terrain + node problem

wiznitch · Post by **wiznitch** » Tue Apr 24, 2007 11:05 pm

for some reason, my character vibrates up and down when it is going down a terrain, im not entirely sure why, because i dont have a vector or anything pulling it down. can anyone explain why this is happening, and how to fix it. (i think its something wrong with my collision detection, but idk how it works too well)

Perceval · Post by **Perceval** » Wed Apr 25, 2007 8:37 am

It would be a good idea to post your code

wiznitch · Post by **wiznitch** » Thu Apr 26, 2007 1:40 am

ok here goes

Code: Select all


#include <irrlicht.h>
#include <iostream>

using namespace irr;


using namespace core;
using namespace scene;
using namespace video;
using namespace io;
using namespace gui;
using namespace std;

#ifdef _IRR_WINDOWS_
#pragma comment(lib, "Irrlicht.lib")
#endif

int x = 0;
int y = 0;
int z = 0;
int count;
bool leftx = false;
bool rightx = false;
bool up = false;
bool down= false;
int charz = 2260;
int chary = -30;
int charx = 2630;

scene::IAnimatedMeshSceneNode* node = 0;
class MyEventReceiver : public IEventReceiver
{
public:
	virtual bool OnEvent(SEvent event)
	{

		if (node != 0 && event.EventType == irr::EET_KEY_INPUT_EVENT&&
			event.KeyInput.PressedDown)
		{
			if(event.KeyInput.Key == KEY_KEY_W)
				{
  					if (up == false)
					{
					node->setMD2Animation(EMAT_RUN);
					up = true;
                    }
				}
			if(event.KeyInput.Key == KEY_KEY_S)
				{
                    if (down == false)
                    {
                    down = true;
    				node->setMD2Animation(EMAT_RUN);
                    }
				}
			
			if(event.KeyInput.Key == KEY_KEY_A)
				{
                 if (leftx == false)
                 {
                    leftx = true;
					node->setMD2Animation(EMAT_RUN);
                }
				}
               
			if(event.KeyInput.Key == KEY_KEY_D)
				{
                    if (rightx == false)
                    {
					node->setMD2Animation(EMAT_RUN);
					rightx = true;
                }
                 
	             	}
                  }
		if (node != 0 && event.EventType == irr::EET_KEY_INPUT_EVENT&&
			!event.KeyInput.PressedDown)
		{
			if(event.KeyInput.Key == KEY_KEY_W)
				{
  					if (up == true)
					{
					up =false;
                    }
				}
			if(event.KeyInput.Key == KEY_KEY_S)
				{
                    if (down == true)
                    {
                    down = false;
    				
                    }
				}
			
			if(event.KeyInput.Key == KEY_KEY_A)
				{
                 if (leftx == true)
                 {
                    leftx = false;
				
                }
				}
               
			if(event.KeyInput.Key == KEY_KEY_D)
				{

					rightx = false;
               

      	}
            if(rightx == false && leftx == false && up == false && down == false)
            	node->setMD2Animation(EMAT_STAND);
}		
		

		return false;
	}
	
};

int main()
{

MyEventReceiver receiver; 
IrrlichtDevice *device = createDevice(EDT_OPENGL, core::dimension2d<s32>(640, 480), 32, false, false, false, &receiver);	

	device->setWindowCaption(L"Testing program");


	IVideoDriver* driver = device->getVideoDriver();
	ISceneManager* smgr = device->getSceneManager();
	IGUIEnvironment* guienv = device->getGUIEnvironment();
    driver->setTextureCreationFlag(video::ETCF_ALWAYS_32_BIT, true);


	IAnimatedMesh* mesh = smgr->getMesh("sydney.md2");
	node = smgr->addAnimatedMeshSceneNode( mesh );

//ICameraSceneNode * cam = smgr->addCameraSceneNodeFPS(0, 0,0);
ICameraSceneNode * cam = smgr->addCameraSceneNode(0, vector3df(charx,chary+60,charz-120), vector3df(charx,chary,charz));
//	camera->setPosition(core::vector3df(1900*2,255*2,3700*2));
	cam->setTarget(core::vector3df(charx,chary,charz));
	cam->setFarValue(12000.0f);

	// disable mouse cursor
	device->getCursorControl()->setVisible(false);


	scene::ITerrainSceneNode* terrain = smgr->addTerrainSceneNode( 
		"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(40.0f, 3.3f, 40.0f),	// scale
		video::SColor ( 255, 255, 255, 255 ),	// vertexColor,
		5,										// maxLOD
		scene::ETPS_17,							// patchSize
		4										// smoothFactor
		);

	terrain->setMaterialFlag(video::EMF_LIGHTING, false);
	terrain->setMaterialTexture(0, driver->getTexture("media/terrain-texture.jpg"));
	terrain->setMaterialTexture(1, driver->getTexture("media/detailmap3.jpg"));
	
	terrain->setMaterialType(video::EMT_DETAIL_MAP);
	terrain->setPosition(vector3df(-1000,-900,600));
	terrain->scaleTexture(1.0f, 20.0f);


 	if (node)
{
		node->setMaterialFlag(EMF_LIGHTING, false);
		node->setMD2Animation (scene::EMAT_STAND );
		node->setMaterialTexture( 0, driver->getTexture("sydney.bmp") );
        //node->setPosition(vector3df(2397*2,343*2,2700*2));
        node->setPosition(core::vector3df(charx,chary,charz));
                	}
	// create triangle selector for the terrain	
	scene::ITriangleSelector* selector
		= smgr->createTerrainTriangleSelector(terrain, 0);
	terrain->setTriangleSelector(selector);
	selector->drop();
		ISceneNodeAnimator* anim2 = smgr->createCollisionResponseAnimator(
		selector, node,core::vector3df(60,50,60),
		core::vector3df(0,-9.8f,0), 
		core::vector3df(0,50,0));
	node->addAnimator(anim2);

	anim2->drop();

	driver->setTextureCreationFlag(video::ETCF_CREATE_MIP_MAPS, false);

	smgr->addSkyBoxSceneNode(
		driver->getTexture("media/irrlicht2_up.jpg"),
		driver->getTexture("media/irrlicht2_dn.jpg"),
		driver->getTexture("media/irrlicht2_lf.jpg"),
		driver->getTexture("media/irrlicht2_rt.jpg"),
		driver->getTexture("media/irrlicht2_ft.jpg"),
		driver->getTexture("media/irrlicht2_bk.jpg"));

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


	int lastFPS = -1;

	while(device->run())
	{
  if (up == true)
     {
   	core::vector3df v = node->getPosition();
	v.Z += 5.0f;
    node->setRotation(core::vector3df(0,270,0));
	node->setPosition(v);
	core::vector3df r = cam->getPosition();

	cam->setTarget(v);
     }
       if (down == true)
     {
   	core::vector3df v = node->getPosition();
	v.Z -= 5.0f;
    node->setRotation(core::vector3df(0,90,0));
	node->setPosition(v);
		core::vector3df r = cam->getPosition();

	cam->setTarget(v);
     }
       if (leftx == true)
     {
   	core::vector3df v = node->getPosition();
	v.X -= 5.0f;
    node->setRotation(core::vector3df(0,180,0));
	node->setPosition(v);
	vector3df r = cam->getPosition();

	cam->setTarget(v);
     }
            if (rightx == true)
     {
   	core::vector3df v = node->getPosition();
	v.X += 5.0f;
    node->setRotation(core::vector3df(0,0,0));
	node->setPosition(v);
    
	cam->setTarget(v);
     }
     if (rightx == true && down == true)
     node->setRotation(core::vector3df(0,45,0));
     if (rightx == true && up == true)
     node->setRotation(core::vector3df(0,315,0));
     if (leftx == true && down == true)
     node->setRotation(core::vector3df(0,135,0));
     if (leftx == true && up == true)
     node->setRotation(core::vector3df(0,225,0));
	if (device->isWindowActive())
	{
vector3df r = node->getPosition();
r.Y += 60;
r.Z -=120;
cam->setPosition(r);
stringw str = L"Terrain Renderer - Irrlicht Engine [";
			str += charx;
			str += " : ";
            str += chary;
            str += " : ";
            str += charz;
device->setWindowCaption(str.c_str());
		driver->beginScene(true, true, 0 );
 x++;
 if (x>360)
 x=0;
	smgr->drawAll();
		guienv->drawAll();

		driver->endScene();
}
		// display frames per second in window title

}
	device->drop();

	return 0;
}

wiznitch · Post by **wiznitch** » Thu Apr 26, 2007 1:41 am

im pretty sure that it has something to do with the collision detection part, although i am not completely sure, still getting used to the features =p. if you can help, thanks

Perceval · Post by **Perceval** » Thu Apr 26, 2007 10:16 am

The problem could come from the event receiver. You always return false in your onEvent function. I think you should change your onEvent function (search for the boolkeys method in the forum, it's a good and easy way to handle the keyboard).
My guess is that the boolean irrlicht return in this function is used to tell irrlicht that we have taken this event in account (please, correct me if i'm wrong), and in your case, this would mean that they are always called. But once again, it' pure speculation from me...