Thanks Robert. now I understand better the OSG .
2009/7/16 Robert Osfield <[email protected]> > Hi David, > > The OSG's default for model coordinates is Z up, Y to the north, X to the > east. > > While the Camera's view matrix moves from the model coordinates in eye > coordinates, and the slave view and projection matrix offsets are post > multiplied to give the final view and projection matrix for the slave > camera, so these offset matrices are in eye coordinates. > > Eye coordinates are just standard OpenGL eye coordinates, so Z is out > from the screen, Y is up the screen, and X is to the right. My guess > is that you are thinking about rotations in model coordinates rather > eye coordinates. > > Robert. > > On Thu, Jul 16, 2009 at 8:32 AM, David Tapia<[email protected]> wrote: > > Hi people, > > > > I have a scene with master camera and 4 slave cameras. > > > > I try to change the angle HPR on my slave cameras, but when that change > the > > Heading angle, which makes changing the roll, > > and when change Roll angle, what it does is change the Heading. However > the > > pitch is working well. > > > > What am I doing wrong? > > > > Example code: > > > > int main(int, char **) > > { > > osgViewer::Viewer viewer; > > viewer.setSceneData(osgDB::readNodeFile("cow.osg")); > > > > osg::GraphicsContext::WindowingSystemInterface* wsi = > > osg::GraphicsContext::getWindowingSystemInterface(); > > > > unsigned int width, height; > > wsi->getScreenResolution(osg::GraphicsContext::ScreenIdentifier(0), > > width, height); > > > > osg::ref_ptr<osg::GraphicsContext::Traits> traits = new > > osg::GraphicsContext::Traits; > > traits->x = 0; > > traits->y = 0; > > traits->width = width; > > traits->height = height; > > traits->windowDecoration = true; > > traits->doubleBuffer = true; > > traits->sharedContext = 0; > > > > osg::ref_ptr<osg::GraphicsContext> gc = > > osg::GraphicsContext::createGraphicsContext(traits.get()); > > > > unsigned int numCameras = 4; > > double aspectRatioScale = 1.0;//(double)numCameras; > > for(unsigned int i=0; i<numCameras;++i) > > { > > osg::ref_ptr<osg::Camera> camera = new osg::Camera; > > camera->setGraphicsContext(gc.get()); > > camera->setViewport(new > > osg::Viewport((i*width)/numCameras,(i*height)/numCameras, > width/numCameras, > > height/numCameras)); > > GLenum buffer = traits->doubleBuffer ? GL_BACK : GL_FRONT; > > camera->setDrawBuffer(buffer); > > camera->setReadBuffer(buffer); > > > > viewer.addSlave(camera.get(), osg::Matrixd(), osg::Matrixd()); > > } > > > > double angle(0.); > > > > osg::Matrix rot = osg::Matrix::identity(); > > > > // CHANGE HEADING > > osg::Vec3 hpr; > > hpr[0] = 10.0f; > > hpr[1] = 0.0f; > > hpr[2] = 0.0f; > > > > osg::Matrix H; > > H.makeRotate(osg::DegreesToRadians(hpr[0]), osg::Vec3(0,0,1)); // > > heading -> > > > > osg::Matrix P; > > P.makeRotate(osg::DegreesToRadians(hpr[1]), osg::Vec3(1,0,0)); // > pitch > > -> > > > > osg::Matrix R; > > R.makeRotate(osg::DegreesToRadians(hpr[2]), osg::Vec3(0,1,0)); // > roll > > -> > > > > rot = H*P*R; > > > > viewer.getSlave(0)._viewOffset = rot; > > > > // CHANGE PITCH > > hpr[0] = 0.0f; > > hpr[1] = 10.0f; > > hpr[2] = 0.0f; > > > > H = osg::Matrix::identity(); > > P = osg::Matrix::identity(); > > R = osg::Matrix::identity(); > > > > H.makeRotate(osg::DegreesToRadians(hpr[0]), osg::Vec3(0,0,1)); // > > heading -> > > > > P.makeRotate(osg::DegreesToRadians(hpr[1]), osg::Vec3(1,0,0)); // > pitch > > -> > > > > R.makeRotate(osg::DegreesToRadians(hpr[2]), osg::Vec3(0,1,0)); // > roll > > -> > > > > rot = H*P*R; > > > > viewer.getSlave(1)._viewOffset = rot; > > > > // CHANGE ROLL > > hpr[0] = 0.0f; > > hpr[1] = 0.0f; > > hpr[2] = 10.0f; > > > > H = osg::Matrix::identity(); > > P = osg::Matrix::identity(); > > R = osg::Matrix::identity(); > > > > H.makeRotate(osg::DegreesToRadians(hpr[0]), osg::Vec3(0,0,1)); // > > heading -> > > > > P.makeRotate(osg::DegreesToRadians(hpr[1]), osg::Vec3(1,0,0)); // > pitch > > -> > > > > R.makeRotate(osg::DegreesToRadians(hpr[2]), osg::Vec3(0,1,0)); // > roll > > -> > > > > rot = H*P*R; > > > > viewer.getSlave(2)._viewOffset = rot; > > > > viewer.run(); > > } > > > > -- > > DTC > > > > _______________________________________________ > > osg-users mailing list > > [email protected] > > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > -- DTC
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