Hello Carl,
I think it may be connected to the gaussian blur patch. You may remove
it to proof it. As I can't see the effect on my machines, I couldn't
test it here. I think that the way you defined the text image size
(fixed image width with "5") you properly make up too big textures. In
addition the gaussian blur has to create bigger textures because it
adds some pixel to the boundary so this may fail to create them. I am
not sure about this. Maybe you should switch the "image with string"
patch to use pixel dimensions instead of QC units, so you have a
better control on how big those textures can get.
Anyways, some tips for your composition:
1) Set all you interpolation modes of the interpolation patches to
"Quadartic in/out", this helps the text to wobble around in a smooth
way with no harsh stopping.
2) As I mentioned: the gaussian blur adds some pixel to the image
boundary, it does so depending on the blur radius. This causes your
background "01000111"-image to "hop" from time to time, because you
changes the radius over time, so the images suddenly has a different
pixel dimension. One solution is to crop the image after the gaussian
blur patch to its original size (but with this you will get a cropped
blur border also. Another solution is to crop it to the biggest size
you ever will get for your blurred image, but then you will have a gap
in your background... Its up to you ;-)
best,
Achim Breidenbach
Boinx Software
On 26.07.2010, at 15:07, Carl wrote:
In the attached patch I get an occasional blank frame, when I render
it to video this shows as a frame of rubbish. I know this is
probably a basic fault of my "programming" but I am stumped as how
to keep the patch looking the same but without the glitch. I tried
on my old MacBook and a couple of different new iMacs and the result
is the same. I guess I am going outside the image bounds? Anyway it
is quite hard to see when in QC but basically sprites sometimes
blank out.
I don't really make software exactly but use QC to composite video,
usually rendering with Kineme QuartzCrystal app.
I am currently making a short experimental film about internet scams
and have made this patch to overlay onto some video.
If any of you kind souls could take a look and tell me where I am
going wrong I would be very happy! I know I am a total "lurker" on
the list and pretty much leeching some help here but it would be so
cool to hand in my film for my MA and be able to say I made the
effects in Quartz Composer.
Cheers
Carl
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