[osg-users] shape, shape drawable and geode modification

[Miguel Lokida]

Hi,

Here 's my problem. I have a cylinder shape that I have added to my scenegraph. here a sample code:

I have declared instances in the headers. And I can display the cylinder.

Code:

rp_cylinder = new osg::Cylinder();

rp_cylinder->setHeight(1.0f);
rp_cylinder->setRadius(100.0f);
rp_cylinder->setRotation(osg::Quat( (M_PI / 2.0f),osg::Vec3(0.0f, 1.0f, 0.0f)) );

rp_CylinderDrawable = new osg::ShapeDrawable(rp_cylinder.get());

rp_cylinderGeode = new osg::Geode();

rp_cylinderGeode->addDrawable(rp_CylinderDrawableDebFen.get());

rp_position->addChild(rp_cylinderGeode.get());

But, I would like to modify the radius and height of the cylinder. So, I do:

Code:
osg::Cylinder * cylinder = static_cast<osg::Cylinder *>(rp_cylinderGeode->getDrawable(0)->getShape());
cylinder->setHeight(2.0f);

But the problem is that nothing happen. No modification of the geometry.
The address of the pointer is always the same so it is the same object.

What 's wrong with my implementation ?

Thank you![/code]

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Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=17347#17347

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[Robert Osfield]

Hi Miguel,

By default the OSG creates display lists for drawables, including the ShapeDrawable, and this won't automatically update unless you tell the drawable it needs to recompile the display list which you can do via drawable->dirtyDisplayList().  If you plan to modify the shape regularily then it's best to just disable display lists outright via drawable->setUseDisplayList(false) as the compilation is relatively expensive.

Robert.

[Miguel Lokida]

Thanks a lot. That works !

------------------
Read this topic online here:

http://forum.openscenegraph.org/viewtopic.php?p=17371#17371