[osg-users] OSG and OpenGL rendering

[Vican, Justin E.]

Hi Roman,
In order to draw OpenGL code in the scene graph, you need to derive a
class from the osg::Drawable class.  Overload the
osg::Drawable::drawImplementation method and have it call the
VolumeClouds::Render method.  You'll have to add any instance of this
class to an osg::Geode and insert that geode into the scene graph.  

To execute the VolumeClouds::Update call at the correct time during
traversal, you'll have to add an osg::NodeCallback to the geode or an
osg::Drawable::UpdateCallback to the drawable.  In either case, you'll
probably have to derive from the callback class and overload a method to
make the call to VolumeClouds::Update.

Hope this helps,
Justin

-----Original Message-----
From: osg-users-bounces at lists.openscenegraph.org
[mailto:osg-users-bounces at lists.openscenegraph.org] On Behalf Of Roman
Grigoriev
Sent: Monday, December 03, 2007 9:12 AM
To: OpenSceneGraph Users
Subject: [osg-users] OSG and OpenGL rendering

Hi guys!
I try to implement Mark Harris cool clouds in osg but nowI try to use
his 
code that he wrote on pure GL.
all functions worked but I haven't seen clouds in window. As you see
clouds 
are not connected to root node
but I don't know how to use it. Please help me.

here is my code:
in main()
osg::ref_ptr<osg::GraphicsContext::Traits> traits = new 
osg::GraphicsContext::Traits;

traits->x = 0;

traits->y = 0;

traits->width = 1280;

traits->height = 1024;

traits->windowDecoration = false;

traits->doubleBuffer = true;

traits->sharedContext = 0;

traits->sampleBuffers = true;

traits->samples=8;

osg::ref_ptr<osg::GraphicsContext> gc = 
osg::GraphicsContext::createGraphicsContext(traits.get());

camera.get()->setGraphicsContext(gc.get());

camera.get()->setViewport(new osg::Viewport(0,0, traits->width, 
traits->height));

GLenum buffer = traits->doubleBuffer ? GL_BACK : GL_FRONT;

camera.get()->setDrawBuffer(buffer);

camera.get()->setReadBuffer(buffer);




viewer.addSlave(camera.get(), true);

root = new osg::Group();

viewer.setSceneData(root);

if (VolumeClouds.Create(30, CloudPlaneSize / 2, CloudPlaneHeight))
return 1;

Vector3 sunvector,cameraposition;

sunvector.x=1;

sunvector.y=0;

sunvector.z=0;

cameraposition.x=0;

cameraposition.y=0;

cameraposition.z=0;

while(!viewer.done())

{

VolumeClouds.Update(sunvector * SkyRadius, cameraposition);

VolumeClouds.Render(cameraposition, sunvector * SkyRadius);

 viewer.frame();

}




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