[osg-users] depth buffer to texture

[Martin Großer]

Hello all,

 

I want to render a scene to a texture. Here is my implementation of the
texture and the camera.

 

osg::Texture2D* texture = new osg::Texture2D;

texture ->setTextureSize(700, 525);

texture ->setInternalFormat(GL_RGBA);

texture ->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR);

texture ->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);

 

// create camera RenderToTexture

osg::Camera* camera = new osg::Camera;

// copy

camera->addChild(…);

camera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);

camera->setClearMask( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );

camera->setClearColor(clearColor);

camera->setViewport(0,0,700,525);

// set the camera to render befor the main camera

camera->setRenderOrder(osg::Camera::PRE_RENDER, order);

// tell the camera to use OpenGL frame buffer object where supported

camera->setRenderTargetImplementation( osg::Camera::FRAME_BUFFER_OBJECT );

// attach the texture and use it as the color buffer

camera->attach(osg::Camera::COLOR_BUFFER, texture, 0, 0);

// add camera to root

root->addChild(camera);

 

 

Now, my Problem is that I would like the render the depth buffer information
in the alpha cannel of the texture. But it doesn’t work. :-(

All pixel of the alpha cannel are white??!!

 

Can everybody help me?

 

Cheers,

 

Martin


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