SoInput, SoOutput, SoWriteAction, SoSearchAction使用

/*------------------------------------------------------------ * Search Action example. * Read in a scene from a file. * Search through the scene looking for a light. * If none exists, add a directional light to the scene * and print out the modified scene. *-----------------------------------------------------------*/#include <Inventor/SoDB.h>#include <Inventor/actions/SoSearchAction.h>#include <Inventor/actions/SoWriteAction.h>#include <Inventor/nodes/SoDirectionalLight.h>#include <Inventor/nodes/SoSeparator.h>intmain(int, char **){ // Initialize Inventor SoDB::init();#ifdef WIN32 SoOutput conOut; conOut.setFilePointer(__AllocConsole());#endif // Open and read input scene graph SoInput sceneInput; if (! sceneInput.openFile("../data/bird.iv")) return 1; SoSeparator *root = SoDB::readAll(&sceneInput); if (root == NULL) return 1; root->ref(); ////////////////////////////////////////////////////////////// // CODE FOR The Inventor Mentor STARTS HERE SoSearchAction mySearchAction; // Look for first existing light derived from class SoLight mySearchAction.setType(SoLight::getClassTypeId()); mySearchAction.setInterest(SoSearchAction::FIRST); mySearchAction.apply(root); if (mySearchAction.getPath() == NULL) { // No lights found // Add a default directional light to the scene SoDirectionalLight *myLight = new SoDirectionalLight; root->insertChild(myLight, 0); } // CODE FOR The Inventor Mentor ENDS HERE ////////////////////////////////////////////////////////////// #ifdef WIN32 SoWriteAction myWriteAction(&conOut);#else SoWriteAction myWriteAction;#endif myWriteAction.apply(root); // #ifdef WIN32// conOut.flushFile();// #endif root->unref(); // The usual exit(0) has been replaced with exit(1) to enable the console // window showing the output to stay on the screen until the user deletes it exit(1); return 0;}