kamizi noboru (kamizi++at++hp99.tis.co.jp)
Fri, 28 Mar 1997 13:14:09 +0900
I posted about using accumlation buffer in Performer.
I wrote:
> (1)How to setup Accumlation Buffer ?
>
> (2)Where can I call acbuf(IRISGL) or glAccum(OpenGL) function ?
>
> (3)Is there any sample source code ?
And I get good advices.
I understand that I can use Accumlation function in Channel DRAW process callback.
And sample source from Olivier Schreiber works fine. I get good motion blur effect.
thanks very much !!!
then,I am Interested in follows.
Madhu Sethi wrote:
> Drawfunc(..)
> {
> channel->clear();
> // set matrices
> pfDraw();
> **accumulate via GL/OpenGL**
>
> etc...
>
> }
>
> In here, after calling pfDraw(), you can accumulate. Then you reset your
> viewing position or scene, call pfDraw() again and accumulate, etc.
Can I call pfDraw() multi times in DrawFunc callback ?
I think If view and object position moved,It need CULL with DRAW.
But, DRAW and CULL is running another process.
When pfCull() call ?
Does pfDraw() call pfCull() automatically ?
If I can do follows,I can get maltipass effect.(I understand it is slow).
Drawfunc(...)
{
channel->clear();
movingViewPosition(0.25);
movingObject(0.25);
pfDraw();
acbuf(AC_ACCUMULATE, 0.25);
channel->clear();
movingViewPosition(0.25);
movingObject(0.25);
pfDraw();
acbuf(AC_ACCUMULATE, 0.25);
channel->clear();
movingViewPosition(0.25);
movingObject(0.25);
pfDraw();
acbuf(AC_ACCUMULATE, 0.25);
channel->clear();
movingViewPosition(0.25);
movingObject(0.25);
pfDraw();
acbuf(AC_ACCUMULATE, 0.25);
acbuf(AC_RETURN, 1.0);
}
Thanks very much.
-------------------------------------------------------
Noboru Kamizi
CG and VR Group.
Toyo Information Systems.Co.,Ltd.
e-mail:kamizi++at++hp99.tis.co.jp
Tel: +81-6-821-1452 Fax: +81-6-821-1989
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