Thanks Vincent for your answer.
I tried to follow your suggestion, but the problem persists.
If you look at the code, I have :
|_root
---|_modelGraph
---|transform
---------|lightsource
---------|geode
Any suggestions ? What are my mistakes?
My goal is to have a model moving with the camera and a light represented by
a sphere that does not move (fixed coord).
Just one precision: when I place the light in the scene, the light
coordinates depends of the model: ((0,0,0) puts the light inside the model)
Could this explain the problem?
How can I prevent this?
Thanks again.
{
//_modelGraph group represents the current scene
//_root group will contains _modelGraph plus the light
//create the light
osg::ref_ptr<osg::Light> light = new osg::Light;
//make the light a point light by setting w to 1.0
light->setPosition(osg::Vec4(-10.0f, -10.0f, 0.0f, 10.0f));
//create a lightsource for the light
osg::ref_ptr<osg::LightSource> lightSource = new osg::LightSource;
//create a transformation node that will move the node in the scene
osg::ref_ptr<osg::MatrixTransform> transform = new osg::MatrixTransform;
transform->addChild(lightSource.get());
//Position the light
osg::Vec3 pos(-5.0f, 10.0f, 0.0f);
transform->setMatrix(osg::Matrix::translate(pos));
//create a small sphere to represent the lights position
osg::ref_ptr<osg::Geode> geode = new osg::Geode;
osg::ref_ptr<osg::TessellationHints> hints = new osg::TessellationHints;
hints->setDetailRatio(0.3);
osg::ref_ptr<osg::ShapeDrawable> shape = new osg::ShapeDrawable(new
osg::Sphere(osg::Vec3(0.0f, 0.0f, 0.0f), 0.6f), hints.get());
shape->setColor(lightColor);
geode->addDrawable(shape.get());
transform->addChild(geode.get());
_root->addChild(transform.get());
//add the model to the light's root group
_root->addChild(_modelGraph.get());
}
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