Igor Naigovzin wrote:
> Hello to all!
> I have a simple question.
> I want to render a two cameras (two different render surfaces) by exactly
> the same scene.
Hi Igor,
if I understand you correctly, you're doing the same sort of thing I am. I have
a few cameras rendering to the same texture.
This is the code I use:
ref_ptr<GraphicsContext::Traits> traits = new GraphicsContext::Traits;
traits->x = 500;
traits->y = 800;
traits->width = totalWidth;
traits->height = vpHeight;
traits->windowDecoration = true;
traits->doubleBuffer = true;
traits->sharedContext = 0;
ref_ptr<GraphicsContext> _gc =
GraphicsContext::createGraphicsContext(traits.get());
osgViewer::Viewer _viewer;
for (int i = 0; i < _numCameras; ++i) {
rot.makeRotate(_startAng + (_angStep * i), 0.0, 1.0, 0.0);
ref_ptr<Camera> cam = new Camera;
cam->setViewport(new Viewport(_cameraWidth * i, 0.0, _cameraWidth,
_totalHeight));
cam->setRenderOrder(osg::Camera::PRE_RENDER);
cam->setGraphicsContext(_gc);
cam->setAllowEventFocus(false);
cam->setRenderTargetImplementation(Camera::FRAME_BUFFER_OBJECT);
cam->attach(Camera::COLOR_BUFFER, _texture.get());
cam->setDataVariance(Object::DYNAMIC);
cam->addChild(group.get());
_viewer.addSlave(cam.get(), Matrixd(), rot, false);
}
_viewer.getCamera()->setProjectionMatrixAsPerspective(_cameraFoVX /
_aspectRatio, _aspectRatio, 1.0, 1000.0);
_viewer.getCamera()->setViewMatrix(trans);
_viewer.getCamera()->setClearMask(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
_viewer.getCamera()->setClearColor(Vec4(FLT_MAX, FLT_MAX, FLT_MAX, FLT_MAX));
_viewer.setDataVariance(Object::DYNAMIC);
I'm using a floating-point texture, but it works just as well with a regular
8-bit RGB texture. Note I'm setting up the viewports for each camera. My
application is a piecewise linear approximation of a cylindrical projection.
I then set up another viewer and another scene graph to render the textured
quad to the screen, then call _both_ viewers in my render loop.
Hope this helps,
-J
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