[Opensg-users] FBO render to depth image (OpenSG 2.0)

[Christoph F. <c.f...@gm...>]

Hi all,

I would like to render a depth image via FBO with a
current OpenSG 2.0.
Quite a common operation, so can someone post a code fragment for it perhaps?

I have tried the code below so far without success.
Getting the color image works without any problems ..

void computeHeightfieldImage (OSG::Node* root, 
			      OSG::UInt32 x, OSG::UInt32 y,
			      OSG::NodeUnrecPtr& stageN,
			      OSG::ImageRefPtr&  image)
{
   // create FBO
   image = OSG::Image::create();
   image->set(OSG::Image::OSG_L_PF, 
	      x, y, 1, 1, 1,
     	      0.0,
     	      0,
     	      OSG::Image::OSG_FLOAT32_IMAGEDATA);

   OSG::FrameBufferObjectRefPtr fbo = OSG::FrameBufferObject::create();
   OSG::RenderBufferRefPtr     depthBuf  = OSG::RenderBuffer::create(); 
   depthBuf->setImage(image);
   depthBuf->setInternalFormat(GL_DEPTH_COMPONENT32);    
   OSG::RenderBufferRefPtr     texBuf = OSG::RenderBuffer::create();
   texBuf  ->setInternalFormat(GL_RGB);    
   // make the fbo render to the texture
   fbo->setColorAttachment(texBuf, 0);
   fbo->setDepthAttachment(depthBuf );
   fbo->editMFDrawBuffers()->push_back(GL_COLOR_ATTACHMENT0_EXT);
   fbo->setWidth (x);
   fbo->setHeight(y);
   depthBuf->setReadBack          (true);
   fbo->setPostProcessOnDeactivate(true);
..
}

Thanks,
Christoph 
-- 
Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir
belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de