学步园

/*-----------------------------------------------------------<br /> * Using the offscreen renderer to generate a texture map.<br /> * Generate simple scene and grab the image to use as<br /> * a texture map.<br /> *----------------------------------------------------------*/<br /> #include <Inventor/SoDB.h><br /> #include <Inventor/SoInput.h><br /> #include <Inventor/SoOffscreenRenderer.h><br /> #include <Inventor/SbViewportRegion.h><br /> #include <Inventor/nodes/SoCube.h><br /> #include <Inventor/nodes/SoDirectionalLight.h><br /> #include <Inventor/nodes/SoPerspectiveCamera.h><br /> #include <Inventor/nodes/SoRotationXYZ.h><br /> #include <Inventor/nodes/SoSeparator.h><br /> #include <Inventor/nodes/SoTexture2.h><br /> #include <Inventor/Win/SoWin.h><br /> #include <Inventor/Win/viewers/SoWinExaminerViewer.h><br /> SbBool<br /> generateTextureMap(SoNode *root, SoTexture2 *texture,<br /> short textureWidth, short textureHeight)<br /> {<br /> SbViewportRegion myViewport(textureWidth, textureHeight);</p> <p> // Render the scene<br /> SoOffscreenRenderer *myRenderer =<br /> new SoOffscreenRenderer(myViewport);<br /> myRenderer->setBackgroundColor(SbColor(0.3f, 0.3f, 0.3f));<br /> if (!myRenderer->render(root)) {<br /> delete myRenderer;<br /> return FALSE;<br /> }</p> <p> // Generate the texture<br /> texture->image.setValue(SbVec2s(textureWidth, textureHeight),<br /> SoOffscreenRenderer::RGB, myRenderer->getBuffer());</p> <p> delete myRenderer;<br /> return TRUE;<br /> }<br /> #include <Inventor/nodes/SoComplexity.h><br /> int<br /> main(int, char **argv)<br /> {<br /> // Initialize Inventor and Win<br /> HWND appWindow = SoWin::init(argv[0]);<br /> if (appWindow == NULL)<br /> exit(1);</p> <p> // Make a scene from reading in a file<br /> SoSeparator *texRoot = new SoSeparator;</p> <p> SoComplexity *nodeComplexity = new SoComplexity;<br /> nodeComplexity->ref();<br /> nodeComplexity->textureQuality = 0.0f;<br /> texRoot->addChild(nodeComplexity);</p> <p> SoInput in;<br /> SoNode *result;</p> <p> texRoot->ref();<br /> in.openFile("../data/jumpyMan.iv");<br /> SoDB::read(&in, result);</p> <p> SoPerspectiveCamera *myCamera = new SoPerspectiveCamera;<br /> SoRotationXYZ *rot = new SoRotationXYZ;<br /> rot->axis = SoRotationXYZ::X;<br /> rot->angle = (float)M_PI_2;<br /> myCamera->position.setValue(SbVec3f(-0.2f, -0.2f, 2.0f));<br /> myCamera->scaleHeight(0.4f);<br /> texRoot->addChild(myCamera);<br /> texRoot->addChild(new SoDirectionalLight);<br /> texRoot->addChild(rot);<br /> texRoot->addChild(result);</p> <p> // Generate the texture map<br /> SoTexture2 *texture = new SoTexture2;<br /> texture->ref();<br /> if (generateTextureMap(texRoot, texture, 64, 64))<br /> printf ("Successfully generated texture map/n");<br /> else<br /> printf ("Could not generate texture map/n");<br /> texRoot->unref();</p> <p> // Make a scene with a cube and apply the texture to it<br /> SoSeparator *root = new SoSeparator;<br /> root->ref();<br /> root->addChild(texture);<br /> root->addChild(new SoCube);</p> <p> // Initialize an Examiner Viewer<br /> SoWinExaminerViewer *viewer =<br /> new SoWinExaminerViewer(appWindow);<br /> viewer->setSceneGraph(root);<br /> viewer->setTitle("Offscreen Rendered Texture");</p> <p> // In Inventor 2.1, if the machine does not have hardware texture<br /> // mapping, we must override the default drawStyle to display textures.<br /> viewer->setDrawStyle(SoWinViewer::STILL, SoWinViewer::VIEW_AS_IS);</p> <p> viewer->show();</p> <p> SoWin::show(appWindow);<br /> SoWin::mainLoop();<br /> return 0;<br /> }<br />