[vtkusers] How to use vtkGeoView/vtkGeoTerrain/vtkGeoSource

[David Thompson]

> Thanks. This is a normal way to render elevation files. Now, my
> problem is how to save and organize the results in order to form a
> vtkGeoSource object. At least I think so. I just don't get the idea,
> how to build that multi-resolution tree of terrain pathces.

Hi Olli,

The geovis kit doesn't support multiresolution elevation data; it wasn't
necessary as part of the initial use cases and so it hasn't been
implemented.

	David


> satyanarayana reddy kirjoitti 16.2.2010 kello 12.02:
> 
> > Hi,
> > See the following it might be useful to you.. For more information see the examples which use vtkDEMReader
> > 
> > vtkDEMReader* demReader = vtkDEMReader::New();
> > demReader->SetFileName(argv[1]);
> > demReader->Update();
> > vtkImageDataGeometryFilter *filter = vtkImageDataGeometryFilter::New();
> > filter->SetInputConnection(demReader->GetOutputPort());
> > vtkWarpScalar *warp = vtkWarpScalar::New();
> > warp->SetInput(filter->GetOutput());
> > warp->SetScaleFactor(1);
> > warp->UseNormalOn();
> > warp->SetNormal(0, 0, 1);
> > warp->Update();
> > vtkElevationFilter *elevation = vtkElevationFilter::New();
> > elevation->SetInputConnection(warp->GetOutputPort());
> > 
> > vtkPolyDataMapper* mapper = vtkPolyDataMapper::New();
> > mapper->SetInputConnection(elevation->GetOutputPort());
> > 
> > 
> > 
> > 
> > 
> > On Tue, Feb 16, 2010 at 2:50 PM, Olli <gammelnerd at gmail.com> wrote:
> > Hi,
> > 
> > I have a set of DEM files and should implement a multi-resolution terrain rendering solution. And ultimately place some 3D data objects to terrain view.
> > 
> > Because my data visualization already utilizes VTK, I'm looking for a solution that would use VTK also for terrain rendering. I took a look to vtkGeoView and vtkGeoTerrain classes, which already implement a multiresolution scheme. I just couldn't figure out how to get from DEM files to correct data representation.
> > 
> > - How to process DEM files to get proper vtkGeoSource geometry tiles?
> > - Do I manage with elevation data and color map only, or do I need some texture file to cover earth surface?
> > - It is possible to use vtkGeoView and vtkGeoTerrain to render terrain for smaller areas than the whole globe?
> > - And I'd like to render in planar projection, not spheric, as GeoView currently. Possible?
> > 
> > Some question to start with. I'm a bit confused...
> > 
> > Thanks,
> > 
> > Olli
> > 
> > 
> > 
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