Re: [Plib-users] TweenController in plib

[Steve B. <sjb...@ai...>]

Rolf Jakob wrote:

> So, you only have a ssgTweenController.

That's what ExPoser puts at the top of the scene sub-graph it
generates...so that's what you'll get back from ssgLoad.

> I tried again and removed the ssgTransform, so that I have :
> 
> ssgTweenController *femme_obj;
> femme_obj=new ssgTweenController;
> femme_obj->addKid(ssgLoadSSG("player-female_tweened.ssg"));
> scene->addKid(femme_obj);
> 
> float bank=(frameno%140)/14.0;
> femme_obj->selectBank(bank);
> cerr << femme_obj->getTypeName() << " bank : " << bank << endl;
> 
> It's an ssgTweenController now, but it won't move. *sigh*

Well, you can certainly put the ssgTweenController *under* an ssgTransform.

Your original code seemed to do that OK:

 > > ssgTransform *femme=0;
 > > ssgEntity *femme_obj;
 > >
 > > // init
 > > femme=new ssgTransform;
 > > femme_obj=ssgLoadSSG("player-female_tweened.ssg");
 > > femme->addKid(femme_obj);
 > > sgCoord fc;
 > > sgSetCoord(&fc,1.67,0.126,0,90,0,0);
 > > femme->setTransform(&fc);
 > > scene->addKid(femme);

So femme_obj is the ssgTweenController and femme is the transform.

Diagramatically, you had:


                    scene    (ssgRoot)
                      |
                    femme    (ssgTransform)
                      |
                  femme_obj  (ssgTweenController)
                      |
               ...other stuff...

...which seems OK - I don't understand how come it's not working.

> Before your reply I checked another thing: I used to have a ssgEntity casted 
> to a ssgTweenController when needed.

That's OK.

> I turned it around so that I have a 
> ssgTweenController and the result of ssgLoadSSG is casted once. That showed 
> the exact same result.

Indeed - that's what you'd expect.

>>..so I think you are basically doing the right thing - you must have
>>a bug somewhere.  I guess you should do:
>>
 >>    cerr << femme->getTypeName() << endl ;
> 
> femme is a ssgTransform, femme_obj was a ssgRoot in my first example.

Eh?  No - 'scene' is the root, femme is the transform and femme_obj is the
ssgTweenController.

Er - right.  Sorry, I meant to suggest:

     cerr << femme_obj->getTypeName() << endl ;
                  ^^^^

So we can be sure that ExPoser actually *did* write out what we expected
it to.

> With the modifications above (no ssgTransform) a femme_obj->print() reads:
> Current Bank = 0.000000
> ssgTweenController: Name=NoName
>   Userdata = (nil)
>   Num Parents=0

EH? No parents?!?  That suggests that it's not connected into the scene graph.

> Hmmm, I'm supposed to use the file exposer writes directly without any further 
> modifications, right ?

Yes - although if you had a 3D modeller (PrettyPoly for example) that understood
SSG-format files - then you *could* go and hand-edit what ExPoser generated.

> PS:  I put the current snapshot of the program and everything needed on my 
> home page, just in case somebody is interested in it and wants to take a look 
> at it. It's a beginning of a OLRPG with server and client, multiple scenes 
> and hopefully some walking characters - somewhen ;-)

Perhaps a simpler test program is needed?

----------------------------- Steve Baker -------------------------------
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