Hi dirk,
I was not aware of the Billboard class.
I tried it, it's working fine, but the "up" vector is not kept (meaning
that the text has still a rotation around the "through the screen"
axis).
And sometimes, it does not exactly face the screen.
Is that the intended behaviour ?
Stephane
>>> [EMAIL PROTECTED] 30/04/2008 15:58 >>>
Hi Stephane,
Stephane Routelous wrote:
> ok, i found a way :
>
> void display(void)
> {
> ViewportPtr vp = mgr->getWindow()->getPort(0);
> int mx = vp->getPixelWidth()/2.0;
> int my = vp->getPixelHeight()/2.0;
> Line line = mgr->calcViewRay(mx,my);
> Vec3f ld = line.getDirection();
> ld*= -1;
> Quaternion qD(Vec3f(0,0,1),ld);
>
> Vec3f up_temp;
> qD.multVec(Vec3f(0,1,0), up_temp);
>
> Quaternion qU(up_temp, mgr->getNavigator()->getUp());
>
> Quaternion qResult;
> qResult = qU;
> qResult.mult(qD);
>
> Matrix m;
>
> m.setRotate(qResult);
>
> beginEditCP(theTextTrsf);
> theTextTrsf->setMatrix(m);
> endEditCP(theTextTrsf);
>
> mgr->redraw();
> }
>
>
> and it seems to work.
>
> any comment ?
You can use a Billboard node, which will rotate to face the viewer
automatically. Billboard is a Group, so you can put whatever geometry
you want
under it.
Hope it helps
Dirk
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