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| public:t-gede-13-1:lab2 [2013/01/22 12:52] – [Lab Project] hannes | public:t-gede-13-1:lab2 [2024/04/29 13:33] (current) – external edit 127.0.0.1 |
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| Follow these steps to complete the lab project: | Follow these steps to complete the lab project: |
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| - **Create a New Project** Create a new empty project called "Lab2" in the same solution as the previous lab project and copy your source files over there (make sure you copy them in the file system and don't just drag them around in the solutions browser, because by default the browser creates a symbolic link to the original file instead of copying). Rename source files as necessary. Unfortunately you'll have to review the configuration properties again for this project (see the instructions for [[Lab1]]), it is quite silly that those can't easily be copied between projects. After this step is done, you should have a new project that compiles and runs (and does the same thing as the previous lab). | - **Create a New Project** Create a new empty project called "Lab2" in the same solution as the previous lab project and copy your source files over there (make sure you copy them in the file system and don't just drag them around in the solutions browser, because by default the browser creates a symbolic link to the original file instead of copying). Rename source files as necessary. Unfortunately you'll have to review the configuration properties again for this project (see the instructions for [[Lab1]]), it is quite silly that those can't easily be copied between projects. After this step is done, you should have a new project that compiles and runs (and does the same thing as the previous lab). **Make this new project the ACTIVE PROJECT my right clicking on it in the solutions browser and selecting Set as StartUp Project** |
| - **Attach an Object to the Ogre** You should create a new movable entity that will be attached to the Ogre entity (from Lab1) wherever it goes. Essentially this new entity, that we will call "The Cube", will exist in the coordinate system of the Ogre model. To do this, you need to create a new ''SceneNode'' as a child of the Ogre's scene node, and attach the Cube to that node. This means that all transformations applied to the Ogre's scene node will be passed down into the Cube's scene node as well. So, do the following: | - **Attach an Object to the Ogre** You should create a new movable entity that will be attached to the Ogre entity (from Lab1) wherever it goes. Essentially this new entity, that we will call "The Cube", will exist in the coordinate system of the Ogre model. To do this, you need to create a new ''SceneNode'' as a child of the Ogre's scene node, and attach the Cube to that node. This means that all transformations applied to the Ogre's scene node will be passed down into the Cube's scene node as well. So, do the following: |
| - Add a member variable to your application class to hold the old Ogre entity (e.g. "_myOgre") and assign the entity to it when you create it in ''createScene'' | - Add a member variable to your application class to hold the old Ogre entity (e.g. "_myOgre") and assign the entity to it when you create it in ''createScene'' |
| - Add a member variable to your application class to hold the new Cube entity (e.g. "_myCube"). | - Add a member variable to your application class to hold the new Cube entity (e.g. "_myCube"). |
| - In the ''createScene'' method, add the following (after you create the Ogre entity): ''\\ | - In the ''createScene'' method, add the following (after you create the Ogre entity): <code cpp> |
| _myCube = _sceneManager->createEntity("Cube.mesh");\\ | _myCube = _sceneManager->createEntity("Cube.mesh"); |
| Ogre::SceneNode* cubenode =_myOgre->getParentSceneNode()->createChildSceneNode();\\ | Ogre::SceneNode* cubenode =_myOgre->getParentSceneNode()->createChildSceneNode(); |
| cubenode->attachObject(_myCube);'' | cubenode->attachObject(_myCube);''</code> |
| - You need to scale and then translate (position) the new Cube so that you can see it next to the Ogre:''\\ | - You need to scale and then translate (position) the new Cube so that you can see it next to the Ogre:''\\ |
| cubenode->scale(0.01, 0.01, 0.01); //Try different values \\ | cubenode->scale(0.01, 0.01, 0.01); //Try different values \\ |
| } \\ '' | } \\ '' |
| - **Instantiate Effect and Update from FrameListener** Now you have to create an instance of your effect, passing the Cube entity into it's constructor, giving it initial position and velocity values, and finally make sure to call this effect's update function in every frame, e.g. inside the FrameListener's ''frameStarted'' method (note that you'll have to pass a pointer to this effect into the FrameListener constructor so that it knows about it). Don't forget to delete your effect instance in the destructor of your application! | - **Instantiate Effect and Update from FrameListener** Now you have to create an instance of your effect, passing the Cube entity into it's constructor, giving it initial position and velocity values, and finally make sure to call this effect's update function in every frame, e.g. inside the FrameListener's ''frameStarted'' method (note that you'll have to pass a pointer to this effect into the FrameListener constructor so that it knows about it). Don't forget to delete your effect instance in the destructor of your application! |
| | - **OPTIONAL: Activate Only when Facing Ogre** To know if an object is in front of the camera, you can apply a simple dot product test. Take the vector between the camera and the object (use vector subtraction) and call that **V**. Now take the dot product between **V** and the facing vector **F** of the camera (''Ogre::Vector3 F = _Cam->getDirection();''). If this dot product is greater than 0, you know the object is in front of the camera. Finally, why don't you also check to see if the object is relatively close to the camera (you can use the Ogre::Vector3::length() method). Now you can add this to your project such that the special effect only gets updated when these two checks are passed! :-) |
| | - <box green left>This is optional</box> |
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| ===== When You Are Finished ===== | ===== When You Are Finished ===== |
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| Upload your **commented source files** into Lab2 in MySchool (zip them up if more than one). The lab projects will not be graded, but their completion counts towards your participation grade. | Upload your **commented source files** into Lab2 in MySchool (zip them up if more than one). The lab projects will not be graded, but their completion counts towards your participation grade. |
