QC uses two sets of measurements, which can be a bit confusing at first.
In some places it uses pixel sizes, so e.g. if you wanted to resize
your video input you would resize it to say 320 x 240 pixels.
In other places it uses QC units, which let you position things on
screen without worrying about what happens when the window gets
resized. The view is 2 units wide, from -1 to +1, so 0 is in the
centre. For height, 0 is in the centre, but the top and bottom depend
on the aspect ratio, so for a wide window it's usually 0.6 or so.
So to get your image filling the window, just set the width to 2, and
QC will handle resizing etc. 'Pixel aligned' just means that the image
will be lined up to the nearest pixel - otherwise you might have it
set so that it's "between pixels" which causes a little blurring.
You can also change the size mode in the settings of the billboard
patch - 'real size' will draw it 1:1 on screen, so it will fill
exactly 640x480 pixels, all the other modes use QC units.
Chris
On 18 Aug 2009, at 11:01, [email protected] wrote:
Hi Folks,
first, this is probably a fairly dumb question. I'm still trying to
get to grips with QC fundamentals.
Basically, I'm playing round with displaying multiple images in the
QC Viewer. I'm curious, how does it handle image sizes and
resolutions?
I have video input which I believe from the built-in iSight camera
is 640 x 480. The Viewer puts this as a default in the centre. It's
about half the size of the Viewer window, and resizes automatically
(see attached).
Any idea how this works? Or even if it's something I need to bother
with? I have a look at Apple's documentation but it doesn't have
much info. I see parameters like "Pixel Aligned" for the billboard
renderer but there doesn't seem to be much info on what they do.
Many thanks,
Max
_______________________________________________
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/psonice%40gmail.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]
