Thanks, I it works.
I add the sentence as follows,
anotherLight->setStateSetModes(*rootStateSet,osg::StateAttribute::ON);
But I don't know why it should be added?
----- Original Message -----
From: "Robert Osfield" <[EMAIL PROTECTED]>
To: "osg users" <[email protected]>
Sent: Tuesday, July 11, 2006 9:34 PM
Subject: Re: [osg-users] Multiple light problem
> Hi Yigang,
>
> At a guess I would say that you need to enable the second light for
> the subraph you want to illuminate in addition to adding the light to
> the scene. See the osglight example.
>
> Robert.
>
> On 7/11/06, Yigang Wang <[EMAIL PROTECTED]> wrote:
>> Hi, All,
>>
>> When I use multiple lights, the program is the attachment. Though I set two
>> lights in the scene, but one light brighten objects. So what is the problem?
>>
>> Thanks for your reply.
>>
>> PS. the program is as follows.
>>
>> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
>>
>> _scene = new osg::Group;
>>
>> osg::ref_ptr<osg::LightSource> oneLight = new osg::LightSource;
>>
>> osg::ref_ptr<osg::Light> light = new osg::Light;
>> light->setLightNum(0);
>>
>> osg::Vec4 ambient(0.1f,0.1f,0.1f,1.0f);
>> osg::Vec4 specular(0.5f,0.5f,0.5f,1.0f);
>> float shineness = 30;
>>
>>
>> light->setAmbient(ambient);
>> light->setSpecular(specular);
>> //light->setSpotExponent(shineness);
>> light->setPosition(osg::Vec4(0.0,0.0,2000.0,1.0f));
>>
>> light->setDiffuse(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
>> light->setConstantAttenuation(1.0f);
>>
>> oneLight->setLight(light.get());
>>
>> //_scene->setReferenceFrame(osg::LightSource::ABSOLUTE_RF); // headlight.
>> oneLight->setReferenceFrame(osg::LightSource::RELATIVE_RF); // sun
>> oneLight->setLocalStateSetModes(osg::StateAttribute::ON);
>>
>> // add either a headlight or sun light to the scene.
>> osg::ref_ptr< osg::LightSource> anotherLight = new osg::LightSource;
>> osg::ref_ptr<osg::Light> light1 = new osg::Light;
>> light1->setLightNum(1);
>> light1->setAmbient(ambient);
>> light1->setSpecular(specular);
>> //light->setSpotExponent(shineness);
>> light1->setPosition(osg::Vec4(0.0,0.0,1.0, 0.0));
>>
>> light1->setDiffuse(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
>> light1->setConstantAttenuation(1.0f);
>>
>> anotherLight->setLight(light1.get());
>>
>>
>> anotherLight->setReferenceFrame(osg::LightSource::ABSOLUTE_RF);
>> anotherLight->setLocalStateSetModes(osg::StateAttribute::ON);
>>
>> _scene->addChild( oneLight.get());
>> _scene->addChild( anotherLight.get());
>> _______________________________________________
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>> http://www.openscenegraph.org/
>>
>>
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