Infinite Reality Pixel Processing

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Hill_Brian++at++amelnx.advmar.com
Wed, 27 Mar 96 20:18:29 EST

Hello out there in performer/SGI land.

Does anyone have any experience with the Infinite Reality systems?

Here are some numbers I have heard and that form the basis of my question:

        RM performance 155 Mpixels/sec/RM
        DG performance 310 Mpixels/sec

I have a situation where I want to run 6 channels 1024x768 from a
single IR pipe with an MCO. My calculation for pixel performance would be:

First look at RMs:

1024 x 768 x 30 Hz x 2.5 depth x 6 channels = 354 Mpixels

This would require 3 RMs. 3 x 155 = 465 Mpixels which is more than 354.

Now look at DG:

1024 x 768 x 60 Hz x 6 channels = 283 Mpixels

This should work because 283 < 310.

I heard from someone who heard from someone (who might have been
an SGI sales rep) that the only way to do this was to reduce the
Display Generator scan rate from 60 Hz to 50 Hz.

Can someone tell me if this is true or not?

Running at 50 Hz would limit my realistic scene update rate to 25 Hz
which isn't OK.

I am very interested in knowing if and why I would have to do this?

Thanks,

Brian

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