Hi all,
I have currently a simple model on my scene, and I've added a light to the
scene represented by a small sphere.
I would like to fix light position and I don't want this one to move with
the model (when I move the camera), or to move it independently from the
main camera...
So I decided to add a camera and to add the light to this one, this didn't
solve the problem, both are moving togethers.
Following is the main code that creates and place objects.
I cannot use normals because I don't have geometry node.
I would appreciate some help for this easy problem!
Thanks in advance.
Jon.
{
.
//_modelGraph group represents the current scene
//_root group will contains _modelGraph plus the light
//create a group for the light
_lightGraph = new osg::Group;
.
_root->addChild(_modelGraph.get());
//create a camera to install the light
osg::ref_ptr<osg::Camera> camera = new osg::Camera;
// just inherit the main cameras view
camera->setProjectionMatrix(osg::Matrix::identity());
camera->setViewMatrix(osg::Matrix::identity());
//create the light
osg::ref_ptr<osg::Light> light = new osg::Light;
//Set options.
//create a lightsource for the light
osg::ref_ptr<osg::LightSource> lightSource = new osg::LightSource;
lightSource->setLight(light.get());
lightSource->setLocalStateSetModes(osg::StateAttribute::ON);
//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));
//Add the transform to the camera
camera->addChild(transform.get());
//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());
camera->addChild(_lightGraph.get());
// set the camera to render before the main camera (else just the
light appears on a black screen)
camera->setRenderOrder(osg::Camera::NESTED_RENDER);
_root->addChild(camera.get());
}
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