[vtkusers] [Fwd: Re: Using OpenGl with VTK]

[Mohammed Amine SAHTARI]

I use vtkStandardNewMacro to add New macro. The problem is that I got 5 link
errors even if I include the librairies of VTK (In VS 8).
Hereby, you find my derived class (.h & .cxx).

---------------- vtkMyDerivedProp.h -------------------------

#ifndef __vtkMyDerivedProp_h
#define __vtkMyDerivedProp_h
#include "vtkProp.h"

class VTK_RENDERING_EXPORT vtkMyDerivedProp : public vtkProp
{
public:

  vtkTypeRevisionMacro(vtkMyDerivedProp,vtkProp);
  void PrintSelf(ostream& os, vtkIndent indent);
  static vtkMyDerivedProp* New();

protected:

  vtkMyDerivedProp();
  ~vtkMyDerivedProp();

private:

  vtkMyDerivedProp(const vtkMyDerivedProp&);  // Not implemented.
  void operator=(const vtkMyDerivedProp&);  // Not implemented.

};

#endif
---------------- vtkMyDerivedProp.cxx -------------------------

#include "vtkMyDerivedProp.h"

#include "vtkObjectFactory.h"

vtkCxxRevisionMacro(vtkMyDerivedProp, "$Revision: 1.36 $");

vtkStandardNewMacro(vtkMyDerivedProp);

vtkMyDerivedProp::vtkMyDerivedProp(){}

vtkMyDerivedProp::~vtkMyDerivedProp(){}

void vtkMyDerivedProp::PrintSelf(ostream& os, vtkIndent indent)
{
 this->Superclass::PrintSelf(os,indent);
}

-------------------------------------- Errors
------------------------------------------

*I got 5 errors *

1>vtkMyDerivedProp.obj : error LNK2001: unresolved external symbol "private:
virtual char const * __thiscall
vtkMyDerivedProp::GetClassNameInternal(void)const "
(?GetClassNameInternal at vtkMyDerivedProp@@EBEPBDXZ)

1>vtkMyDerivedProp.obj : error LNK2001: unresolved external symbol "public:
virtual int __thiscall vtkMyDerivedProp::IsA(char const *)"
(?IsA at vtkMyDerivedProp@@UAEHPBD at Z)

1>vtkMyDerivedProp.obj : error LNK2001: unresolved external symbol
"protected: virtual class vtkObjectBase * __thiscall
vtkMyDerivedProp::NewInstanceInternal(void)const "
(?NewInstanceInternal at vtkMyDerivedProp@@MBEPAVvtkObjectBase@@XZ)

1>vtkMyDerivedProp.obj : error LNK2019: unresolved external symbol
"__declspec(dllimport) const vtkMyDerivedProp::`vftable'"
(__imp_??_7vtkMyDerivedProp@@6B@) referenced in function "protected:
__thiscall vtkMyDerivedProp::vtkMyDerivedProp(void)" (??0vtkMyDerivedProp@
@IAE at XZ)

1>C:\Documents and Settings\asahtari\Mes
documents\Projet\Bibillothéques\VTK\MyTest\MyLib.dll : fatal error LNK1120:
4 unresolved externals
When I put vtkMyDerivedProp instead of vtkProp3D, it compiles without any
error.
I don't understand .Is it a matter of VTK librairies ? Please Help!

Amine

2008/8/14 Utkarsh Ayachit <utkarsh.ayachit at kitware.com>

> Please keep the questions to the mailing list, so that others can
> benefit/contribute as well.
>
> To add New():
> * take a look at any concrete class in VTK eg. vtkCollection (the New is
>  declared in the header and defined using
> vtkStandardNewMacro(vtkCollection); in the cxx.
>
> * not using the viewport in the RenderOpaqueGeometry should not be a
> problem. It's only provided if needed.
>
> Utkarsh
>
>
>
>
> Mohammed Amine SAHTARI wrote:
>
>> Thank you very much Utkarsh.
>>
>> I am tring to implement your solution but I have some problems.
>>
>> 1) I create vtkMyDerivedProp.h and vtkMyDerivedProp.cxx
>>
>>  I subclass vtkProp :
>>       - I copy the class code of vtkProp3D (.h and .c files)
>>       - I replace all the words :
>>               vtkProp3D /by/ /vtkMyDerivedProp /and Prop3D by
>> /MyDerivedProp/
>>       - I include /"vtkGl.h"/ in vtkMyDerivedProp.h
>>       - I add RenderOpaqueGeometry() in vtkMyDerivedProp.h like this :
>>               /virtual int RenderOpaqueGeometry(vtkViewPort* )
>>               {/
>>
>> /             glBegin (GL_LINES);
>>
>>             glVertex2f (-2.5, 2.5);
>>
>>             glVertex2f (2.5, -2.5);
>>
>>
>>             glEnd ();/
>>
>> /               }/
>>
>> 2) In my program :
>>  - I include and instantiate vtkMyDerivedProp :
>>
>>    /  //# include "vtkMyDerivedProp.h"
>>      vtkMyDerivedProp *MyDerivedProp;/
>>
>> -         I use  vtkMyDerivedProp :
>>
>> /     vtkRenderer  *renderer = vtkRenderer  ::New();/
>>
>> /      vtkMyDerivedProp-> RenderOpaqueGeometry(renderer);/
>>
>> /      renderer->AddProp(vtkMyDerivedProp);/
>>
>>
>> *Problem *: vtkMyDerivedProp is used without been defined!
>>
>> *Question 1 :* How can I define it ?   (vtkMyDerivedProp::New()  doesn't
>> work)
>>
>> *Question 2 :*  RenderOpaqueGeometry has vtkViewPort* in input but doesn't
>> use it. Is it a problem ?
>>
>> How can I fix this?
>>
>> Looking forward to hear from you soon,
>>
>> Amine**
>>
>>
>>
>>
>>
>>
>> 2008/8/14 Utkarsh Ayachit <utkarsh.ayachit at kitware.com <mailto:
>> utkarsh.ayachit at kitware.com>>
>>
>>    iren->Start() results in repeated calls to renWin->Render() on
>>    interaction. This will clear whatever you had drawn. A better
>>    approach is to subclass vtkProp(or one of it's subclasses) and put
>>    your rendering code in RenderOpaqueGeometry() /
>>    RenderTranslucentPolygonalGeometry()/ RenderOverlay() etc. depending
>>    upon what pass you want it to be rendered and then add the prop to
>>    the renderer. That way every time the renderer re-renders, your code
>>    will be executed.
>>
>>
>>    Utkarsh
>>
>>    Mohammed Amine SAHTARI wrote:
>>
>>
>>        I want to add an OpenGl code in an application of VTK.
>>
>>        For this purpose, I try to draw lines using commands OpenGL.:
>>
>>        *1) I add this on the top of the program :*
>>
>>        #include <GL/gl.h>
>>        *2) I place my OpenGL commands after renWin->Render() but before
>>        iren->Start()** :  *
>>
>>
>>        renWin->Render();
>>
>>           glBegin (GL_LINES);
>>              glVertex2f (-2.5, 2.5);
>>              glVertex2f (2.5, -2.5);
>>            glEnd ();
>>
>>        iren->Start();
>>
>>
>>        *But it doesn't appears.*
>>
>>        did I miss something ? How can I do this work ?
>>        Looking forward to hear from you soon,
>>
>>        Amine
>>
>>
>>
>>
>>  ------------------------------------------------------------------------
>>
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>>
>>
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