Re: Missile Trails

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Angus Dorbie (dorbie++at++sgi.com)
Mon, 06 Apr 1998 11:32:10 -0700

> Sorroche, Joe CEI-TACCSF wrote:
>
> People;
>
> I'm working with Suzi Bemis on our Performer upgrade at
> TACCSF. I'm working on missile trails. I got some Open GL code from
> the training course which creates a missile trail, then attaches it to
> a model using the model's present location. I converted the code to
> Iris GL, then put the function call after a missile is fired, and the
> GL draw code before our HUD function is drawn. The missile trails are
> drawn on our HUD. Next, I put the GL code in PostDraw, and it seems
> PostDraw is never called. I have two questions. First, is there a
> way to draw a missile trail using performer functions rather that Iris
> GL, and second, where would one put the function call and draw code?
>

Sorry here's the answer to your second question.

Make the call to draw the missiles immediately after you call pfDraw
in the channel draw callback, if you use the gl.

Perfly is a bit screwed up because it has redundant application level
callbacks and callbacks within callbacks instead of simply leaving it
to the programmer to use the Performer callbacks. Look for the pfDraw
call and follow the calls in the rest of the channel draw callback and
you'll see what I mean.

Cheers,Angus.

-- 
"Only the mediocre are always at their best." -- Jean Giraudoux 


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