Block rotation

[Moore]

I want to do a block rotation. I have model of triangle and i rotate it. But i don't get that i want. I want something like this:

i get this:


Why irrlicht rotate it that?

There is a code:

Code: Select all

#include <irrlicht.h>

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

int i=0;


class MyEventReceiver : public IEventReceiver
{
public:

        virtual bool OnEvent(const SEvent& event)
        {

                if (event.EventType == irr::EET_KEY_INPUT_EVENT)
                        KeyIsDown[event.KeyInput.Key] = event.KeyInput.PressedDown;

                return false;
        }

 
        virtual bool IsKeyDown(EKEY_CODE keyCode) const
        {
                return KeyIsDown[keyCode];
        }
        
        MyEventReceiver()
        {
                for (u32 i=0; i<KEY_KEY_CODES_COUNT; ++i)
                        KeyIsDown[i] = false;
        }

private:
  
        bool KeyIsDown[KEY_KEY_CODES_COUNT];
};





   
int main()                    
{    
  IrrlichtDevice* device = createDevice( EDT_OPENGL, dimension2d<u32>(840, 580),
  32, false, true, false, 0);
  
 MyEventReceiver receiver;
 device->setEventReceiver(&receiver);
  IVideoDriver* video = device->getVideoDriver();
  	IGUIEnvironment* env = device->getGUIEnvironment();
   ISceneManager* smgr = device->getSceneManager();
   device ->getCursorControl()->setVisible(false);
  ICameraSceneNode *kam = smgr->addCameraSceneNodeFPS();  

 	kam->setFarValue(90000);
	kam->setPosition(core::vector3df(0,0,0));
	
env->addStaticText(L"Naciscnij ESC by wyjsc\nNaciscnij A by zmienic animacje\nNaciscnij S by rozpoczacz animacje\nNaciscnij D by zatrzymac animacje\nNaciscnij Z by wyzerowac animacje\n",
rect<s32>(700,510,840,580), true, true, 0);

IAnimatedMeshSceneNode* pud = 0;
IAnimatedMesh* pudlo = smgr->getMesh("triangle.b3d");

pud = smgr->addAnimatedMeshSceneNode(pudlo);
pud -> setScale (core::vector3df(100,100,100));
pud -> setPosition(core::vector3df(0,0,0));
pud ->setMaterialFlag(video::EMF_LIGHTING, false); 
pud ->setMaterialFlag(video::EMF_BACK_FACE_CULLING, false); 
 
while(i<=180){
     i++;         
pud = smgr->addAnimatedMeshSceneNode(pudlo);
pud -> setScale (core::vector3df(100,100,100));
pud -> setPosition(core::vector3df(0,0,0));
pud -> setRotation(core::vector3df(0,i,0));
pud ->setMaterialFlag(video::EMF_LIGHTING, false); 
pud ->setMaterialFlag(video::EMF_BACK_FACE_CULLING, false); 
}


 


 int lastFPS = -1;  //dla fps

  while(device->run())

  {


                if(receiver.IsKeyDown(KEY_ESCAPE))break;
        

                
    video->beginScene(true, true, video::SColor(255,113,113,133));
   env->drawAll();
    smgr->drawAll();
    video->endScene();
    

   	
			
    
int fps = video->getFPS();          //oblicznie i wyświetlanie fps
if (lastFPS != fps)
{
core::stringw tmp(L"Animacje ");
tmp += L"fps: ";
tmp += fps;

device->setWindowCaption(tmp.c_str());
lastFPS = fps;
}
    
    
  }
  device->drop();
  return 0;
}

[Acki]

with this loop you create 181 nodes, each rotated by 1° against the previous created one !!!

Code: Select all

while(i<=180){
     i++;         
pud = smgr->addAnimatedMeshSceneNode(pudlo);
pud -> setScale (core::vector3df(100,100,100));
pud -> setPosition(core::vector3df(0,0,0));
pud -> setRotation(core::vector3df(0,i,0));
pud ->setMaterialFlag(video::EMF_LIGHTING, false);
pud ->setMaterialFlag(video::EMF_BACK_FACE_CULLING, false);
} 

[kazymjir]

Cześć!

You doing many mistakes in your code!

Look at first loop ( while(i<=180) ),
you don't need to scale model 180 times, because you scalled it before.
Same is with setting position and material flags.

Now see at setRotation in same loop.
Model rotation is set, but it's not drawed. You are rotating 180 times model, but it's not drawed in loop, so when later in render you see 180 nodes, every rotated by 1 degree.
Move your code to main loop:

Code: Select all

    video->beginScene(true, true, video::SColor(255,113,113,133));
     i++;
    pud -> setRotation(core::vector3df(0,i,0));
   env->drawAll();
    smgr->drawAll();
    video->endScene();

Now you code will work propetly.
Node will be rotated, next drawed.

[Acki]

180 times

to be pedantic: it's 181 !!!

[kazymjir]

180 times

to be pedantic: it's 181 !!!

Ahhh, I missed that is <=, not <

Moore, and one tip: use timers in rotation, if you want to rotate node whole time
http://irrlicht.sourceforge.net/docu/example004.html

[Moore]

Nie, nie o to mi chodziło :/

Aek give me your Gygy number i'll explain what i want

[kazymjir]

ok, 13303849