1. Wiki3DVision Forum
General Category => 3D Reconstruction => Topic started by:
dashan on July 19, 2010, 05:25:15 PM
Title: How I display 3D model using imported point cloud
data with VTK
Post by: dashan on July 19, 2010, 05:25:15 PM
Step 1:
vtkRenderWindow *renWin = vtkRenderWindow::New();
vtkRenderWindowInteractor *iren =
vtkRenderWindowInteractor::New();
iren->SetRenderWindow(renWin);
Step 2: Input Point Cloud
FILE *stream;
if( (stream = fopen( "c:pointcloud.txt", "r" )) == NULL )
{
printf( "The file 'data.txt' was not openedn" );
// return;
}
fscanf(stream,"%d", &num);
for(int i=0;i<num;i++){
//fscanf(stream,"%f %f %f %d %d %d", &tmpdata[0],
&tmpdata[1],&tmpdata[2], &tmpcol[0], &tmpcol[1],
&tmpcol[2]);//with color
fscanf(stream,"%f %f %f", &tmpdata[0],
&tmpdata[1],&tmpdata[2]);//without color
mypoint_1[0]=tmpdata[0];

2. mypoint_1[1]=tmpdata[1];
mypoint_1[2]=tmpdata[2];
//colors->InsertNextTuple3(tmpcol[0], tmpcol[1],
tmpcol[2]);
cloud_1->InsertNextPoint(mypoint_1);
}
fclose(stream);
Step 3:
vtkPolyData* polydata_1 = vtkPolyData::New();
polydata_1->SetPoints(cloud_1);
Step 4: Build mesh
vtkDelaunay2D* del2d_1 = vtkDelaunay2D::New();
del2d_1->SetInput((vtkPointSet*)polydata_1);
del2d_1->SetTolerance(0.005);
del2d_1->Update();
Step 5:
vtkRenderer* ren_surf = vtkRenderer::New(); // create a render
ren_surf->SetBackground(0.475, 0.722, 0.15);
renWin->AddRenderer(ren_surf); // bind render with a render
window
vtkDataSetMapper* mapper = vtkDataSetMapper::New();
mapper->SetInput(del2d_1->GetOutput());
vtkActor* act = vtkActor::New();
act->SetMapper(mapper);
ren_surf->AddActor(act);
renWin->SetSize(800, 600);
iren->Initialize();

3. iren->Start();
renWin->Render();
Completed! The dispay image is attached below.
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