Lập trình 3D game dùng Irrlicht engine !

Hướng dẫn dùng CameraRPG

1) Class quản lý bàn phím + mouse ảo

Hôm nay mình Up lên tệp tin cKeyBoard.h dùng để quản lý bàn phím ảo.
Cách dùng của nó sẽ được cụ thể trong tệp tin main.cpp phần dùng CameraRPG

////////////////

#include
using namespace irr;
extern bool keys[KEY_KEY_CODES_COUNT ];
class TKeyClass : public IEventReceiver
{
public:
TKeyClass()
{
for (int i=0;ikeys[i]=0;
}
~TKeyClass(){};
virtual bool OnEvent(SEvent event)
{
if(event.EventType == irr::EET_KEY_INPUT_EVENT)
{
keys[event.KeyInput.Key] = event.KeyInput.PressedDown;
return false;
}
if (event.EventType==irr::EET_MOUSE_INPUT_EVENT)
{
keys[irr::KEY_LBUTTON]= (event.MouseInput.Event==EMIE_LMOUSE_PRESSED_DOWN) ;
keys[irr::KEY_RBUTTON]= (event.MouseInput.Event==EMIE_RMOUSE_PRESSED_DOWN) ;
//keys[irr::KEY_XBUTTON1]=(event.MouseInput.Event==EMIE_MOUSE_MOVED);
//keys[irr::KEY_MBUTTON]= (event.MouseInput.Event==EMIE_MOUSE_WHEEL);
return false;
}
return false;
}
};

2)Tệp tin main.cpp dùng để thực thi hướng dẫn tạo CameraRPG

/////////////////////////

/*
This tutorial will briefly show how to use the terrain renderer of Irrlicht. It will also
show the terrain renderer triangle selector to be able to do collision detection with
terrain.

Note that the Terrain Renderer in Irrlicht is based on Spintz' GeoMipMapSceneNode, lots
of thanks go to him.
DeusXL provided a new elegant simple solution for building larger area on small heightmaps
-> terrain smoothing.
In the beginning there is nothing special. We include the needed header files and create
an event listener to listen if the user presses the 'W' key so we can switch to wireframe
mode and if he presses 'D' we toggle to material between solid and detail mapped.
*/
#include
#include "cKeyBoard.h"
using namespace irr;
using namespace core;
using namespace scene;
using namespace video;
using namespace io;
using namespace gui;

#pragma comment(lib, "Irrlicht.lib")
bool keys[KEY_KEY_CODES_COUNT ];
int cZoom = 80;
int cOffset = 180,cNewOffset=180;
float cUpdir = -10;
int cRotation = 0;
int oldScore =0;
bool isActive = false;
ICameraSceneNode* camera;
IAnimatedMeshSceneNode* character;
/*
The start of the main function starts like in most other example. We ask the user
for the desired renderer and start it up.
*/
int main()
{
// let user select driver type
video::E_DRIVER_TYPE driverType = video::EDT_DIRECT3D9;
IrrlichtDevice* device = createDevice(driverType, core::dimension2d(640, 480));
if (device == 0)
return 1; // could not create selected driver.
/*
First, we add standard stuff to the scene: A nice irrlicht engine
logo, a small help text, a user controlled camera, and we disable
the mouse cursor.
*/
video::IVideoDriver* driver = device->getVideoDriver();
scene::ISceneManager* smgr = device->getSceneManager();
gui::IGUIEnvironment* env = device->getGUIEnvironment();

driver->setTextureCreationFlag(video::ETCF_ALWAYS_32_BIT, true);

// add irrlicht logo
env->addImage(driver->getTexture("../../irrlicht-1.3.1/media/irrlichtlogo2.png"),
core::position2d(10,10));

//set other font
env->getSkin()->setFont(env->getFont("../../irrlicht-1.3.1/media/fontlucida.png"));

// add some help text
gui::IGUIStaticText* text = env->addStaticText(
L"Press 'W' to change wireframe mode\nPress 'D' to toggle detail map\nPress (Up,Left,Right) arrow to cotrol character",
core::rect(10,420,300,475), true, true, 0, -1, true);

// add camera
camera = smgr->addCameraSceneNode();

camera->setPosition(core::vector3df(1900*2,255*2,3700*2));
camera->setTarget(core::vector3df(2397*2,343*2,2700*2));
camera->setFarValue(12000.0f);
//add main character
character = smgr->addAnimatedMeshSceneNode(
smgr->getMesh("../../irrlicht-1.3.1/media/faerie.md2"),0,-1,
vector3df(2397*2,343*5,2700*2),vector3df(0, 0, 0),vector3df(1.0f, 1.0f, 1.0f),false);
character->setMaterialTexture(0,driver->getTexture("../../irrlicht-1.3.1/media/Faerie5.bmp"));
character->setMaterialFlag(video::EMF_LIGHTING, false);
character->setMD2Animation(EMAT_STAND);
// disable mouse cursor
//device->getCursorControl()->setVisible(false);

/*
Here comes the terrain renderer scene node: We add it just like any
other scene node to the scene using ISceneManager::addTerrainSceneNode().
The only parameter we use is a file name to the heightmap we use. A heightmap
is simply a gray scale texture. The terrain renderer loads it and creates
the 3D terrain from it.
To make the terrain look more big, we change the scale factor of it to (40, 4.4, 40).
Because we don't have any dynamic lights in the scene, we switch off the lighting,
and we set the file terrain-texture.jpg as texture for the terrain and
detailmap3.jpg as second texture, called detail map. At last, we set
the scale values for the texture: The first texture will be repeated only one time over
the whole terrain, and the second one (detail map) 20 times.
*/

// add terrain scene node
scene::ITerrainSceneNode* terrain = smgr->addTerrainSceneNode(
"../../irrlicht-1.3.1/media/terrain-heightmap.bmp",
0, // parent node
-1, // node id
core::vector3df(0.f, 0.f, 0.f), // position
core::vector3df(0.f, 0.f, 0.f), // rotation
core::vector3df(40.f, 4.4f, 40.f), // scale
video::SColor ( 255, 255, 255, 255 ), // vertexColor,
5, // maxLOD
scene::ETPS_17, // patchSize
4 // smoothFactor
);

terrain->setMaterialFlag(video::EMF_LIGHTING, false);

terrain->setMaterialTexture(1, driver->getTexture("../../irrlicht-1.3.1/media/terrain-texture.jpg"));
terrain->setMaterialTexture(0, driver->getTexture("../../irrlicht-1.3.1/media/detailmap3.jpg"));

terrain->setMaterialType(video::EMT_DETAIL_MAP);

terrain->scaleTexture(10.0f, 1.0f);
//terrain->setDebugDataVisible ( true );

/*
To be able to do collision with the terrain, we create a triangle selector.
If you want to know what triangle selectors do, just take a look into the
collision tutorial. The terrain triangle selector works together with the
terrain. To demonstrate this, we create a collision response animator
and attach it to the camera, so that the camera will not be able to fly
through the terrain.
*/

// create triangle selector for the terrain
scene::ITriangleSelector* selector
= smgr->createTerrainTriangleSelector(terrain, 0);
terrain->setTriangleSelector(selector);
selector->drop();

// create collision response animator and attach it to the main character
aabbox3df box = character->getBoundingBox();
vector3df radius = box.MaxEdge;
radius.X *=10; radius.Y *=4; radius.Z *=10;
scene::ISceneNodeAnimator* anim = smgr->createCollisionResponseAnimator(
selector, character,radius,
core::vector3df(0,-1.0f,0),
radius);
character->addAnimator(anim);
anim->drop();
/*
To make the user be able to switch between normal and wireframe mode, we create
an instance of the event reciever from above and let Irrlicht know about it. In
addition, we add the skybox which we already used in lots of Irrlicht examples.
*/
// create event receiver
TKeyClass receiver;
device->setEventReceiver(&receiver);
// create skybox
driver->setTextureCreationFlag(video::ETCF_CREATE_MIP_MAPS, false);
smgr->addSkyBoxSceneNode(
driver->getTexture("../../irrlicht-1.3.1/media/irrlicht2_up.jpg"),
driver->getTexture("../../irrlicht-1.3.1/media/irrlicht2_dn.jpg"),
driver->getTexture("../../irrlicht-1.3.1/media/irrlicht2_lf.jpg"),
driver->getTexture("../../irrlicht-1.3.1/media/irrlicht2_rt.jpg"),
driver->getTexture("../../irrlicht-1.3.1/media/irrlicht2_ft.jpg"),
driver->getTexture("../../irrlicht-1.3.1/media/irrlicht2_bk.jpg"));
driver->setTextureCreationFlag(video::ETCF_CREATE_MIP_MAPS, true);
/*
That's it, draw everything. Now you know how to use terrain in Irrlicht.
*/
///////////- khëi t¹o biÕn Camera /////////////
cZoom =80;
cOffset = 0;
cUpdir =0;
///////////////////////
int lastFPS = -1;
while(device->run())
if (device->isWindowActive())
{
driver->beginScene(true, true, 0 );
smgr->drawAll();
env->drawAll();
driver->endScene();
//////////// - RPG camera
vector3df p =character->getPosition();//box.getCenter();
vector3df r = character->getRotation();
if (smgr->getActiveCamera()==camera)
{
camera->setTarget(core::vector3df(p.X,p.Y+cUpdir,p.Z));
camera->setPosition(core::vector3df(( -1 * cZoom * cosf( -1 * ( r.Y + cRotation +cOffset ) *core::DEGTORAD ) ) + p.X,
p.Y+50,( -1 * cZoom * sinf( -1 * ( r.Y+cRotation + cOffset ) * core::DEGTORAD ) ) + p.Z));
}
///////////
if (keys[KEY_KEY_W])
{
terrain->setMaterialFlag(video::EMF_WIREFRAME, !terrain->getMaterial(0).Wireframe);
terrain->setMaterialFlag(video::EMF_POINTCLOUD, false);
keys[KEY_KEY_W] = false;
}
if (keys[KEY_KEY_P])
{
terrain->setMaterialFlag(video::EMF_POINTCLOUD, !terrain->getMaterial(0).PointCloud);
terrain->setMaterialFlag(video::EMF_WIREFRAME, false);
keys[KEY_KEY_P] = false;
}
if (keys[KEY_KEY_D])
{
terrain->setMaterialType(terrain->getMaterial(0).MaterialType == video::EMT_SOLID ?
video::EMT_DETAIL_MAP : video::EMT_SOLID);
keys[KEY_KEY_D] = false;
}
if (keys[KEY_ESCAPE]) device->closeDevice();
//////////////// - Control the Character - //////////////
if (keys[KEY_UP]) // di chuyen toi
{
p.X = p.X + ( cos((r.Y+cRotation) * core::DEGTORAD )*10.0f );
p.Z = p.Z - ( sin((r.Y+cRotation) * core::DEGTORAD )*10.0f );
character->setPosition(p);
if (!isActive)
{
character->setMD2Animation(EMAT_RUN );//di toi
isActive = true; //cho biet nhan vat dang hoat dong
}
}
if (keys[KEY_LEFT]) // queo trai
{
int goc = 1;
if (r.Y>goc) r.Y -= goc;
else r.Y =360;
character->setRotation(r);
}
if (keys[KEY_RIGHT]) // queo phai
{
int goc = 1;
if (r.Y<360-goc br="br" goc="goc" r.y="r.y">else r.Y =0;
character->setRotation(r);
}
//kiem tra phim bam
bool keypressed = false;
for (int i=0;iif ((!keypressed)&&(isActive)) //neu khong co phim bam
{
character->setMD2Animation(EMAT_STAND);
isActive = false;
}
//keys[KEY_UP] = false;
///////////////////////////////////////////////////////////////////////
// display frames per second in window title
int fps = driver->getFPS();
if (lastFPS != fps)
{
core::stringw str = L"Terrain Renderer - Irrlicht Engine [";
str += driver->getName();
str += "] FPS:";
str += fps;
// Also print terrain height of current camera position
// We can use camera position because terrain is located at coordinate origin
str += " Height: ";
str += terrain->getHeight(camera->getAbsolutePosition().X, camera->getAbsolutePosition().Z);
device->setWindowCaption(str.c_str());
lastFPS = fps;
}
}
device->drop();
return 0;
}

3) Các bạn tự tạo project và chỉnh lại các đường dẫn cho phù hợp nhé. Chúc các bạn thành công!