[osg-users] PolytopeIntersector with AutoTransform

[Bruno Oliveira]

Thanks for the answer.
How could I solve this?

2016-12-04 12:47 GMT+00:00 Robert Osfield <robert.osfield at gmail.com>:

> Hi Bruno,
>
> The complication with AutoTransform is the it computes it's values
> only in the CullVisitor so you'll inherit what ever the last frame
> used for it's settings.  This should work OK most of the time. If you
> have multiple views on the scene this will mean that there are
> multiple stats but only the last one will be left in place for the
> next frame.
>
> Robert.
>
>
>
> On 3 December 2016 at 17:55, Bruno Oliveira
> <bruno.manata.oliveira at gmail.com> wrote:
> > Hello,
> >
> > in my scene graph I'm using an AutoTransform to add a circle with
> Radius=10,
> > centered on (0,0,0):
> >
> >   float Radius = 10;
> >   for (int i = 0; i < nPointsInCircle; i++)
> >     vertArray[i] = Vec3d( radius * sin(...), radius* cos(...), 0.));
> >
> > then I add this to a Drawable + Geode, and add that Geode to an
> > AutoTransform:
> >
> >   auto* autoTransform = new osg::AutoTransform;
> >   autoTransform->addChild(circleGeode);
> >   autoTransform->setAutoScaleToScreen(true);
> >   autoTransform->setPosition(100, 100, 0);
> >
> > This results in a circle located in (100, 100, 0), with radius 10,
> scaling
> > automatically to screen. VISUALLY this is what I want.
> > Now when I use a PolytopeIntersector on this node, it returns
> intersection
> > coordinates of the circle , in the Circle's geometry frame, centered in
> > (0,0,0) with radius 10. This means that, if I hover my mouse over the
> > Circle, which is located in world coordinates in (100, 100, 0), the
> > PolytopeIntersector returns coordinates centered in (0,0,0) with maximum
> > radius 10.
> >
> >
> > How can I obtain true world coordinates with Autotransforms?
> >
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> >
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