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Re: Viewing Full Screen Panos



From: David Goldwasser <email@hidden>
Date: Wed Jun 11, 2003  3:33:29  PM America/Denver
To: <email@hidden>
Subject: Viewing full screen panos on 500mhz ibook


Although I9d love a 12inch powerbook I9m not ready for that so I9m often
showing my work off on my 500mhz ibook.


Now I9d like to show off my work in full screen for obvious reasons, but
when my screen is set to 1024x768 its really jerky movement. Now when I
scale up a linear movie to present on screen I get the feeling it does a
temporary screen resolution change on its own.


With a pano it does not and is trying to render the full 1024x768 on the
fly. I can get around this by actually changing the monitor resolution on
my own to 800x600 (pretty good movement) or 640x480 (very smooth). But I was
wondering if there was an easier solution that does not have to make me go
through this step or to leave my computer at an un-necessary low resolution.


By the way, I may have brought this up before but has anyone viewed full
screen panos on a tablet PC, I would think that it must be pretty cool. I
still think Apple has one on the horizon, my logic being the existence of
3ink2 as a prototype handwriting recognition. I think specs would be more in
line with ibook than work horse but with video boosted for good presentation
performance.



I don't know that I have a solution, but maybe I can shed some light on why the jerky movement happens and some of what I have done to combat it.
This jerky movement you've noted is related to the way the QT Movie Player is going through the tiles that have been sliced up from the pict file. The player has RAM buffers that handle the tiles while the loading and unloading of these tiles is going on during the rotation. I know one person that calls it "tile banging". This is what I found can exacerbate this jerking movement.


1. If the source images are much larger than the window size chosen for the movie the RAM buffers can be easily be outstripped by the tiles. The movie window height shouldn't be a lot smaller than the vertical dimension of an individual source file. Say maybe a factor of ,3
2. I also have a 500mhz iBook and the VRAM with these little darlings is right at the edge of good response for 1024x768 resolution. THe lower resolutions require less VRAM, so you have more of it left over to handle things like a movie.
3. Full Screen movie playback is really going to demand some VRAM, so...maybe bigger isn't always better. I'd recommend keeping the screen resolution higher, and movie frame smaller. I personally prefer the "jewel" like quality of smaller images as opposed to the big "in your face" images. <shrug> Smaller images seem more "intimate" to me.


My 2". Maybe there are some secrets about high res VR movies I don't know. I just know nearly everywhere I go to look at a panoVR, I see "tile banging" to some extent. That balance of source file to movie window ratio is pretty important though.

--
John Lee
Apple Certified Technician
208.368.0054
http://myweb.cableone.net/stellar808/
.::. If I am in harmony with my family, that is success .::.
(Ute')
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