287 lines
8.9 KiB
C++
287 lines
8.9 KiB
C++
/** Example 012 Terrain Rendering
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This tutorial will briefly show how to use the terrain renderer of Irrlicht. It
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will also show the terrain renderer triangle selector to be able to do
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collision detection with terrain.
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Note that the Terrain Renderer in Irrlicht is based on Spintz'
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GeoMipMapSceneNode, lots of thanks go to him. DeusXL provided a new elegant
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simple solution for building larger area on small heightmaps -> terrain
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smoothing.
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In the beginning there is nothing special. We include the needed header files
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and create an event listener to listen if the user presses a key: The 'W' key
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switches to wireframe mode, the 'P' key to pointcloud mode, and the 'D' key
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toggles between solid and detail mapped material.
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*/
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#include <irrlicht.h>
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#include <iostream>
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using namespace irr;
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#ifdef _MSC_VER
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#pragma comment(lib, "Irrlicht.lib")
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#endif
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class MyEventReceiver : public IEventReceiver
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{
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public:
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MyEventReceiver(scene::ISceneNode* terrain)
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{
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// store pointer to terrain so we can change its drawing mode
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Terrain = terrain;
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}
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bool OnEvent(const SEvent& event)
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{
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// check if user presses the key 'W' or 'D'
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if (event.EventType == irr::EET_KEY_INPUT_EVENT && !event.KeyInput.PressedDown)
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{
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switch (event.KeyInput.Key)
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{
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case irr::KEY_KEY_W: // switch wire frame mode
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Terrain->setMaterialFlag(video::EMF_WIREFRAME,
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!Terrain->getMaterial(0).Wireframe);
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Terrain->setMaterialFlag(video::EMF_POINTCLOUD, false);
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return true;
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case irr::KEY_KEY_P: // switch wire frame mode
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Terrain->setMaterialFlag(video::EMF_POINTCLOUD,
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!Terrain->getMaterial(0).PointCloud);
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Terrain->setMaterialFlag(video::EMF_WIREFRAME, false);
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return true;
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case irr::KEY_KEY_D: // toggle detail map
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Terrain->setMaterialType(
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Terrain->getMaterial(0).MaterialType == video::EMT_SOLID ?
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video::EMT_DETAIL_MAP : video::EMT_SOLID);
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return true;
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default:
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break;
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}
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}
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return false;
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}
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private:
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scene::ISceneNode* Terrain;
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};
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/*
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The start of the main function starts like in most other example. We ask the user
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for the desired renderer and start it up.
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*/
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int main()
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{
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// let user select driver type
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video::E_DRIVER_TYPE driverType = video::EDT_DIRECT3D9;
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printf("Please select the driver you want for this example:\n"\
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" (a) Direct3D 9.0c\n (b) Direct3D 8.1\n (c) OpenGL 1.5\n"\
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" (d) Software Renderer\n (e) Burning's Software Renderer\n"\
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" (f) NullDevice\n (otherKey) exit\n\n");
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char i;
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std::cin >> i;
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switch(i)
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{
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case 'a': driverType = video::EDT_DIRECT3D9;break;
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case 'b': driverType = video::EDT_DIRECT3D8;break;
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case 'c': driverType = video::EDT_OPENGL; break;
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case 'd': driverType = video::EDT_SOFTWARE; break;
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case 'e': driverType = video::EDT_BURNINGSVIDEO;break;
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case 'f': driverType = video::EDT_NULL; break;
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default: return 1;
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}
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// create device
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IrrlichtDevice* device = createDevice(driverType,
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core::dimension2d<s32>(640, 480));
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if (device == 0)
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return 1; // could not create selected driver.
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/*
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First, we add standard stuff to the scene: A nice irrlicht engine
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logo, a small help text, a user controlled camera, and we disable
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the mouse cursor.
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*/
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video::IVideoDriver* driver = device->getVideoDriver();
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scene::ISceneManager* smgr = device->getSceneManager();
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gui::IGUIEnvironment* env = device->getGUIEnvironment();
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driver->setTextureCreationFlag(video::ETCF_ALWAYS_32_BIT, true);
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// add irrlicht logo
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env->addImage(driver->getTexture("../../media/irrlichtlogo2.png"),
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core::position2d<s32>(10,10));
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//set other font
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env->getSkin()->setFont(env->getFont("../../media/fontlucida.png"));
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// add some help text
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env->addStaticText(
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L"Press 'W' to change wireframe mode\nPress 'D' to toggle detail map",
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core::rect<s32>(10,440,250,475), true, true, 0, -1, true);
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// add camera
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scene::ICameraSceneNode* camera =
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smgr->addCameraSceneNodeFPS(0,100.0f,1.2f);
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camera->setPosition(core::vector3df(2700*2,255*2,2600*2));
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camera->setTarget(core::vector3df(2397*2,343*2,2700*2));
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camera->setFarValue(12000.0f);
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// disable mouse cursor
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device->getCursorControl()->setVisible(false);
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/*
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Here comes the terrain renderer scene node: We add it just like any
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other scene node to the scene using
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ISceneManager::addTerrainSceneNode(). The only parameter we use is a
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file name to the heightmap we use. A heightmap is simply a gray scale
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texture. The terrain renderer loads it and creates the 3D terrain from
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it.
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To make the terrain look more big, we change the scale factor of
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it to (40, 4.4, 40). Because we don't have any dynamic lights in the
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scene, we switch off the lighting, and we set the file
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terrain-texture.jpg as texture for the terrain and detailmap3.jpg as
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second texture, called detail map. At last, we set the scale values for
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the texture: The first texture will be repeated only one time over the
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whole terrain, and the second one (detail map) 20 times.
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*/
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// add terrain scene node
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scene::ITerrainSceneNode* terrain = smgr->addTerrainSceneNode(
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"../../media/terrain-heightmap.bmp",
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0, // parent node
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-1, // node id
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core::vector3df(0.f, 0.f, 0.f), // position
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core::vector3df(0.f, 0.f, 0.f), // rotation
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core::vector3df(40.f, 4.4f, 40.f), // scale
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video::SColor ( 255, 255, 255, 255 ), // vertexColor
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5, // maxLOD
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scene::ETPS_17, // patchSize
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4 // smoothFactor
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);
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terrain->setMaterialFlag(video::EMF_LIGHTING, false);
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terrain->setMaterialTexture(0,
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driver->getTexture("../../media/terrain-texture.jpg"));
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terrain->setMaterialTexture(1,
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driver->getTexture("../../media/detailmap3.jpg"));
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terrain->setMaterialType(video::EMT_DETAIL_MAP);
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terrain->scaleTexture(1.0f, 20.0f);
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//terrain->setDebugDataVisible ( true );
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/*
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To be able to do collision with the terrain, we create a triangle selector.
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If you want to know what triangle selectors do, just take a look into the
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collision tutorial. The terrain triangle selector works together with the
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terrain. To demonstrate this, we create a collision response animator
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and attach it to the camera, so that the camera will not be able to fly
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through the terrain.
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*/
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// create triangle selector for the terrain
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scene::ITriangleSelector* selector
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= smgr->createTerrainTriangleSelector(terrain, 0);
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terrain->setTriangleSelector(selector);
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// create collision response animator and attach it to the camera
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scene::ISceneNodeAnimator* anim = smgr->createCollisionResponseAnimator(
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selector, camera, core::vector3df(60,100,60),
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core::vector3df(0,0,0),
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core::vector3df(0,50,0));
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selector->drop();
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camera->addAnimator(anim);
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anim->drop();
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/* If you need access to the terrain data you can also do this directly via the following code fragment.
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*/
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scene::CDynamicMeshBuffer* buffer = new scene::CDynamicMeshBuffer(video::EVT_2TCOORDS, video::EIT_16BIT);
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terrain->getMeshBufferForLOD(*buffer, 0);
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video::S3DVertex2TCoords* data = (video::S3DVertex2TCoords*)buffer->getVertexBuffer().getData();
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// Work on data or get the IndexBuffer with a similar call.
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buffer->drop(); // When done drop the buffer again.
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/*
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To make the user be able to switch between normal and wireframe mode,
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we create an instance of the event reciever from above and let Irrlicht
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know about it. In addition, we add the skybox which we already used in
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lots of Irrlicht examples.
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*/
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// create event receiver
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MyEventReceiver receiver(terrain);
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device->setEventReceiver(&receiver);
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// create skybox
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driver->setTextureCreationFlag(video::ETCF_CREATE_MIP_MAPS, false);
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smgr->addSkyBoxSceneNode(
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driver->getTexture("../../media/irrlicht2_up.jpg"),
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driver->getTexture("../../media/irrlicht2_dn.jpg"),
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driver->getTexture("../../media/irrlicht2_lf.jpg"),
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driver->getTexture("../../media/irrlicht2_rt.jpg"),
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driver->getTexture("../../media/irrlicht2_ft.jpg"),
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driver->getTexture("../../media/irrlicht2_bk.jpg"));
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driver->setTextureCreationFlag(video::ETCF_CREATE_MIP_MAPS, true);
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/*
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That's it, draw everything.
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*/
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int lastFPS = -1;
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while(device->run())
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if (device->isWindowActive())
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{
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driver->beginScene(true, true, 0 );
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smgr->drawAll();
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env->drawAll();
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driver->endScene();
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// display frames per second in window title
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int fps = driver->getFPS();
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if (lastFPS != fps)
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{
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core::stringw str = L"Terrain Renderer - Irrlicht Engine [";
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str += driver->getName();
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str += "] FPS:";
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str += fps;
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// Also print terrain height of current camera position
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// We can use camera position because terrain is located at coordinate origin
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str += " Height: ";
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str += terrain->getHeight(camera->getAbsolutePosition().X,
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camera->getAbsolutePosition().Z);
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device->setWindowCaption(str.c_str());
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lastFPS = fps;
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}
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}
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device->drop();
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return 0;
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}
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/*
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Now you know how to use terrain in Irrlicht.
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**/
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