Case 2: Three stereoscopic displays
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An exhibition by Peter Morse titled "Antarctica Virtua" at the John Curtin Gallery,
Curtin University, Perth,
February to March 2007.
This exhibition consisted of a total of 5 stereoscopic displays but the main
work comprised of 3 stereo displays side by side and each approximately 2.5m wide.
Each screen is driven from one Mac with a Matrox DualHead2Go card, although this
wasn't strictly necessary for the G5. The 2048x768 canvas supplied by the Matrox
card has the left eye image on the left (1024x768) and the right eye image on the right
half. As such each frame of the QuickTime movie is made up of the left and right
eye side by side.
Issues and Questions
Stereoscopic image examples (single frames from stereoscopic movies)
- What is it that causes the huge performance drop as soon as movies hit the 2048
pixel wide bound? For example, at 2046 they easily play at the desired 25fps, at 2048
they play at a few frames per second!
- It would have been advantageous to run the three wall display from a single
computer. This would have allowed more scope for relating the content between the
displays. At what stage will the hardware be capable of this?
[Note that Quartz Composer that ships with Developer tools 3.X and Leopard has
this functionality, namely network based communication between machines, see
case study 8].
- Why can't the iMac display be turned off or disabled?
This seriously limits it's usefulness for many exhibition projects where only the projected
display is required. In the case of many dark environments such as planetariums, the light
from the display is an issue.
- What exactly happens on a iMac in mirror mode when the external display is at
a higher resolution than the internal display? Is everything drawn twice or is one
display a scaled version of the other?
Combination of Mac Pro and 24" iMacs, each with a Matrox DualHead2Go box.