Re: Dynamic Volumes

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Rémi Arnaud (remi++at++remi.engr.sgi.com)
Mon, 16 Jun 1997 17:06:55 -0700 (PDT)

Jeff Brickley wrote:
>
>
> I have a group of dynamic volumes, that have half or all of the
> vertices changing every frame. What is the best way to render this?

 pfCycleBuffers (pfFlex in 2.2) should be used to handle the vertices
 (or anything else) that change in real time

> I have
> normally use OpenGL commands to "add" these to the scene in a post-render
> routine, however, I was wondering if a Performer GSet was capable of
> handling it's vertices change every frame or any other Performer object
> could. Would rendering this in Performer save any time vs. rendering it in
> OpenGL...?

 It doesn't make any difference if your OpenGL code is as optimized than
 the OpenGL calls performer does.

> Our application is running borderline on 20hz Performance and I
> am trying to make sure we are applying everything in the most efficient
> manor. All of the volumes rendered require transparent solid and wire-frame
> rendering so that the controller can understand the current shape of the
> object.
  
  WireFrame is slow, it is faster to draw a polygon than a line.

> I'm sorry to say the object is not rendered by itself, it is
> inserted into a full simulation with landscape and models, through which the
> operator can move through to see events happening in real-time....
>
> A related question, what is the fastest mode for transparency rendering on
> the Infinite Reality?

  Multisample transparency is the easiest way to handle transparency
  as it avoid sorting the database.

>
> System Configuration: Infinite Reality Onyx with 16 R10000 Processors
> dual pipe (only one pipe in use for this application)
> 4 RM-6s per pipe.
> IRIX 6.2
>
> Software: Coryphaeus Easyscene V3.0 (4.0 Beta is available)
> Performer 2.1 (2.2 beta is available if necessary)
> Patches should be current (I hope)
>
> Jeffry J. Brickley
> 3D Systems Programmer
> Lockheed Martin
> White Sands Missile Range, NM
>

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