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--- public:t-gede-14-1:lab7 [2014/03/03 17:34] – [Bonus] marino
+++ public:t-gede-14-1:lab7 [2024/04/29 13:33] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
-====== LAB6: Programmable Shaders ======
+====== LAB7: Programmable Shaders ======
-This lab is based on a variety of sources, including the [[http://www.ogre3d.org/tikiwiki/tiki-index.php?page=Shaders&structure=Cookbook|Ogre Shaders Wiki]].
+This lab is based on a variety of sources, including the [[http://www.ogre3d.org/tikiwiki/tiki-index.php?page=Shaders&structure=Cookbook|Ogre Shaders Wiki]].
 ===== Discussion =====
-Discussion thread for this lab is here: [[http://ruclasses.proboards.com/index.cgi?action=display&board=gedespring2013&thread=123|Lab 6 Discussion Thread]]
+Discussion thread for this lab is here: [[https://piazza.com/class/i4l9of1fw8j3ew?cid=54|Lab 7 Discussion Thread]]
 ===== Goal ======
@@ Line 22: / Line 22: @@
 Follow these steps to complete the lab project:
-  - **Create a New Project** Create a new empty project called "Lab6" in the same way you have created new projects for other lab projects. Create the Lab6Main.cpp file that contains a minimal Ogre application that displays at least one ground plane and an Ogre model. You can use your own application, or you can use the following code: <code cpp>
+  - **Create a New Project** Create a new empty project called "Lab7" in the same way you have created new projects for other lab projects. You can use your own application, or you can use the following {{:public:t-gede-14-1:lab6_handout.7z|code}}:
-#include "OGRE/Ogre.h";
-class MyApplication {
-private:
-	Ogre::SceneManager*     _sceneManager;
-	Ogre::Root*	        _root;
-	Ogre::Entity*		_ogre;
-	Ogre::Entity*		_ground;
-	Ogre::Camera*		_camera;
-public:
-	MyApplication() {
-		_sceneManager = NULL;
-		_root = NULL;
-		_ogre = NULL;
-		_ground = NULL;
-	}
-	~MyApplication() {
-		delete _root;
-	}
-	void loadResources() {
-		Ogre::ConfigFile cf;
-		cf.load("resources_d.cfg");
-		Ogre::ConfigFile::SectionIterator sectionIter = cf.getSectionIterator();
-		Ogre::String sectionName, typeName, dataName;
-		while(sectionIter.hasMoreElements()) {
-			sectionName=sectionIter.peekNextKey();
-			Ogre::ConfigFile::SettingsMultiMap *settings =sectionIter.getNext();
-			Ogre::ConfigFile::SettingsMultiMap::iterator i;
-			for(i=settings->begin(); i!=settings->end(); ++i) {
-				typeName=i->first;
-				dataName=i->second;
-				Ogre::ResourceGroupManager::getSingleton().addResourceLocation(dataName, typeName, sectionName);
-			}
-		}
-		Ogre::ResourceGroupManager::getSingleton().initialiseAllResourceGroups();
-	}
-	void createScene() {
-		_ogre =_sceneManager->createEntity("Sinbad.mesh");
-		_sceneManager->getRootSceneNode()->createChildSceneNode()->attachObject(_ogre);
-		Ogre::Plane plane(Ogre::Vector3::UNIT_Y,-5);
-		Ogre::MeshManager::getSingleton().createPlane("plane",Ogre::ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME,plane,1500,1500,200,200,true,1,5,5,Ogre::Vector3::UNIT_Z);
-		Ogre::Entity* _ground=_sceneManager->createEntity("LightPlaneEntity","plane");
-		_sceneManager->getRootSceneNode()->createChildSceneNode()->attachObject(_ground);
-                // HERE YOU SET THE MATERIALS FOR EACH OBJECT
-                // e.g. _ogre->setMaterialName(<put name here>);
-                // e.g. _ground->setMaterialName(<put name here>);
-		Ogre::Light* light = _sceneManager->createLight("Light1");
-		light->setType(Ogre::Light::LT_POINT);
-		light->setPosition(Ogre::Vector3(-10.0, 10.0, 5.0));
-	}
-	int startup() {
-		_root=new Ogre::Root("Plugins_d.cfg");
-		if(!_root->showConfigDialog()) {
-			return -1;
-		}
-		Ogre::RenderWindow* window=_root->initialise(true,"Ogre3D Lab6");
-		_sceneManager=_root->createSceneManager(Ogre::ST_GENERIC);
-		_camera=_sceneManager->createCamera("Camera");
-		_camera->setPosition(Ogre::Vector3(0,0,50));
-		_camera->lookAt(Ogre::Vector3(0,0,0));
-		_camera->setNearClipDistance(5);
-		Ogre::Viewport* viewport=window->addViewport(_camera);
-		viewport->setBackgroundColour(Ogre::ColourValue(0.0,0.0,0.5));
-		_camera->setAspectRatio(Ogre::Real(viewport->getActualWidth())/Ogre::Real(viewport->getActualHeight()));
-		loadResources();
-		createScene();
-		_root->startRendering();
-		return 0;
-	}
-};
-int main(void) {
-	MyApplication app;
-	app.startup();
-	return 0;
-}
-</code>
   - **Fixed Diffuse Color Fragment Shader** The first shader program we create is a fragment shader that simply returns a fixed color for each fragment that gets processed. In Ogre you can write shader programs in any of the major high-level shading languages, but we will be using **Cg**. Create a new shader program file called ''diffuseshader.cg'' in your ''Materials'' folder and place the following code inside it:<code c>
 float4 main_orange_fp(in float3 TexelPos : TEXCOORD0) : COLOR {
@@ Line 457: / Line 364: @@
 _water = _sceneManager->createEntity("WaterPlane", "WaterSurface");
 _sceneManager->getRootSceneNode()->createChildSceneNode("_water")->attachObject(_water);
-_water->getParentSceneNode()->translate(Ogre::Vector3::UNIT_Y*3);</code>
+_water->getParentSceneNode()->translate(Ogre::Vector3::UNIT_Y*3);</code> Dont forget to add the member <code cpp> Ogre::Entity* _water;</code>
-      - **Water surface** If you think about a water surface, you can imagine it has no actual colour, it has generally 3 elements looking at it with our simple goggles; reflection, some colouring of different light scattering about the water volume, and a distorted image of the bottom of the water since its mostly transparent.
+      - **Water surface** If you think about a water surface, you can imagine it has no actual colour, it has generally 3 elements when looking at it with our simple goggles; reflection, some colouring of different light scattering about the water volume, and a distorted image of the bottom of the water since its mostly transparent.
       - **For this exercise we will skip the reflection :)** lets focus on the bottom. The bottom is really just what is behind the water surface in the general view direction, but slightly distorted. So what we want to do is draw what the camera sees but exclude the water surface, and save it in a RenderTarget. To do that we send our normal camera to the createRenderTarget function, but we will need to add the following line to the function: <code cpp>_renderTexture->getViewport(0)->setVisibilityMask(0xFFFFFFF0); </code> The default visibility mask for objects is 0xFFFFFFFF... depending on the version of Ogre, you dont have to worry about that now. Now the render texture will exclude everything that has the mask 0xF or lower. So that is where we will want to place our water surface.
       - **Exclude the water from the RenderTarget** Now we have to specify the visibility mask of our water surface: <code cpp>_water->setVisibilityFlags(0xF); </code>
@@ Line 555: / Line 462: @@
 	}
 } </code>
-      - **Then finally we will need to put that material on the water surface** <code cpp>_water->setMaterialName("custom/MyWater");
+      - **Then finally we will need to put that material on the water surface** and download the {{:public:t-gede-14-1:offsetmap.png?linkonly|offsetTexture}} <code cpp>_water->setMaterialName("custom/MyWater");
  </code>
@@ Line 561: / Line 468: @@
 ===== When You Are Finished =====
-Upload your **commented source files** into Lab6 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 Lab7 in MySchool along with your Material and shader programs. (zip them up if more than one). The lab projects will not be graded, but their completion counts towards your participation grade.