Re: Performance Problems with Billboards

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Angus Dorbie (dorbie++at++sgi.com)
Fri, 19 Feb 1999 12:00:33 -0800

What's a performance leakage?

See www.dorbie.com for an in depth discussion about this and working
Performer sample code. There's a pointer to dev toolbox on the first
page.

Cheers,Angus.

Sibylle Steck wrote:
>
> Hi pfAll,
>
> I have an application with a lot (180) of billboards. The Billboards cause a
> performance leakage. I have modeled a tree as a billboard in MultiGen. I load
> the tree and make several SCS with coordinates. I have attached my code.
>
> How can I improve my performance?
>
> Is it better for the performance to use the billboards, implemented with the
> example code libpf/C++/billboard.C?
> Is there any sample code, which use this billboards?
>
> On the very interesting billboard page from Angus Dorbie a method is described,
> which update the billboard not every frame, is there any sample code available?
>
> Thanks in advance for your help.
>
> Sibylle Steck
>
> P.S.: We have a OnyxII 3 pipe InfiniteReality2
>
> void SceneryPerformer_C::scnPlantTree(double x, double y, double alpha, int
> placeNumber)
> {
> pfMatrix mat, matT1, matT2, matR, matTmp;
> static int i = 0, j = 0;
> static int jMax;
> double beta;
> pfSCS *treeSCS;
> float treeMatrix [6][2] = {
> {40.8, 12.4}, {38.1,27.4}, {30.2,42.4},
> {19.9, 51.4}, {5.3, 45.4}, {-8.7, 39.4}};
>
> beta = alpha - 30.0;
> jMax = 3;
>
> scnRoot = pfdLoadFile("tree1.flt");
>
> for (i = 0; i<6; i++){
> for (j = 0; j<jMax; j++){
> matT1.makeTrans(treeMatrix[i][0],treeMatrix[i][1], 0);
> matR.makeRot(beta+j*120.0, 0,0,1);
> matTmp.mult(matT1, matR);
> matT2.makeTrans(x, y, -3.0);
> mat.mult(matTmp, matT2);
>
> // static coordinate system
> treeSCS= new pfSCS(mat);
> treeSCS->addChild(scnRoot);
> myScene->addChild(treeSCS);
> treeSCS->setTravMask(PFTRAV_ISECT, 1, PFTRAV_SELF, PF_SET);
> }
>
> }
> }
>
> --
> -----------------------------------------------------------
>
> _/ _/ _/_/_/ _/_/_/ Sibylle Steck
> _/_/ _/_/ _/ _/ _/ Max-Planck Institut f"ur
> _/ _/ _/ _/_/_/ _/ biologische Kybernetik
> _/ _/ _/ _/ Spemannstrasse 38
> _/ _/ _/ _/_/_/ 72076 T"ubingen, Germany
>
> phone: +49-7071-601 630
> fax : +49-7071-601 616
> web : www.kyb.tuebingen.mpg.de
> email: sibylle.steck++at++tuebingen.mpg.de
> -----------------------------------------------------------
> =======================================================================
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-- 
"Only the mediocre are always at their best." -- Jean Giraudoux


For advanced 3D graphics Performer + OpenGL based examples and tutors:
http://www.dorbie.com/

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