OGRE applications can be built in various IDEs. I went on with my friend these days- QtCreator. In order to be able to see OGRE working on my system, I made an application with pre-constructed code. You can follow the instructions below:
- Just download the file at this link and un-tar it. This download contains a tutorial, a dist directory and a cmake script.
- Put the files in a directory, say ogre-demo.
- Now open QtCreator and open the CMakeLists.txt file here.
- A dialog box will ask you to choose a build directory. By default, a new build directory is created. Just click next.
- Now, you will be asked to run cmake. Click the “Run Cmake” button.
- After this, open terminal and move to the build directory.
make && make installthere. If you do not run these, the console below in QtCreator would display an exit message.
- Now, you can run the app in QtCreator. You will be having a blank black screen in front of you just like the one below, though the app has compiled and is running decently.
Time to add something to see OGRE in action. 😀 I told about tutorial framework in the download done in step 1. Remember? Hm! Counting on the files in it, the entity that would be displayed in the OGRE window on running the app is defined in the file TutorialApplication.cpp. Open the file and you will find the function
createScene() is empty.
Make your function look like:
// Set the scene's ambient light
mSceneMgr->setAmbientLight(Ogre::ColourValue(0.5f, 0.5f, 0.5f));
// Create an Entity
Ogre::Entity* ogreHead = mSceneMgr->createEntity(“Head”, “ogrehead.mesh”);
// Create a SceneNode and attach the Entity to it
Ogre::SceneNode* headNode = mSceneMgr->getRootSceneNode()->createChildSceneNode(“HeadNode”);
// Create a Light and set its position
Ogre::Light* light = mSceneMgr->createLight(“MainLight”);
light->setPosition(20.0f, 80.0f, 50.0f);
Scrutinizing the code above, you will find entity Head whose source file is ogrehead.mesh. This file is present in the dist folder we got during the download, more specifically in dist/media/models folder.
Save your file and run the app. And you get this output:
Once the program is working, use the WASD keys to move, and the mouse to look around. The Escape key exits the program.
You got a basic OGRE app working with QtCreator on your system.
Well, I did not go with literal meaning of OGRE this time. 😛 You know what it is? The word “ogre” is of French origin and is used to depict a large, hideous, manlike monster that eats human beings. Ogres frequently feature in mythology, folklore, and fiction throughout the world. The above output illustrates it well! 😀