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
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