3D Color plot with 'DATASET STRUCTURED GRID'

[Shahid Maqbool]

Dear all,

The output of my program has this data structure. I want to plot
a 3D color plot; so which command I should use here?

# vtk DataFile Version 2.0
time_10.vtk
ASCII
DATASET STRUCTURED_GRID
DIMENSIONS 64 64 1
POINTS 4096 float
0.000000e+00 0.000000e+00 0.000000e+00
0.000000e+00 1.000000e+00 0.000000e+00
0.000000e+00 2.000000e+00 0.000000e+00
0.000000e+00 3.000000e+00 0.000000e+00
0.000000e+00 4.000000e+00 0.000000e+00
.
.
.
POINT_DATA 4096
SCALARS CON float 1
LOOKUP_TABLE default
3.924099e-01
4.029592e-01
4.077108e-01
3.937619e-01
4.073102e-01
3.991938e-01
.
.
.

Best regards
Shahid

[Karl Ratzsch]

Am 07.08.2022 um 14:48 schrieb Shahid Maqbool:
> The output of my program has this data structure. I want to plot
> a 3D color plot; so which command I should use here?

Hmm, what you show are at least two data structures:

> # vtk DataFile Version 2.0
> time_10.vtk
> ASCII

This is the first

> DATASET STRUCTURED_GRID
> DIMENSIONS 64 64 1
> POINTS 4096 float
> 0.000000e+00 0.000000e+00 0.000000e+00
> 0.000000e+00 1.000000e+00 0.000000e+00
> 0.000000e+00 2.000000e+00 0.000000e+00
> 0.000000e+00 3.000000e+00 0.000000e+00
> 0.000000e+00 4.000000e+00 0.000000e+00
> .
> .
> .

this is the second

> POINT_DATA 4096
> SCALARS CON float 1
> LOOKUP_TABLE default
> 3.924099e-01
> 4.029592e-01
> 4.077108e-01
> 3.937619e-01
> 4.073102e-01
> 3.991938e-01

Now what is what? x, y, z? Where does the colour info come from?

And I'm sure you've checked gnuplot's demo gallery
http://gnuplot.sourceforge.net/demo_5.4/ on 3D plots and surfaces.
What is your plot supposed to look like? What can you make from the
scripts shown there, what doesn't work for you?

Best,
Karl

[Shahid Maqbool]

> Now what is what? x, y, z? Where does the colour info come from?
>
> And I'm sure you've checked gnuplot's demo gallery
> http://gnuplot.sourceforge.net/demo_5.4/ on 3D plots and surfaces.
> What is your plot supposed to look like? What can you make from the
> scripts shown there, what doesn't work for you?

The output is the vtk format. The output file is usually used for visualization
using Paraview software. I do not know how that software works and how
it reads. My interest is all about using gnuplot for this output file.

The output should look like using these commands for 2D matrix data structure:

set palette rgbformulae 33,13,10
splot 'data.dat' matrix with pm3d notitle

Basically, I have two different types of the same problem. One output is in the matrix
format in dat extension and has worked fine using above mentioned commands. The
other output is vtk format and i am trying to understand its plot using gnuplot instead
of using regular software like Paraview.

regards,
Shahid