Re: [osg-users] Transparency on a drawable

[Brian R Hill]

This is what I do:

osg::StateSet * stateset = node->getOrCreateStateSet();
osg::Material * mm = dynamic_cast<osg::Material*>(stateset->getAttribute
(osg::StateAttribute::MATERIAL));
if (!mm)
{
 mm = new osg::Material;
}
mm->setAlpha(osg::Material::FRONT, transparency);
stateset->setAttributeAndModes( mm, osg::StateAttribute::OVERRIDE |
osg::StateAttribute::ON);
stateset->setMode(GL_BLEND,   osg::StateAttribute::OVERRIDE |
osg::StateAttribute::ON );
stateset->setMode(GL_LIGHTING,osg::StateAttribute::OVERRIDE |
osg::StateAttribute::ON );
stateset->setRenderingHint(osg::StateSet::TRANSPARENT_BIN);

Brian
[EMAIL PROTECTED] wrote: -----


To: "'OpenSceneGraph Users'" <osg-users@lists.openscenegraph.org>
From: "Gordon Tomlinson" <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
Date: 07/11/2008 09:59AM
Subject: Re: [osg-users] Transparency on a drawable


Vincent
You post your initial question at a little over 2 hours ago.. you need to
give people time to possibly respond maybe 1-2 days
http://www.catb.org/~esr/faqs/smart-questions.html
also a search of the mailing list archive will throw up quite a few
discussions and solutions on this very subject




From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Vincent
Bourdier
Sent: Friday, July 11, 2008 8:54 AM
To: osg
Subject: Re: [osg-users] Transparency on a drawable


No one have any idea of how to set an alpha transparency level on a
geometry ?
It has no texture, juste one color...

Thanks,

Regards,

Vincent.


2008/7/11 Vincent Bourdier < [EMAIL PROTECTED] >:

Hi All,

Just a simple question on how to set a transparency effect on a drawable.

My geode contains 2 drawables, and I need only one to be transparent...

I've tried :


double opacity = 0.1;

    osg::StateSet* state = mygometry->getOrCreateStateSet();
    state->setMode(GL_BLEND,osg::StateAttribute::ON|
    osg::StateAttribute::OVERRIDE);
    osg::Material* mat = (osg::Material*)state->getAttribute
    (osg::StateAttribute::MATERIAL);
    if(!mat) {
        mat = new osg::Material;
        mat->setAlpha(osg::Material::FRONT_AND_BACK, opacity);
        state->setAttributeAndModes(mat,osg::StateAttribute::ON);
    }


Lightning is already set to ON...

But nothing appear transparent...

Thanks,

Regards
    Vincent.


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