Re: Can I specify drawing order?

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Lawrence Bertoldi (lberto++at++sgi.com)
Fri, 23 Apr 1999 16:51:15 -0400

since your using C++ you should look at the man page for
pfChannel and pfGeoSet and not get wrapped up in the
c/c++ syntax differences.

Most of what you need is in here.

Try this

// Turn off bin ordering for OPAQUE and TRANSP bins
// (these are the default bins)

chan->setBinOrder(PFSORT_OPAQUE_BIN,-1);
chan->setBinOrder(PFSORT_TRANSP_BIN,-1);

turn off binsorting within the bins

chan->setBinSort(PFSORT_TRANSP_BIN, PFSORT_NO_SORT, NULL);
chan->setBinSort(PFSORT_OPAQUE_BIN, PFSORT_NO_SORT, NULL);

//First Create the objects....

pfGeode *geode[3];
for(int i = 0; i < 3; i++)
{
     geode[i] = new pfGeode;
     geode[i]->ref();
}

//Load them into the scene graph the way you want them to be drawn
//This way the objects get sorted by there position in the scene graph.

scene->addChild(geode[2]);
scene->addChild(geode[1]);
scene->addChild(geode[0]);

//to change the sorting order,

scene->removeChild(geode[0]);
scene->insertChild(index,geode[0]);

I just happen to have done something vary much like this
within the last month.

-- 
See Ya,


Lawrence Eugene Bertoldi		Technical Consultant
vnet 	238-8949			Silicon Graphics 
phone 	301-572-8949			Silver Spring MD.
email	lberto++at++clubfed.sgi.com


~;-}>




Gordon Tomlinson wrote:
> 
> Hi
> 
> To control the Draw order you need to use
> 
> pfDrawBins, you create these for your channels
> then tell you pfGeoSets which bin they belong in
> and you can sort these bins etc
> 
> Have a look at
> 
>         pfGetChanFreeBin(pfChannel* chan)
>         pfChanBinSort(pfChannel *chan, int bin, int sortType,int *sortOrders);
>         pfChanBinOrder(pfChannel *chan, int bin, int order);
>         pfDrawBin(int bin);
> 
>         pfGSetDrawBin(pfGeoSet *gset, short bin);
>         pfGSetDrawOrder(pfGeoSet * gset, unsigned int order);
> 
> These should point you in the right direction
> 
> Gordon.
> 
> > Choi, Changrak wrote:
> >
> 
> > Dear performers.
> >
> > I want to specify drawing order at pf level.
> > For example,
> > I make 3 geodes and attach them to scene graph.
> >
> > pfGeode *geode[3];
> > pfScene *scene = new pfScene;
> >
> > for(int i = 0; i < 3; i++)
> > {
> >     geode[i] = new pfGeode;
> >     .... // add GSet etc
> >     scene->addChild(geode[i]);
> > }
> >
> > In this case, all geode drawing orders depend on distances from eye point to geodes' bounding box.
> > When I want that always geode[0] draws last time, how can I program?
> >
> > Sorry to short English,
> >
> > Thanks..
> >
> > -----------------------------------------------------
> > 최창락 (Choi, Changrak)
> > http://galaxy.channeli.net/maitte/
> > 서울시 영등포구 여의도동 18 한국방송공사
> 
> --
> 
> Regards
> 
> Gordon.
> 
> Gordon Tomlinson              | Multigen - Paradigm  Inc
> Vega Software Engineer        | Suite 400, 14900 Landmark Blvd
> Email: gordon++at++paradigmsim.com | Dallas, Texas 75240, USA
> Tel:    972 960 2301          | Fax:    972 960 2303
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