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		PanbScreen
		Quartz Composer Screen Saver

Introduction:

PanbScreen is a very simple screen saver developed just to play with Quartz Composer. As a result, it will need MacOSX Tiger (10.4) to run. What it does is to display panoramic images proposed on the Panberra web site :

Panberra : Panorama in Canberra

http://www.vrarchitect.net/panorama/index.en.html

To get the most recent images from the web site, PanbScreen read the RSS feed provided for each category of panoramic image.

What is new ?

System Requirements:

• A Macintosh running Mac OS X version 10.4 or higher.
• A network connection

Installation:

0) Dowload the the zip package : panbScreen_1_1.zip

1) click panbScreen_1_1.zip archive to open it, if it did not happen automatically.

2) You may want to play a little with that quartz composition by just clicking the Panberra.qtz file to open it  into Quartz Composer

3) If you want that composition to become one of your screen saver, just drag it into one of the following directory :

a) ~/Library/Screen Savers/ (~ is your home directory) if you want the screen saver to be used only by you

b) /Library/Screen Savers/ if you want the screen saver to be available by all your users

Configuration / Parameters:

The parameter you are able to set for this composition are the following :

Screen capture from version 1.0

• Hor. sweep (50s) : Horizontal weep : time it take to look around the full 360 degree panorama from left to right, in seconds. 50 s is the reminder of the default value.
• Ver. sweep (50s) : Vertical seep : time it take to sweep from the top to the bottom and return, in seconds. 50 s is the reminder of the default value. You may want to desynchronise the two sweep by chosing a diffrent period for each, in order to not look always at the same directions.
• Ver. Amp. (50deg) : How much up and down we are looking when we sweep trough the panorama vertically. The value is the angle in degree from the horizon. Just set 0 if you do not want to oscillate vertically.
• Img every x min : How often the screen saver download an image from the list proposed in the RSS feed.
• Zoom : Zoom in the panorama 0.1 is a very large angle to see almost half of the scene, but with lots of distortion. 2.6 is an extremely focused small angle to look only at details of the images.
• RSS list of Images : RSS feed that point to the equirectangular panoramic images that will be displayed. The default feed is the one provided by the Panberra web site. There are as much feeds on this site than categories of panoramic images. Chose any list in English or French, grab the URL and replace the 'html' suffix by 'rss' to use the matching feed :
• http://www.vrarchitect.net/panorama/photo/index.en.rss : the default list : all the more recent panoramas with a title in English
• http://www.vrarchitect.net/panorama/photo/index5.en.rss : the panoramas published during the "World Wide Panorama" event
• ...
• Random first Image : If set to true, the first image will be chosen at random in the list provided by the RSS feed. That random index will be modified each time the feed is updated (as specified in Safari's preferences : When does the RSS Feed patch in Quartz Composer refresh its contents).

You may want to create your own RSS feed. Just grab one of the proposed one as an example. As for now, the important field to edit are the "title" and "link" attributes.

Troubles / Bugs:

As the screen saver is downloading high resolution images from the net, it may seem slow to start. Don't worry, it will start eventually. A message inform you about the image title which is being download.

One way to make it faster is to use a local feed pointing towards local images.

Similarly, because the images are cached by quartz composer, when you want to stop the screen saver, it seems that it take some time when lots of images had been cached.

Sponsor / copyleft:

If you enjoy playing with this little tool, you may want to add a link from your web site to mine.

This type of software is called a "linkware".

Contact:

Pascal Vuylsteker <pvk@vuylsteker.net>

http://www.vrarchitect.net/