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List:       vtkusers
Subject:    [vtkusers] How do I specify polygon based texture coordinates in
From:       "Day, Michael A AMRDEC/UAH" <mike.a.day () us ! army ! mil>
Date:       2005-07-28 20:16:25
Message-ID: 1075213EFAF9BA4181A250B072635947F14C8C () AMR-EX6 ! ds ! amrdec ! army ! mil
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Howdy,

The following is a message from a previous question answered by this mailing list.  \
By my estimate, the vtkTCoord class is absent from the VTK since at least version \
4.2.  Is there a different way to use polygonal texture coordinates now?  Note that I \
am NOT interested in automatic texture mapping (I've already got the texture \
coordinates, and I'd like to use them).

Thanks,

Mike Day

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[vtkusers] Texture mapping

David Gobbi dgobbi at irus.rri.ca 
Fri Jun 29 12:38:49 EDT 2001 


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Hi Remo,

Just set up your points & your polygons so that the triangles don't share
any points.  Waste a bit of memory, in other words.

 - David

On Fri, 29 Jun 2001, Remo Ziegler wrote:

> Hi David,
> 
> thanks a lot for your help. Do you know how I can map one 3D-point on several \
> texture-points? The problem is, that every triangle is stored independently from \
> the other in the texture file, so that a 3Dpoint can be mapped on several different \
> positions in the texture file. 
> Thanks a lot for your help again!!
> 
> Greets .... Remo
> 
> David Gobbi wrote:
> 
> > Hi Remo,
> > 
> > It's about the same in VTK.  In a situation where you already have
> > the vertices & texture coords, you can build a vtkPolyData like this:
> > 
> > points = vtkPoints::New();
> > points->InsertNextPoint(x,y,z)  // repeat for all points
> > ...
> > 
> > polys = vtkCellArray::New();
> > polys->InsertNextCell(n);       // n is number of points in polygon
> > polys->InsertCellPoint(i);      // i is index into above 'points' list
> > polys->InsertCellPoint(j);      // etc. for each point in polygon
> > ...
> > polys->InsertNextCell(m);       // next polygon
> > ...
> > 
> > tcoords = vtkTCoords::New();
> > tcoords.InsertNextTCoord(tx,ty,0.0); // one tcoord per point
> > ...
> > 
> > data = vtkPolyData::New();
> > data->SetPoints(points);
> > data->SetPolys(polys);
> > data->GetPointData()->SetTCoords(tcoords);
> > 
> > Done!  If you want to set normals for the points, you do it
> > the same way as for the TCoords.
> > 
> > - David
> > 
> > --
> > David Gobbi, MSc                       dgobbi at irus.rri.ca
> > Advanced Imaging Research Group
> > Robarts Research Institute, University of Western Ontario
> > 
> > On Fri, 29 Jun 2001, Remo Ziegler wrote:
> > 
> > > Hi,
> > > 
> > > I have a vtkPolyData object describing the polygonal  model and a
> > > bmp-File to describe the texture for it. Since the texture file has a
> > > certain structure, I want to map every triangle of vtkPolyData to a
> > > triangle in the bmp-file describing the texture.
> > > In OpenGL I would use the glTextCoord2f(..., ....); glVertex3f(...,
> > > ...., ....); construction ... is there any similar stuff in vtk?
> > > 
> > > Thanks for your help! Have a nice weekend !!
> > > 
> > > Greets .... Remo
> > > 
> > > 
> > > _______________________________________________
> > > This is the private VTK discussion list.
> > > Please keep messages on-topic. Check the FAQ at: \
> > > <http://public.kitware.com/cgi-bin/vtkfaq> Follow this link to \
> > > subscribe/unsubscribe: http://public.kitware.com/mailman/listinfo/vtkusers
> > > 
> 





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