[vtkusers] Anyone knows the 'off' file format?

[Tim Hutton]

Hi Pingkun,

I use the following code to read OFF files. I'm not sure it copes with 
everything possible in the OFF format. I could very easily make this into a 
vtkOFFReader if there was much desire in the community.

Tim.


FILE *in = fopen(filename,"r");
if(!in) return FALSE;

int n_pts,n_polys;
fscanf(in,"OFF\n%d %d 0\n",&n_pts,&n_polys);

vtkPolyData *poly = vtkPolyData::New();
vtkPoints *points = vtkPoints::New();
vtkCellArray *polys = vtkCellArray::New();
// read the points from the file
float p[3];
int i,j;
for(i=0;i<n_pts;i++)
{
    fscanf(in,"%f %f %f\n",&p[0],&p[1],&p[2]);
    points->InsertPoint(i,p);
}
for(i=0;i<n_polys;i++)
{
    vtkIdType n_vertices;
    fscanf(in,"%d ",&n_vertices);
    polys->InsertNextCell(n_vertices);
    vtkIdType vertex_id;
    for(j=0;j<n_vertices;j++)
    {
       fscanf(in,"%d ",&vertex_id);
       polys->InsertCellPoint(vertex_id);
    }
}
poly->SetPoints(points);
points->Delete();
poly->SetPolys(polys);
polys->Delete();

mapper->SetInput(poly);
poly->Delete();

etc..


At 19:43 18/02/2004 +0800, Yan Pingkun wrote:

>Hi,
>
>Has anyone experienced the 'off' file format? The file stores 3D points 
>and geometry for an object. I got an illustration file for it. But I still 
>can't figure out what are the data after reading it. Also, how to 
>visualize the data with vtk?
>
>Thanks!
>
>Regards,
>Pingkun

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Tim Hutton,                           http://www.eastman.ucl.ac.uk/~thutton
Research Fellow & PhD student,                   T.Hutton at eastman.ucl.ac.uk
MINORI Project, Biomedical Informatics Unit,
Eastman Dental Institute, UCL,                   Tel: [+44] (0)20 7915 2344
256 Gray's Inn Road, London WC1X 8LD, UK         Fax: on request
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