Irrlicht Engine

Posted: **Fri Jul 11, 2008 8:57 pm**

Hi, I'm new here..

I'm using Irrlicht 1.4.1 with Visual C++ 2008 Compiler, and I want to add RTS Camera to my game. I searched in the forums and found that class:

http://irrlicht.sourceforge.net/phpBB2/ ... 066#117579

and I cant get it working. the error is something about cannot instantiate abstract class. I added consts where it need, and finally I fixed all the errors except that one:

1>c:\documents and settings\user\desktop\game\game\cgame.cpp(54) : error C2259: 'RTSCamera' : cannot instantiate abstract class
1> due to following members:
1> 'bool irr::scene::ICameraSceneNode::OnEvent(irr::SEvent)' : is abstract
1> c:\irrlicht\irrlicht-1.4.1\include\icamerascenenode.h(59) : see declaration of 'irr::scene::ICameraSceneNode::OnEvent'

I tried to change:

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virtual bool OnEvent(SEvent event);

to:

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virtual bool OnEvent(const SEvent& event);

but same error... ideas?

Thanks!!

P.S: Sorry for my english...

Posted: **Fri Jul 11, 2008 10:25 pm**

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1> 'bool irr::scene::ICameraSceneNode::OnEvent(irr::SEvent)' : is abstract

Are you absolutely sure you're building against Irrlicht 1.4.1? That OnEvent() signature is from 1.3, not 1.4. And it's implemented in the "latest version" of that RTS camera.

From what you've posted, it would appear that you're building against Irrlicht 1.3, and that you've changed RTSCamera::OnEvent(SEvent event) to RTSCamera::OnEvent(const SEvent & event)

These are the errors that I get when building that RTSCamera source against the SVN trunk (which is more or less 1.4.1):

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1>d:\dev\irrlicht-svn\examples\01.helloworld\main.cpp(837) : error C2259: 'RTSCamera' : cannot instantiate abstract class
1>        due to following members:
1>        'const irr::core::matrix4 &irr::scene::ICameraSceneNode::getProjectionMatrix(void) const' : is abstract
1>        d:\dev\irrlicht-svn\include\icamerascenenode.h(47) : see declaration of 'irr::scene::ICameraSceneNode::getProjectionMatrix'
1>        'const irr::core::matrix4 &irr::scene::ICameraSceneNode::getViewMatrix(void) const' : is abstract
1>        d:\dev\irrlicht-svn\include\icamerascenenode.h(51) : see declaration of 'irr::scene::ICameraSceneNode::getViewMatrix'
1>        'irr::f32 irr::scene::ICameraSceneNode::getNearValue(void) const' : is abstract
1>        d:\dev\irrlicht-svn\include\icamerascenenode.h(79) : see declaration of 'irr::scene::ICameraSceneNode::getNearValue'
1>        'irr::f32 irr::scene::ICameraSceneNode::getFarValue(void) const' : is abstract
1>        d:\dev\irrlicht-svn\include\icamerascenenode.h(83) : see declaration of 'irr::scene::ICameraSceneNode::getFarValue'
1>        'irr::f32 irr::scene::ICameraSceneNode::getAspectRatio(void) const' : is abstract
1>        d:\dev\irrlicht-svn\include\icamerascenenode.h(87) : see declaration of 'irr::scene::ICameraSceneNode::getAspectRatio'
1>        'irr::f32 irr::scene::ICameraSceneNode::getFOV(void) const' : is abstract
1>        d:\dev\irrlicht-svn\include\icamerascenenode.h(91) : see declaration of 'irr::scene::ICameraSceneNode::getFOV'
1>        'bool irr::scene::ICameraSceneNode::isInputReceiverEnabled(void) const' : is abstract
1>        d:\dev\irrlicht-svn\include\icamerascenenode.h(120) : see declaration of 'irr::scene::ICameraSceneNode::isInputReceiverEnabled'
1>        'bool irr::scene::ICameraSceneNode::OnEvent(const irr::SEvent &)' : is abstract
1>        d:\dev\irrlicht-svn\include\icamerascenenode.h(59) : see declaration of 'irr::scene::ICameraSceneNode::OnEvent'

I'd expect that you should start with those errors, which need more than a few consts to fix them.

Can we be sure what the problem is before we start fixing it.

Posted: **Fri Jul 11, 2008 10:48 pm**

I'm 100% sure that is Irrlicht 1.4.1. I downloaded it recently from Irrlicht website, and the ZIP name is: irrlicht-1.4.1.zip. It's the last version of the RTS camera. As I said, I fixed all these errors (added consts):

1>d:\dev\irrlicht-svn\examples\01.helloworld\main.cpp(837) : error C2259: 'RTSCamera' : cannot instantiate abstract class
1> due to following members:
1> 'const irr::core::matrix4 &irr::scene::ICameraSceneNode::getProjectionMatrix(void) const' : is abstract
1> d:\dev\irrlicht-svn\include\icamerascenenode.h(47) : see declaration of 'irr::scene::ICameraSceneNode::getProjectionMatrix'
1> 'const irr::core::matrix4 &irr::scene::ICameraSceneNode::getViewMatrix(void) const' : is abstract
1> d:\dev\irrlicht-svn\include\icamerascenenode.h(51) : see declaration of 'irr::scene::ICameraSceneNode::getViewMatrix'
1> 'irr::f32 irr::scene::ICameraSceneNode::getNearValue(void) const' : is abstract
1> d:\dev\irrlicht-svn\include\icamerascenenode.h(79) : see declaration of 'irr::scene::ICameraSceneNode::getNearValue'
1> 'irr::f32 irr::scene::ICameraSceneNode::getFarValue(void) const' : is abstract
1> d:\dev\irrlicht-svn\include\icamerascenenode.h(83) : see declaration of 'irr::scene::ICameraSceneNode::getFarValue'
1> 'irr::f32 irr::scene::ICameraSceneNode::getAspectRatio(void) const' : is abstract
1> d:\dev\irrlicht-svn\include\icamerascenenode.h(87) : see declaration of 'irr::scene::ICameraSceneNode::getAspectRatio'
1> 'irr::f32 irr::scene::ICameraSceneNode::getFOV(void) const' : is abstract
1> d:\dev\irrlicht-svn\include\icamerascenenode.h(91) : see declaration of 'irr::scene::ICameraSceneNode::getFOV'
1> 'bool irr::scene::ICameraSceneNode::isInputReceiverEnabled(void) const' : is abstract
1> d:\dev\irrlicht-svn\include\icamerascenenode.h(120) : see declaration of 'irr::scene::ICameraSceneNode::isInputReceiverEnabled'
1> 'bool irr::scene::ICameraSceneNode::OnEvent(const irr::SEvent &)' : is abstract
1> d:\dev\irrlicht-svn\include\icamerascenenode.h(59) : see declaration of 'irr::scene::ICameraSceneNode::OnEvent'

except the OnEvent one. I didn't success to fix it. That is my error:

Code: Select all

1>c:\documents and settings\user\desktop\koaradox\koaradox\cgame.cpp(54) : error C2259: 'RTSCamera' : cannot instantiate abstract class
1>        due to following members:
1>        'bool irr::scene::ICameraSceneNode::OnEvent(irr::SEvent)' : is abstract
1>        c:\irrlicht\irrlicht-1.4.1\include\icamerascenenode.h(59) : see declaration of 'irr::scene::ICameraSceneNode::OnEvent'

Thanks

BTW: I'm not using SVN.

Posted: **Sat Jul 12, 2008 12:08 am**

OK, fair enough, the other errors just need consts in the RTSCamera declarations and definitions. But this?

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1>c:\documents and settings\user\desktop\koaradox\koaradox\cgame.cpp(54) : error C2259: 'RTSCamera' : cannot instantiate abstract class
1>        due to following members:
1>        'bool irr::scene::ICameraSceneNode::OnEvent(irr::SEvent)' : is abstract
1>        c:\irrlicht\irrlicht-1.4.1\include\icamerascenenode.h(59) : see declaration of 'irr::scene::ICameraSceneNode::OnEvent'

I'm confused. I've just downloaded 1.4.1, and the signature for ICameraSceneNode::OnEvent() is indeed:

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virtual bool OnEvent(const SEvent& event) = 0;

Since the latest RTSCamera code (from the 1.3 era) has RTSCamera::OnEvent(SEvent event), then the error you should expect to get is:

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1>d:\dev\irrlicht-svn\examples\01.helloworld\main.cpp(837) : error C2259: 'RTSCamera' : cannot instantiate abstract class
1>        due to following members:
1>        'bool irr::scene::ICameraSceneNode::OnEvent(const irr::SEvent &)' : is abstract
1>        d:\dev\irrlicht-svn\include\icamerascenenode.h(59) : see declaration of 'irr::scene::ICameraSceneNode::OnEvent'

Which can be fixed simply by changing RTCamera::OnEvent() to take (const SEvent &).

Complete RTSCamera code that builds for me against Irrlicht 1.4.1:

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class RTSCamera : public ICameraSceneNode
{
   public:
      RTSCamera(IrrlichtDevice* devicepointer,ISceneNode* parent,ISceneManager* smgr,s32 id,
         f32 rotateSpeed = -1000.0f,f32 zoomSpeed = 1000.0f,f32 translationSpeed = 1000.0f);

      virtual ~RTSCamera();

      //Events
      virtual void render();
      virtual bool OnEvent(const SEvent & event);
      virtual void OnRegisterSceneNode();
      virtual void OnAnimate(u32 timeMs);

      //Setup
      virtual void setInputReceiverEnabled(bool enabled);
      virtual bool isInputReceiverEnabled() const;

      //Gets
      virtual const aabbox3d<f32>& getBoundingBox() const;
      virtual const matrix4& getProjectionMatrix() const;
      virtual const SViewFrustum* getViewFrustum() const;
      virtual vector3df getTarget() const;
      virtual const matrix4& getViewMatrix() const;
      virtual vector3df getUpVector() const;
      virtual f32 getNearValue() const;
      virtual f32 getFarValue() const;
      virtual f32 getAspectRatio() const;
      virtual f32 getFOV() const;

      //Sets
      virtual void setNearValue(f32 zn);
      virtual void setFarValue(f32 zf);
      virtual void setAspectRatio(f32 aspect);
      virtual void setFOV(f32 fovy);
      virtual void setUpVector(const vector3df& pos);
      virtual void setProjectionMatrix(const matrix4& projection);
      virtual void setPosition(const vector3df& newpos);
      virtual void setTarget(const vector3df& newpos);

      virtual void setZoomSpeed(f32 value);
      virtual void setTranslateSpeed(f32 value);
      virtual void setRotationSpeed(f32 value);


      //Helper Functions
      void pointCameraAtNode(ISceneNode* selectednode);
      void setMinZoom(f32 amount);
      void setMaxZoom(f32 amount);

      //Type Return
      virtual ESCENE_NODE_TYPE getType() const { return ESNT_CAMERA; }

      //Public Attributes
      bool atMinDistance;
      bool atMaxDistance;
      ISceneNode* selectednode;
   protected:
      //Properties
      vector3df Target;
      vector3df UpVector;
      matrix4 Projection;
      matrix4 View;
      SViewFrustum ViewArea;
      aabbox3d<f32> BBox;
      bool InputReceiverEnabled;
      dimension2d<f32> screenDim;
      f32 Fovy;   // Field of view, in radians.
      f32 Aspect;   // Aspect ratio.
      f32 ZNear;   // value of the near view-plane.
      f32 ZFar;   // Z-value of the far view-plane.

      void recalculateProjectionMatrix();
      void recalculateViewArea();

   private:
      IrrlichtDevice* device;
      vector3df Pos;
      bool zooming, rotating, moving, translating;
      f32 zoomSpeed;
      f32 translateSpeed;
      f32 rotateSpeed;
      f32 rotateStartX, rotateStartY;
      f32 zoomStartX, zoomStartY;
      f32 translateStartX, translateStartY;
      f32 currentZoom;
      f32 rotX, rotY;
      vector3df oldTarget;
      vector2df MousePos;
      bool Keys[KEY_KEY_CODES_COUNT];
      bool MouseKeys[3];
      f32 targetMinDistance;
      f32 targetMaxDistance;

      enum MOUSE_BUTTON
      {
         MOUSE_BUTTON_LEFT,
         MOUSE_BUTTON_MIDDLE,
         MOUSE_BUTTON_RIGHT
      };

      void allKeysUp();
      void allMouseButtonsUp();
      bool isKeyDown(s32 key);
      bool isMouseButtonDown(s32 key);
      void animate();
      void updateAnimationState();
}; 

RTSCamera::RTSCamera(IrrlichtDevice* devicepointer,ISceneNode* parent,ISceneManager* smgr,s32 id,
    f32 rs,f32 zs,f32 ts)
   : ICameraSceneNode(parent,smgr,id,vector3df(1.0f,1.0f,1.0f),vector3df(0.0f,0.0f,0.0f),
               vector3df(1.0f,1.0f,1.0f)),InputReceiverEnabled(true)
{
   device = devicepointer;
   BBox.reset(0,0,0);

   UpVector.set(0.0f, 1.0f, 0.0f);

   // set default projection
   Fovy = core::PI / 2.5f;   // Field of view, in radians.
   Aspect = 4.0f / 3.0f;   // Aspect ratio.
   ZNear = 1.0f;      // value of the near view-plane.
   ZFar = 100000.0f;      // Z-value of the far view-plane.

   IVideoDriver* d = smgr->getVideoDriver();
   if (d)
      Aspect = (f32)d->getCurrentRenderTargetSize().Width / (f32)d->getCurrentRenderTargetSize().Height;

   zooming = false;
   rotating = false;
   moving = false;
   translating = false;
   zoomSpeed = zs;
   rotateSpeed = rs;
   translateSpeed = ts;
   targetMinDistance = 1.0f;
   targetMaxDistance = 2000.0f;
   Target.set(0.0f,0.0f,0.0f);
   rotX = 0;
   rotY = 0;
   oldTarget = Target;

   atMinDistance = false;
   atMaxDistance = false;

   allKeysUp();
   allMouseButtonsUp();

   recalculateProjectionMatrix();
   recalculateViewArea();

   smgr->setActiveCamera(this);
}

RTSCamera::~RTSCamera()
{
}

bool RTSCamera::OnEvent(const SEvent & event)
{
   if (!InputReceiverEnabled)
      return false;

   dimension2d<s32> ssize = SceneManager->getVideoDriver()->getScreenSize();
   if(event.EventType == EET_MOUSE_INPUT_EVENT)
   {
      switch(event.MouseInput.Event)
      {
         case EMIE_LMOUSE_PRESSED_DOWN:
            selectednode = SceneManager->getSceneCollisionManager()->getSceneNodeFromScreenCoordinatesBB(device->getCursorControl()->getPosition());
            if(selectednode && selectednode->getType() == ESNT_BILLBOARD)
            {
               pointCameraAtNode(selectednode);
            }
            else
            {
               selectednode = NULL;
               MouseKeys[0] = true;
            }
            break;
         case EMIE_RMOUSE_PRESSED_DOWN:
            MouseKeys[2] = true;
            break;
         case EMIE_MMOUSE_PRESSED_DOWN:
            MouseKeys[1] = true;
            break;
         case EMIE_LMOUSE_LEFT_UP:
            MouseKeys[0] = false;
            break;
         case EMIE_RMOUSE_LEFT_UP:
            MouseKeys[2] = false;
            break;
         case EMIE_MMOUSE_LEFT_UP:
            MouseKeys[1] = false;
            break;
         case EMIE_MOUSE_MOVED:
            {
               IVideoDriver* driver = SceneManager->getVideoDriver();
               if (driver)
               {
                  MousePos.X = event.MouseInput.X / (f32)ssize.Width;
                  MousePos.Y = event.MouseInput.Y / (f32)ssize.Height;
               }
            }
            break;
         case EMIE_MOUSE_WHEEL:
            currentZoom -= event.MouseInput.Wheel * zoomSpeed;
            break;
         default:
            break;
      }

      return true;
   }

   if(event.EventType == EET_KEY_INPUT_EVENT)
   {
      Keys[event.KeyInput.Key] = event.KeyInput.PressedDown;
      return true;
   }

   return false;
}

void RTSCamera::OnRegisterSceneNode()
{
   vector3df pos = getAbsolutePosition();
   vector3df tgtv = Target - pos;
   tgtv.normalize();

   vector3df up = UpVector;
   up.normalize();

   f32 dp = tgtv.dotProduct(up);

   if ( core::equals ( fabs ( dp ), 1.f ) )
   {
      up.X += 0.5f;
   }

   ViewArea.Matrices [ ETS_VIEW ].buildCameraLookAtMatrixLH(pos, Target, up);
   ViewArea.setTransformState ( ETS_VIEW );
   recalculateViewArea();

   if( SceneManager->getActiveCamera () == this )
      SceneManager->registerNodeForRendering(this, ESNRP_CAMERA);

   if(IsVisible)
      ISceneNode::OnRegisterSceneNode();
}

void RTSCamera::render()
{
   IVideoDriver* driver = SceneManager->getVideoDriver();
   if ( driver)
   {
      driver->setTransform(ETS_PROJECTION, ViewArea.Matrices [ ETS_PROJECTION ] );
      driver->setTransform(ETS_VIEW, ViewArea.Matrices [ ETS_VIEW ] );
   }
}

void RTSCamera::OnAnimate(u32 timeMs)
{
   animate();

   ISceneNode::setPosition(Pos);
   updateAbsolutePosition();
}

void RTSCamera::setInputReceiverEnabled(bool enabled)
{
   InputReceiverEnabled = enabled;
}

bool RTSCamera::isInputReceiverEnabled() const
{
   _IRR_IMPLEMENT_MANAGED_MARSHALLING_BUGFIX;
   return InputReceiverEnabled;
}

const aabbox3d<f32>& RTSCamera::getBoundingBox() const
{
   return ViewArea.getBoundingBox();
}

const matrix4& RTSCamera::getProjectionMatrix() const
{
   return ViewArea.Matrices [ ETS_PROJECTION ];
}

const SViewFrustum* RTSCamera::getViewFrustum() const
{
   return &ViewArea;
}

vector3df RTSCamera::getTarget() const
{
   return Target;
}

const matrix4& RTSCamera::getViewMatrix() const
{
   return ViewArea.Matrices [ video::ETS_VIEW ];
}

core::vector3df RTSCamera::getUpVector() const
{
   return UpVector;
}

f32 RTSCamera::getNearValue() const
{
   return ZNear;
}

f32 RTSCamera::getFarValue() const
{
   return ZFar;
}

f32 RTSCamera::getAspectRatio() const
{
   return Aspect;
}

f32 RTSCamera::getFOV() const
{
   return Fovy;
}

void RTSCamera::setNearValue(f32 f)
{
   ZNear = f;
   recalculateProjectionMatrix();
}

void RTSCamera::setFarValue(f32 f)
{
   ZFar = f;
   recalculateProjectionMatrix();
}

void RTSCamera::setAspectRatio(f32 f)
{
   Aspect = f;
   recalculateProjectionMatrix();
}

void RTSCamera::setFOV(f32 f)
{
   Fovy = f;
   recalculateProjectionMatrix();
}

void RTSCamera::setUpVector(const vector3df& pos)
{
   UpVector = pos;
}

void RTSCamera::setProjectionMatrix(const matrix4& projection)
{
   ViewArea.Matrices [ ETS_PROJECTION ] = projection;
   ViewArea.setTransformState ( ETS_PROJECTION );
}

void RTSCamera::setPosition(const core::vector3df& pos)
{
   Pos = pos;
   updateAnimationState();

   ISceneNode::setPosition(pos);
}

void RTSCamera::setTarget(const core::vector3df& pos)
{
   Target = oldTarget = pos;
   updateAnimationState();
}

void RTSCamera::setZoomSpeed(f32 value)
{
   zoomSpeed = value;
}

void RTSCamera::setTranslateSpeed(f32 value)
{
   translateSpeed = value;
}

void RTSCamera::setRotationSpeed(f32 value)
{
   rotateSpeed = value;
}

void RTSCamera::pointCameraAtNode(ISceneNode* selectednode)
{
   vector3df totarget = getPosition() - getTarget();
   setPosition(selectednode->getPosition() + (totarget.normalize() * 100));
   setTarget(selectednode->getPosition());
   updateAnimationState();
}

void RTSCamera::setMinZoom(f32 amount)
{
   targetMinDistance = amount;
}

void RTSCamera::setMaxZoom(f32 amount)
{
   targetMaxDistance = amount;
}

void RTSCamera::recalculateProjectionMatrix()
{
   ViewArea.Matrices [ ETS_PROJECTION ].buildProjectionMatrixPerspectiveFovLH(Fovy, Aspect, ZNear, ZFar);
   ViewArea.setTransformState ( ETS_PROJECTION );
}


void RTSCamera::recalculateViewArea()
{
   ViewArea.cameraPosition = getAbsolutePosition();
   ViewArea.setFrom ( ViewArea.Matrices [ SViewFrustum::ETS_VIEW_PROJECTION_3 ] );
}

void RTSCamera::allKeysUp()
{
   for(int i = 0;i < KEY_KEY_CODES_COUNT;i++)
      Keys[i] = false;
}

void RTSCamera::allMouseButtonsUp()
{
   for (s32 i=0; i<3; ++i)
      MouseKeys[i] = false;
}

bool RTSCamera::isKeyDown(s32 key)
{
   return Keys[key];
}

bool RTSCamera::isMouseButtonDown(s32 key)
{
   return MouseKeys[key];
}

void RTSCamera::animate()
{
   f32 nRotX = rotX;
   f32 nRotY = rotY;
   f32 nZoom = currentZoom;

   vector3df translate(oldTarget);
   vector3df tvectX = Pos - Target;
   tvectX = tvectX.crossProduct(UpVector);
   tvectX.normalize();

   //Zoom
   if (isMouseButtonDown(MOUSE_BUTTON_RIGHT) && isMouseButtonDown(MOUSE_BUTTON_LEFT))
   {
      if (!zooming)
      {
         zoomStartX = MousePos.X;
         zoomStartY = MousePos.Y;
         zooming = true;
         nZoom = currentZoom;
      }
      else
      {
         f32 old = nZoom;
         nZoom += (zoomStartX - MousePos.X) * zoomSpeed * 100;

         if (nZoom < targetMinDistance)
            nZoom = targetMinDistance;
         else if (nZoom > targetMaxDistance)
            nZoom = targetMaxDistance;


         if (nZoom < 0)
            nZoom = old;
      }
   }
   else
   {
      if (zooming)
      {
         f32 old = currentZoom;
         currentZoom = currentZoom + (zoomStartX - MousePos.X ) * zoomSpeed;
         nZoom = currentZoom;

         if (nZoom < 0)
            nZoom = currentZoom = old;
      }
      zooming = false;
   }

   //Rotate
   if(isMouseButtonDown(MOUSE_BUTTON_LEFT) && !zooming)
   {
      if (!rotating)
      {
         rotateStartX = MousePos.X;
         rotateStartY = MousePos.Y;
         rotating = true;
         nRotX = rotX;
         nRotY = rotY;
      }
      else
      {
         nRotX += (rotateStartX - MousePos.X) * rotateSpeed;
         nRotY += (rotateStartY - MousePos.Y) * rotateSpeed;
      }
   }
   else
   {
      if (rotating)
      {
         rotX = rotX + (rotateStartX - MousePos.X) * rotateSpeed;
         rotY = rotY + (rotateStartY - MousePos.Y) * rotateSpeed;
         nRotX = rotX;
         nRotY = rotY;
      }

      rotating = false;
   }

   //Translate
   if(isMouseButtonDown(MOUSE_BUTTON_RIGHT) && !zooming)
   {
      if (!translating)
      {
         translateStartX = MousePos.X;
         translateStartY = MousePos.Y;
         translating = true;
      }
      else
      {
         translate += tvectX * (translateStartX - MousePos.X) * translateSpeed;
         translate.X += tvectX.Z * (translateStartY - MousePos.Y) * translateSpeed;
         translate.Z -= tvectX.X * (translateStartY - MousePos.Y) * translateSpeed;

         oldTarget = translate;
      }
   }
   else if (isKeyDown(KEY_KEY_W) || isKeyDown(KEY_UP) && !zooming)
   {
      if (!translating)
         translating = true;
      else
      {
         vector3df movevector = getPosition() - getTarget();
         movevector.Y = 0;
         movevector.normalize();

         setPosition(getPosition() - movevector * translateSpeed);
         setTarget(getTarget() - movevector * translateSpeed);
         updateAbsolutePosition();
      }
   }
   else if (isKeyDown(KEY_KEY_S) || isKeyDown(KEY_DOWN) && !zooming)
   {
      if (!translating)
         translating = true;
      else
      {
         vector3df movevector = getPosition() - getTarget();
         movevector.Y = 0;
         movevector.normalize();

         setPosition(getPosition() + movevector * translateSpeed);
         setTarget(getTarget() + movevector * translateSpeed);
         updateAbsolutePosition();
      }
   }
   else if (isKeyDown(KEY_KEY_A) || isKeyDown(KEY_LEFT) && !zooming)
   {
      if (!translating)
         translating = true;
      else
      {
         vector3df totargetvector = getPosition() - getTarget();
         totargetvector.normalize();
         vector3df crossvector = totargetvector.crossProduct(getUpVector());
         vector3df strafevector = crossvector.normalize();

         setPosition(getPosition() - strafevector * translateSpeed);
         setTarget(getTarget() - strafevector * translateSpeed);
         updateAbsolutePosition();
      }
   }
   else if (isKeyDown(KEY_KEY_D) || isKeyDown(KEY_RIGHT) && !zooming)
   {
      if (!translating)
         translating = true;
      else
      {
         vector3df totargetvector = getPosition() - getTarget();
         totargetvector.normalize();
         vector3df crossvector = totargetvector.crossProduct(getUpVector());
         vector3df strafevector = crossvector.normalize();

         setPosition(getPosition() + strafevector * translateSpeed);
         setTarget(getTarget() + strafevector * translateSpeed);
         updateAbsolutePosition();
      }
   }
   else
   {
      translating = false;

      if (!translating && !zooming && !rotating)
      {
         //Mouse Coordinates go from 0 to 1 on both axes
         if (MousePos.X < 0.05)   //Up
         {
            vector3df totargetvector = getPosition() - getTarget();
            totargetvector.normalize();
            vector3df crossvector = totargetvector.crossProduct(getUpVector());
            vector3df strafevector = crossvector.normalize();

            setPosition(getPosition() - strafevector * translateSpeed);
            setTarget(getTarget() - strafevector * translateSpeed);
            updateAbsolutePosition();
         }
         else if (MousePos.X > 0.95) //Down
         {
            vector3df totargetvector = getPosition() - getTarget();
            totargetvector.normalize();
            vector3df crossvector = totargetvector.crossProduct(getUpVector());
            vector3df strafevector = crossvector.normalize();

            setPosition(getPosition() + strafevector * translateSpeed);
            setTarget(getTarget() + strafevector * translateSpeed);
            updateAbsolutePosition();
         }
         else if (MousePos.Y < 0.05)   //Up
         {
            vector3df movevector = getPosition() - getTarget();
            movevector.Y = 0;
            movevector.normalize();

            setPosition(getPosition() - movevector * translateSpeed);
            setTarget(getTarget() - movevector * translateSpeed);
            updateAbsolutePosition();
         }
         else if (MousePos.Y > 0.95) //Down
         {
            vector3df movevector = getPosition() - getTarget();
            movevector.Y = 0;
            movevector.normalize();

            setPosition(getPosition() + movevector * translateSpeed);
            setTarget(getTarget() + movevector * translateSpeed);
            updateAbsolutePosition();
         }
      }
   }

   //Set Position
   Target = translate;

   Pos.X = nZoom + Target.X;
   Pos.Y = Target.Y;
   Pos.Z = Target.Z;

   Pos.rotateXYBy(nRotY, Target);
   Pos.rotateXZBy(-nRotX, Target);

   //Correct Rotation Error
   UpVector.set(0,1,0);
   UpVector.rotateXYBy(-nRotY, core::vector3df(0,0,0));
   UpVector.rotateXZBy(-nRotX+180.f, core::vector3df(0,0,0));
}

void RTSCamera::updateAnimationState()
{
   vector3df pos(Pos - Target);

   // X rotation
   vector2df vec2d(pos.X, pos.Z);
   rotX = (f32)vec2d.getAngle();

   // Y rotation
   pos.rotateXZBy(rotX, vector3df());
   vec2d.set(pos.X, pos.Y);
   rotY = -(f32)vec2d.getAngle();

   // Zoom
   currentZoom = (f32)Pos.getDistanceFrom(Target);
}

Posted: **Sat Jul 12, 2008 12:09 am**

wow, thanks for the code. really appreciate it.

owe you one.

Posted: **Sat Jul 12, 2008 4:43 am**

Thanks!!!

and last question.. what compiler u use?

Posted: **Sat Jul 12, 2008 10:48 am**

Visual C++ Express 2005.

Posted: **Sat Dec 27, 2008 2:41 am**

Took the code from rogerborg above and I get these errors.

Code: Select all

1>Compiling...
1>RTSCamera.cpp
1>c:\documents and settings\nick\my documents\visual studio 2008\projects\irrlicht_programs\sfod_alpha_0\sfod_alpha_0\RTSCamera.h(121) : error C2555: 'RTSCamera::getTarget': overriding virtual function return type differs and is not covariant from 'irr::scene::ICameraSceneNode::getTarget'
1>        c:\documents and settings\nick\my documents\visual studio 2008\libraries\irrlicht-1.5\include\ICameraSceneNode.h(81) : see declaration of 'irr::scene::ICameraSceneNode::getTarget'
1>c:\documents and settings\nick\my documents\visual studio 2008\projects\irrlicht_programs\sfod_alpha_0\sfod_alpha_0\RTSCamera.h(121) : error C2555: 'RTSCamera::getUpVector': overriding virtual function return type differs and is not covariant from 'irr::scene::ICameraSceneNode::getUpVector'
1>        c:\documents and settings\nick\my documents\visual studio 2008\libraries\irrlicht-1.5\include\ICameraSceneNode.h(89) : see declaration of 'irr::scene::ICameraSceneNode::getUpVector'

Posted: **Sat Dec 27, 2008 10:51 am**

Read what the errors say and fix them. Those errors say that your overloaded function returns something different than it should. Check where it points you (in this case ICameraSceneNode) and correct in RTSCamera.

Posted: **Sat Dec 27, 2008 1:03 pm**

Thanx for that helpful response.

I know what the errors say, and more then that I know what they mean. The poster of the code said it compiled. When I cut and pasted the code into a new project and got those errors I thought I would post that fact.

After a break I came back and check my version and I'm using 1.5, so I just decided it was probly something that was probly just differences between the old version and the current one.

But again, thanx for responding.

To those that don't just give up when the RTSCamera snippit on the engine's wiki doesn't work and manage to stumble upon this thread and then find the errors I posted, I am just assuming that you can change the return type of RTSCamera::getTarget to match the return type of irr::scene::ICameraSceneNode::getTarget, do the same for getUpVector, and everything should work great.

I can't say for sure, cause I gave up on that whole thing and just made a class that wrapped a ICameraSceneNode pointer and inherited from IEventReceiver as was suggested in some other random thread I've slogged through over the past 6 hours.

Irrlicht Engine

Problem with RTS Camera

Problem with RTS Camera

What about this error?