Hi Charlie, if you want the crawler to span across the entire screen you can use a function specific to the Billboard patch. The Billboard patch can automatically crop it's content to the display resolution before rendering to it, which is needed here as the image texture size can easily exceed the hardware limits with long strings and large font sizes. So this functionality (in the patch settings -> Inspector, second pulldown entry) saves a lot of hassle (and a lot of patches). To have the crawler display the text seamless you ineed need two instances of the string display.
Please see my attached, simple example comp. Should be smooth as butter. Btw. sometimes it helps to add a slight motion blur, especially on slow displays. Take care, hope this helps Oli
crawler_simple.qtz
Description: application/quartzcomposer
On 04.11.2010, at 15:22, Charlie Francis wrote: > Hi Guys, > > I have just finished creating a little text crawler, and was wondering if > anyone has any ways of improving it. I know this isn't exactly the place for > Code Reviews, but I'd be very grateful to anyone who has the time to look > over my compositions and help me improve and understand the wonderful world > of Quartz a bit more. > > > I built the composition to animate the text across the whole width of the > composition, but it can easily be change to run on another fixed size. The > text scrolls from the right to left, using the image crop path. I did it this > way, instead of just moving the x position, because with very long text > strings the quality of the image degrades quite considerably, and using the > image crop patch seems to keep the text rendering clear. > > You can specify a speed at which the text travels across the screen, instead > of a fixed duration period. I thought this would be better as you can change > the text, and not worry about it whizzing across the screen, or taking a > million years to move. > > > I do have a few issues I'd like to fix, the first is that it can be a bit > juddery, but I expect that this can't be fixed due to how quartz animates. > > The second issues I would like to solve is that the text animates all the way > off, before the animation starts again. I would like the crawler to be > seamless, or (wishful thinking) be able to set a specific width to leave as a > gap. > I was thinking about generating 2 images from the string, animating one, then > animating the next, then pausing the first, and so on. But I'm not sure how > this would effect performance. > > > Once again, thanks to any one that replies! > > Regards, > Charlie > <text_crawler.qtz> _______________________________________________ > 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/oliver.busch%40googlemail.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/archive%40mail-archive.com This email sent to [email protected]
