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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