Bluring in Performer

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Bryan Larson (bryan++at++control.mdc.com)
Wed, 6 Sep 1995 09:11:38 -0700

I am trying to blur a scene in performer. I have used a section of the example
given by SGI called 'geomblur.c'. The following is my blur.c routine:

#include <gl.h>
#include <device.h>
#include <math.h>
#include <stdio.h>
#include <Performer/pf.h>

static float geom = 0.;

void blur(pfChannel *chan, void *data)
{

    pfClearChan(chan);
    pfDraw();
    acbuf(AC_MULT, .8);
    acbuf(AC_ACCUMULATE, 1.0);
    geom = geom*.8 + 1.0;
    acbuf(AC_RETURN, 1.0/geom);

}

This routine then replaces the prDraw function in the Perfly file 'main.c'

I would expect this to blur the image, even if it is generated in Performer,
but is does not seem to work. I don't get a core dump and perfly can load
files ok, but they don't seem to blur.

The question is ...

Am I / Can I use the accumulation buffer in this manner to blur an image in
Performer?

Am I using this correctly?

Is there any hints / advice to bluring an image in Performer?

Thanks

-- 


talk to ya
Bryan


_____________________________________________________________________
                                          |
Bryan Larson                              |  bryan++at++sgidev.mdc.com
McDonnell Douglas                         |      
(310) 593-6766                            |
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