学步园

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