[vtkusers] Migrating from OpenGL to OpenGL2

[Ken Martin]

If you are using the generic Rendering API (vtkActor/vtkCamera/etc) then
code should mostly work unchanged. If you are directly working with the
OpenGL implementation then the conversion really depends on what you were
doing as the implementation is fairly different. In terms of the two
specific issues you mentioned vtkgl.h can probably be replaced with
vtk_glew.h, I do not recall what vtkOpenGLHardwareSupport does but there is
no match for that class in the new backend. Given that you have a class
named vtkVertexBufferObject I am guessing you are getting into very
specific implementation details so the conversion may not be trivial. On
the plus side the new back end includes classes such as
vtkOpenGLVertexBufferObject so ...  If you have further
questions/roadblocks let me know and I'll try to point you in the right
direction.

P.S. vtkOpenGLPointGaussianMapper in the new backend may be worth a look
too as it renders both points and splats etc.

Thanks
Ken


On Thu, Nov 19, 2015 at 5:10 PM, VictorLamoine <victor.lamoine at gmail.com>
wrote:

> Hello,
>
> The library I'm using (Point Cloud Library) cannot be compiled as is
> against
> a VTK version with OpenGL2 back end. (I'm using VTK trunk)
> There are some missing includes etc.
>
> Error examples:
>
> > In file included from
> >
> /home/victor/libraries/pcl/src/visualization/src/vtk/vtkVertexBufferObject.cxx:15:0:
> >
> /home/victor/libraries/pcl/src/visualization/include/pcl/visualization/vtk/vtkVertexBufferObject.h:35:62:
> > fatal error: vtkgl.h: No such file or directory
> >  #include "vtkgl.h" // Needed for gl data types exposed in API
> >                                                               ^
> > compilation terminated.
> > [ 50%] Built target pcl_poisson_reconstruction
> > In file included from
> >
> /home/victor/libraries/pcl/src/visualization/src/vtk/vtkVertexBufferObjectMapper.cxx:18:0:
> >
> /home/victor/libraries/pcl/src/visualization/include/pcl/visualization/vtk/vtkVertexBufferObject.h:35:62:
> > fatal error: vtkgl.h: No such file or directory
> >  #include "vtkgl.h" // Needed for gl data types exposed in API
> >                                                               ^
> > compilation terminated.
> >
> >
> /home/victor/libraries/pcl/src/visualization/src/pcl_visualizer.cpp:87:38:
> > fatal error: vtkOpenGLHardwareSupport.h: No such file or directory
> >  #include
> > <vtkOpenGLHardwareSupport.h>
> >                                       ^
> > compilation terminated.
>
> Is there a migration guide helping users getting their code working with
> OpenGL2 back end?
> if not, how do I make the association between old/new includes? (and maybe
> there are some differences in the classes ?)
>
> Bye
>
>
>
> --
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-- 
Ken Martin PhD
Chairman & CFO
Kitware Inc.
28 Corporate Drive
Clifton Park NY 12065
518 371 3971

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