[osg-users] Load an obj file and mapping a given vertex to its Texture coordinates

[michael kapelko]

Here's how I change texture coordinates:
https://github.com/OGStudio/ogs-mahjong-components/blob/0308cd2ed97b001cf5aecea1b5aada839707c5cf/02.Theme/desktop/src/render.h#L184
Note that the function gets osg::Geode that has already been extracted
from osg::Node.

Here's a sample class to print whole osg::Node structure (replace
log::logprintf with printf):
https://github.com/OGStudio/openscenegraph-cross-platform-examples/blob/f692fd8b0886dbdba1d4e99087998e87827056db/features/scene/PrintGraphVisitor.cpp
You need to create this class instance and call
'yourNode.accept(instance);' to have the structure printed.
On Wed, 8 Aug 2018 at 15:43, Werner Modenbach
<Werner.Modenbach at texion.eu> wrote:
>
> Hi Mike,
>
> the loaded node isn't just a single node but a treelike structure where
> your actual geode(s) is/are located somewhere in the structure.
> What you mean by vertex Id? Each geode contains 1 or more drawables and
> each drawable contains a vertex array and eventually texCoordArray(s).
>
> So you have to identify the geode your vertex is in. Then you can try to
> dynamic_cast. Anyway you need to check if your cast returned 0.
>
> The next problem is the osg::Array. I didn't find a solution for that so
> far. If you kno
>
> Am 06.08.2018 um 16:27 schrieb Mike Blakefiled:
> > Hi everyone, I'm new here.
> >
> > I load an obj file with osgDB::readNodeFile("my.obj") and add it to my scene.
> > now, given a vertex Id, I'd like to be able to get its UV/Texture coordinate.
> >
> > I can see that osg::Geometry has a getTexCoordArray() method, but dynamically casting my node to org::Geometry crashes the program.
> > moreover, according to the docs,  getTexCoordArray() simply returns a pointer to osg::Array, and it's unclear what type the elements of that array is (osg::Vec2?)
> > ...
> >
> > Thank you!
> >
> > Cheers,
> > mike
> >
> > ------------------
> > Read this topic online here:
> > http://forum.openscenegraph.org/viewtopic.php?p=74473#74473
> >
> >
> >
> >
> >
> > _______________________________________________
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>
>
>
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