[Paraview] ParaView VTK Legacy File Questions

[Michael Jackson]

The only comment in a vtk legacy file is allowed on the second line of the file and must be 255 chars or less.

As for the vectors, if you are creating POINT_DATA then you MUST include data for each of the points, whether or not you actually have any data there to represent. 

 You may have to write 3 sets of POINT_DATA, one for each of Tangent, Binormal and Normal. You might be able to put a (0,0,0) as the vector to basically not have it show up but I am not sure if that would work or not.

Try this:

# vtk DataFile Version 1.0
3D Crack Modeling
ASCII
DATASET POLYDATA

POINTS 4 float
0.0 0.0 5.0
1.0 0.0 5.0
0.0 1.0 5.0
1.0 1.0 5.0

POLYGONS 2 8
3 0 1 2
3 1 3 2

LINES 2 6
2 0 1
2 2 3

POINT_DATA 4
SCALARS node_numbering int 1
LOOKUP_TABLE default
0
2
4
6

VECTORS Binormal float
0 1 0
0 1 0
0 0 0
0 1 0

VECTORS Tangent float
0 0 1
0 0 1
0 0 0
0 0 1

VECTORS Normal float
1 0 0
1 0 0
0 0 0
1 0 0


CELL_DATA 4
SCALARS cell_numbering int 1
LOOKUP_TABLE default
-1
-1
0
2


Then use the Glyph Filter to display the vectors as arrows.
___________________________________________________________
Mike Jackson                    Principal Software Engineer
BlueQuartz Software                            Dayton, Ohio
mike.jackson at bluequartz.net              www.bluequartz.net

On Feb 5, 2013, at 10:05 AM, Daniel Levitus wrote:

> I realized that my past email was not detailed enough as I was in a rush to get it out, but attached are 3 files that should help explain what I am trying to convey. The image named "No vectors" is what I currently have modeled in ParaView from the data file (also included). What I am hoping to have, is in the data file, a place to enter in the data for 3 different vectors at as many points as I want and then be able to apply a filter via ParaView so that the end result would look like the second image name BNT. 
> 
> Hopefully this makes more sense.Thank you.
> 
> Dan Levitus
> --
> Daniel Levitus
> University of Illinois Champaign-Urbana
> B.S Civil Engineering 2013
> American Society of Civil Engineers | Treasurer
> daniel.levitus at gmail.com | 847-220-2503
> 
> 
> On Mon, Feb 4, 2013 at 1:45 PM, Daniel Levitus <daniel.levitus at gmail.com> wrote:
> I have two questions regarding the VTK Legacy file format. 
> 
> The first being how can one write comments in the file without ParaView returning an error? I have tried #, %, //, /* and none have seemed to work. I have searched online as well and cannot seem to find something that suggests other methods.
> 
> The second and bit more in depth question is: How can I apply three different sets of vector data to the same point in the Legacy format? I have a simple triangular grid and at certain points I want to be able to declare Tangent, Binormal, and Normal vectors for those points.
> 
> If more clarification is required please let me know
> 
> Best,
> Dan Levitus
> --
> Daniel Levitus
> University of Illinois Champaign-Urbana
> B.S Civil Engineering 2013
> American Society of Civil Engineers | Treasurer
> daniel.levitus at gmail.com | 847-220-2503
> 
> <BNT.png><No vectors.PNG><Step 0.vtk>_______________________________________________
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