Hi,
I did not test it yet, but there is CATiledLayer available as well. If
CoreAnimation is an option for you.
Raphael
On 05 Jan 2008, at 16:08, Michael Kwasnicki wrote:
I tried around a bit and in my eyes it is not real-time-able to
browse such huge files using QC.
The largest image displayable remains 4096x4096.
I was able to display an image of 10.240x6400 but no longer in real
time since my 256MB VRAM is not big enough to store this tiled
image. So there is a lot of stuff keept in the system memory and
exchanging it with the graphics card reduces the frame rate massively.
I've attached the best I was able to get. Just exchange the image
and adjust the tileSize for your needs.
If you are realy thinking of a 30,000x30,000 zoomed and paned in
real time then I suggest to take a look at id Softwares Megatexture-
Technology. The main idea is to only keep loaded what you are realy
able to see in a given time. So load low resolution tiles and if
zoomed in beyond some point, then load a higher quality image on the
fly and also unload portions you can't see. id Software has done it
with some progressive loading image stream. maybe something similar
to JPEG2000. Sorry I can't find a better description.
http://en.wikipedia.org/wiki/MegaTexture
-Michael
<Scroll3.qtz>
Am 05.01.2008 um 04:09 schrieb vade:
On Jan 4, 2008, at 6:30 PM, Michael Kwasnicki wrote:
Hello Vade,
the Billboard is not a normal OpenGL 3D object which has texture
coordinates (what I was tweaking using Image Texturing Properties
patch) and stuff. Billboard is just a flat thing. I imagine this
is something like it just overwrites everything in the frame
buffer byte wise in the last rendering step.
Im aware you were tweaking the texture properties patch :P
I'm not that skilled with Objective-C and native OS X APIs.
I just use low level OpenGL and GLUT with C++.
But when going down to OpenGL then I'd try Christopher Wright
suggested.
It's not that difficult to implement once the image data is loaded
into the memory.
Just a few calculations how many tiles we need and then copy the
bytes.
But I don't know how to map them if not on sprites ( or GL_QUADS
when using low level OpenGL ).
Since this is a QuartzComposer mailinglist I assume you can access
Quartz APIs.
Why not tile the images, map them on sprites and then use the
"Render in Image" patch.
Then you have something you can render using a Billboard.
I think this is the best solution yet. I dont need to do any major
changes in my quartz plugin, and I suspect this will just work for
my scenario as well. Thanks, thats an elegant approach.
It works still real time for me when I put my approach into a
render in Image patch.
I'll try to write an QuartzComposition which automatically tiles
an image and renders the resulting pan zoom stuff into an image
ready for Billboard.
-Michael
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