Hi,
I'm implementing the IDBuffer technique for rectangle selection of
visible objects.
I have a problem with Z Sorting of the bufffer grabbed from my
PassiveWindow
see screenshots :
http://www.exotk.org/OpenSG/mainview.png
http://www.exotk.org/OpenSG/idbuffer.png
even if I use occlusion for the main view and the idbuffer view, it
does not work (in my main view, I don't use occlusion culling)
any idea ?
thanks a lot,
Stephane
the window is created with :
_hwnd = CreateWindow("STATIC","", WS_OVERLAPPEDWINDOW,0, 0, _w,
_h, HWND_DESKTOP, 0, GetModuleHandle(NULL), NULL);
the pfd is
PIXELFORMATDESCRIPTOR pfd;
memset(&pfd, 0, sizeof(pfd));
pfd.nSize = sizeof(pfd);
pfd.nVersion = 1;
pfd.dwFlags =
PFD_DRAW_TO_WINDOW |
PFD_SUPPORT_OPENGL |
PFD_DOUBLEBUFFER;
pfd.iPixelType = PFD_TYPE_RGBA;
pfd.iLayerType = PFD_MAIN_PLANE;
pfd.cDepthBits = 16;
the "grab" code is :
void init()
{
OSG::SolidBackgroundPtr _solidBkg =
OSG::SolidBackground::create();
beginEditCP(_solidBkg);
_solidBkg->setColor(OSG::Color3f(0,0,0));
endEditCP(_solidBkg);
_ID_viewport = OSG::Viewport::create();
beginEditCP(_ID_viewport);
_ID_viewport->setBackground(_solidBkg);
_ID_viewport->setSize(0,0,1,1);
endEditCP(_ID_viewport);
_window = OSG::PassiveWindow::create();
_window->init();
_window->deactivate();
_window->addPort(_ID_viewport);
_ID_renderAction = OSG::RenderAction::create();
_ID_renderAction->setAutoFrustum(true);
}
void grab()
{
if ( _hwnd )
{
RECT r;
GetWindowRect(_hwnd,&r);
if ( abs(r.top - r.bottom) != _h || abs(r.right -
r.left) != _w )
{
SetWindowPos(_hwnd, NULL, 0, 0, _w, _h,
SWP_NOMOVE | SWP_NOZORDER | SWP_NOACTIVATE);
}
}
else
{
if ( !_CreateWindow() )
return;
}
_window->activate();
wglMakeCurrent(_hdc,_hGLContext);
// Setup the GrabForeground
_grabber = OSG::GrabForeground::create();
beginEditCP(_grabber);
OSG::ImagePtr img = OSG::Image::create();
beginEditCP(img);
img->set(GL_RGBA,_w,_h);
endEditCP(img);
_grabber->setImage(img);
_grabber->setAutoResize(false);
_grabber->setActive(false);
endEditCP(_grabber);
// Putting it to the viewport
_window->getPort(0)->getMFForegrounds()->push_back(_grabber);
// We toggle the switch material so as to render identification
colors.
switchToIDBuffer();
beginEditCP(_grabber);
_grabber->setActive(true);
endEditCP(_grabber);
// We render to the grabber
_window->render(_ID_renderAction);
glFlush();
SwapBuffers(_hdc);
beginEditCP(_grabber);
_grabber->setActive(false);
endEditCP(_grabber);
// We get the data back
if(_grabber->getImage()->getData() != NULL)
{
//#ifdef _DEBUG
_grabber->getImage()->write("C:\\idbuffer.png");
//#endif
_ID_buffer = _grabber->getImage()->getData();
}
// We toggle to standard materials
switchToNormal();
// we remove the Grabber
OSG::MFForegroundPtr::iterator i
=_window->getPort(0)->getMFForegrounds()->find(_grabber);
if( i != _window->getPort(0)->getMFForegrounds()->end() ){
_window->getPort(0)->getMFForegrounds()->erase(i);
}
wglMakeCurrent(NULL,NULL);
_window->deactivate();
}
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