Hello forum,
I am trying to render the whole scene in a texture and then i shall send the
texture through a fragment program for post processing and then render this
texture
in a screen aligned quad. In some previous posts Robert suggested to look
into the osgdistortion program, and now i am trying to render the initial
scene(the animated one) to a texture and again render that scene to the
texture aligned quad without any shader pass through. I did some minor
changes in the osgdistortion example, but i am getting a blank screen. The
changes that i have done are as follows:
inside the createDistortedSubGraph(osg::Node *node, osg::Camera *cam) i am
doing the following:
**************************************************'
1. Create a group node - distortionNode.
2. Get the viewport from the camera.
3. Get the width and height from the viewport.
4. Define a 2D texture with the width and height that i got. Textures's
other parameters are just the same as provided in the osgdistortion.
5. Then i define the camera to render to the texture.
5.1. camera->setReferenceFrame(osg::Transform::RELATIVE_RF);
5.2. Set the projection and view matrix to identity matrix.
5.3. Set the viewport of the camera with the width and height.
5.4. camera->setRenderOrder(osg::Camera::PRE_RENDER);
5.5.
camera->setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT);
5.6. camera->attach(osg::Camera::COLOR_BUFFER_BIT,texture.get());
5.7. camera->addChild(node);
5.8. distortionNode->addChild(camera.get());
//then create the HUD camera
6. Create a geometry.
7. Define the primitive set to be a QUAD.
8. Define the vertex array.
8.1 Vertex array contain the following values. (I think this where i did
something wrong)
8.1.1.
vertices->push_back(0,0,0); vertices->push_back(width,0,0);
vertices->push_back(width,0,height);vertices->push_back(0,0,height);
9 Define the texture array.
9.1 Texture array contain the following values:
9.1.1.
texcoords->push_back(osg::Vec2(0,0));
texcoords->push_back(osg::Vec2(width,0));
texcoords->push_back(osg::Vec2(width,height));
texcoords->push_back(osg::Vec2(0,height));
10. Create the geode and add all the geometry
************************************************'**
The rest is same as in oggdistortion. Any hint would be very helpful.
Regards
Sajjad
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