Performer Live-video sirius problem

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Gerhard Empl (100535.3606++at++CompuServe.COM)
18 Apr 96 20:44:01 EDT

 Hello,
 we've the task to incorporate live video into a performer application
 from a Sirius board. It went quite well with 2 exceptions:

 (1) the texture "leaks out" (is applied to) other polygons as well
 unless it is loaded as last one (thats a problem we can live with but
 might be the reason for others).

 (2) the frame rate drops down from 50 to 25 (or 60 to 30) when
 applying the video. We then set the texture loading to be done only
 once via performer and loaded the frame at the end of the drawing loop
 via vl. Surprisingly this call only took a very short time, so the
 Sirius board seems to synchronize itself with the video input blocking
 the raster engine during that period.

 here another formulation of our problems:

 Problem 1:

 Hardware: Onyx RE2 / 4 RM5 / Sirius Option
 Library: Performer 2.0
 Display: 50 Hz

 Problem: We need to get a rendered scene with a live video-input at
              50hz framerate.

 What we do have now:
                We got a stable framerate of 50 hz, but as soon as we
                turn on the live video-input and drain it to the RM, the
                framerate drops to appr. 25 hz.
                We use SIR_TEX_PACK_RGB_5 packing for the tex drain.

 What we tried:
                We tried to draw only the Live-Video Texture --> still
                appr. 25 hz framerate.
                We tried interleaved and non-interleaved --> no effect
                We tried PFTEX_LIST_APPLY and PFTEX_BASE_AUTO_SUBLOAD
                We tried to reduce the texture size from 1024*1024 to
                512*512 --> the machine crashed.

 Question: Is there a way of getting Live-Video- input to texture memory with
 a 50 frames/sec?

 It seems to us that the video-transfer blocks the rendering
 completely, because the sirius option has to wait until it gets a
 complete frame.

 We could also live with a quality penalty of the live input, but our
 framerate has to be stable 50 hz.

 Problem 2:

 Hardware: Onyx RE2 / 4 RM5 / Sirius Option
 Library: Performer 2.0
 Display: 50 Hz

 Problem: How do we get a texture on a loaded graphic e.g: .obj ?

 Problem 3:

 Hardware: Onyx RE2 / 4 RM5 / Sirius Option
 Library: Performer 2.0
 Display: 50 Hz

 Problem: As soon as our Live-video-texture gets into view, it
 sometimes happens that the video-input is drained to the wrong textures.

 It seems that the sirius board sometimes writes into the wrong texture
 memory adress.

 Thank you very much for your help,

 Gerhard Empl, R2
 E-Mail: 100535.3606++at++compuserve.com

  E-mail from: Gerhard Empl, 19-Apr-1996

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