Hello Ahmed,
> I need to draw a sphere inside a Transparent one.
> Can anyone tell me how to set the material and color of the Transparent one.
>
If you're using ShapeDrawables for your spheres, you can do it like this:
// Sphere of radius 1, red and semi-transparent.
osg::ref_ptr<osg::ShapeDrawable> sphere = new osg::ShapeDrawable(new
osg::Sphere(osg::Vec3(0,0,0), 1));
sphere->setColor(1, 0, 0, 0.5); // red, with 50% opacity.
sphere->getOrCreateStateSet()->setMode(GL_BLEND,
osg::StateAttribute::ON); // Activate blending.
osg::ref_ptr<osg::Geode> geode = new osg::Geode;
geode->addDrawable(sphere.get());
// Sphere of radius 0.5, blue.
osg::ref_ptr<osg::ShapeDrawable> sphere2 = new osg::ShapeDrawable(new
osg::Sphere(osg::Vec3(0,0,0), 0.5));
sphere2->setColor(0, 0, 1, 1); // blue
osg::ref_ptr<osg::Geode> geode2 = new osg::Geode;
geode2->addDrawable(sphere2.get());
osg::ref_ptr<osg::Group> root = new osg::Group;
root->addChild(geode.get());
root->addChild(geode2.get());
That should give you a semi-transparent red sphere with an opaque blue
sphere inside. (untested...)
If you're using normal geometry, you need to set a color array with the
opacity you want, and remember to enable blending on it too.
J-S
--
______________________________________________________
Jean-Sebastien Guay [EMAIL PROTECTED]
http://www.cm-labs.com/
http://whitestar02.webhop.org/
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