EMAIL PROTECTED]> wrote: > > > Thanks, Allan > > > > I've tried this but the performance dips down to > about 3fps with 60 > > image strips (ideally I would have as many strips > as there are > > horizontal scanlines in the video!). I think this > is down to the > > overhead of having so many Billboards, although > having many Crop > > patches > > might also be the culprit. A queue patch with > 100's of frames of video > > runs at a solid 60fps, so I don't think that is > the issue. > > > > I was hoping there was some way of rendering these > crops directly to a > > single patch, almost like an Accumulator that > worked as a macro > > object. > > 'Render In Image' is *almost* what I want, but > with that you still > > need > > to render to a destination first. > > > > Would it be hard to write an 'Iterator > Accumulator' patch that > > accumulated across an iterator, rather then across > time like the > > current > > one does? (if that makes any sense!) > > > > Thanks > > Oli > > > > -----Original Message----- > > From: Allan Schaffer [mailto:[EMAIL PROTECTED] > > Sent: 09 November 2007 17:04 > > To: Oliver Donald > > Cc: [email protected] > > Subject: Re: Efficient way to build images from > multiple parts > > > > > > On Nov 9, 2007, at 3:08 AM, Oliver Donald wrote: > >> I've got a video stream that has been split into > numerous horizontal > >> strips, 32 in total. Is there a simple way to > combine these strips > >> back > >> into a single image? > >> > >> Chaining together 'Composite Add' operators into > a tree works, but is > >> computationally expensive, hard to set up, and > worst of all it > >> produces > >> graphical artifacts. > >> > >> I can use multiple billboards, but again this > requires quite a lot of > >> work. > >> What I really want is a common, shared > destination that my 32 Crop > >> operators can all write to, is this possible? > >> > >> Is there a better way altogether? > > > > > > My first stab at this would be to draw multiple > billboards (probably > > within an iterator, and using a math patch to > calculate a Y offset for > > each billboard) and assuming Leopard & QC3.0, put > the whole thing in a > > "render in image" patch to get a single composite > image as a result. > > > > ie, result = render in image ( iterator ( > billboard > > ( math(iterator index), input source(iterator > index) ) ) ) > > > > Allan > > ___________ > > > > Allan Schaffer > > Graphics Evangelist > > Worldwide Developer Relations > > > > > > _______________________________________________ > > Do not post admin requests to the list. They will > be ignored. > > Quartzcomposer-dev mailing list > ([email protected] > > ) > > Help/Unsubscribe/Update your Subscription: > > > http://lists.apple.com/mailman/options/quartzcomposer-dev/asabatelli%40apple.com > > > > This email sent to [EMAIL PROTECTED] > _______________________________________________ > Do not post admin requests to the list. They will be > ignored. > Quartzcomposer-dev mailing list > ([email protected]) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/quartzcomposer-dev/the_voder%40yahoo.co.uk > > This email sent to [EMAIL PROTECTED] > ___________________________________________________________ Yahoo! Answers - Got a question? Someone out there knows the answer. Try it now. http://uk.answers.yahoo.com/ _______________________________________________ Do not post admin requests to the list. They will be ignored. Quartzcomposer-dev mailing list ([email protected]) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/quartzcomposer-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]
