[vtkusers] Cylindrical grid

Burlen Loring burlen.loring at kitware.com
Thu Nov 6 09:36:45 EST 2008

Hi Dave,

I see no one else has answered, probably because this is sort of open 
ended question, we don't know enough about your data to provided a 
succinct answer. At any rate I will try to provide some general info.

Vtk uses Cartesian coordinates for points, so you want to convert 
r,theta,z tuples to x,y,z tuples for each node in your data. If you are 
visualizing a solid or volume that is composed from a collection of 
elements or cells, then you first need to determine which vtk cell types 
are needed to represent your volume or solid. That will be a deciding 
factor in which dataset to use. For example vtkStructuredGrid only 
offers vtkQuad or vtkHexahedron cells, such that they can be logically 
arranged on a lattice. If your data isn't arranged in that way or you 
need to mix multiple cell types to represent your geometry then probably 
vtkUnstructuredGrid would be the way to go.

Hills David A wrote:
> Hi,
> I’m interested in visualizing some data in cylindrical coordinates. 
> Can vtk represent this? I’ve seen some hints that vtkStructuredGrid 
> could be used for this but the class reference for this explicitly 
> states that this is topologically cuboid so I can’t see how that would 
> work. Is there anything native that could be used in vtk? I saw that 
> someone asked this question here in August but got no replies so I’m 
> not holding out much hope but I thought I’d try again.
> Thanks,
> Dave
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Burlen Loring
Kitware, Inc.
R&D Engineer
28 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-371-3971 x137

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