Questions tagged [visualization]

Questions relating to graphing and displaying numerical data

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4
votes
2answers
8k views

Visualising Maxwell's equations using MATLAB

I asked this question to help me understand what is going on in one of Maxwell's equations. I am happy with following through the maths on paper now, but would like to use MATLAB to take it one step ...
2
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1answer
302 views

15 noded triangular elements in paraview

I am modelling a soil medium in plane strain and would like to determine if paraview supports the 15-noded triangular element as shown on this link. On the documentation I am only seeing elements up ...
1
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1answer
129 views

VTK: Missing Streamlines due to error in Runge-Kutta method?

We are using Kitware VTK to visualize our models. When we display streamlines, it sometimes happens that a single streamline is left out. This can be especially seen when duplicating a model several ...
0
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1answer
68 views

Dynamic Analysis and Visualization of Laminate Mindlin Plate

I am trying to make the jump from a FEM plot of a static load applied to Mindlin laminate plate to a surface visualization of various Mode Shapes of the Laminate Plate. For that, I understand that the ...
4
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2answers
12k views

plotting a 2D animated data surface on MatPlotLib

I'm trying to get an animated 2D data surface on MatPlotLib. After a bit of search on the internet, i've found an example that almost works: ...
1
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1answer
3k views

matlab set center of output figure to [0 0 0]

I have a few set of data of three dimensional matrices, n x 3 with x, y and z coordinates. I viewed the matrices in the figure window. ...
4
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2answers
257 views

Alternatives to Mathematica

looking to introduce a mathematics program in my work, I would have 2 uses: In a classroom (high school level), providing good visualisation of physics ideas, and making my lecture more interactive. ...
1
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1answer
505 views

2d slice cut of tetrahedral mesh in tecplot 360 ex [closed]

I have made a 2d slice cut of a 3 dimension figure. When I select "mesh" to display the mesh on the slice, tecplot seems to connect the vertices in a strange way (it seems like two 2d meshes are ...
1
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1answer
305 views

Matlab: Creating a matrix that represents a colored, sinusoidally-modulated grating

I would like to draw a texture (in Matlab - Psychtoolbox) which is composed of a sinusoidally-modulated isoluminant (magenta & cyan) grating. I do have the RGB matrices of the two phases (for ...
2
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1answer
4k views

Plot a surface from data sets in MATLAB

I tried to plot a surface in MATLAB but, since it is the first time I had to do something like this, I need a confirmation on the process I followed because it is important for my project to plot the ...
4
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1answer
2k views

Unwrap cylinder to plane in Paraview

I want to extract the data from the boundary surface of a cylinder (in a .vtu file) and plot it onto a plane, where the coordinates are theta (rotation angle) and Z(...
10
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1answer
1k views

Visualization of quadtree & octree grids

So-called quadtree and octree grids are quite attractive for applications requiring adaptive mesh refinement. They are for example used in Gerris and Paramesh. Is anyone aware of a good file format ...
2
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1answer
208 views

Creating a 3D spatial density map from simulation results

I want so visualize the spatial density for my simulation. The result of my simulation is a (time-dependent) system of large number (~100k) of moving particles in a confined space. Each particle has ...
3
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2answers
353 views

Can mainstream 3D software be a useful alternative in scientific visualisation?

I hope this is not a vague question. I would like to know if any researchers and students in this community have used or considered using 3D graphics software (such as Blender) or a game engine to ...
9
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3answers
1k views

Second order tensor field visualization software

Is there an overview available over tensor visualization software? My personal preference is: A software which is free, well documented, and offers visualization techniques for different physical ...
0
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3answers
704 views

How to plot a price level matrix in Matlab?

I have a matrix P of m rows and n columns. P(i,j) contains the price of occupying position i at time j. I want to plot this in Matlab but in a way to get some kind of density plot with different price ...
1
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1answer
52 views

What are the computational solutions for periodic visualization of simulation?

I like to set my scientific simulation programs to generate a picture after a certain number of iterations, such that I can follow what is happening and maybe cancel the simulation before the ...
25
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6answers
7k views

Visualizing very large link graphs

I am looking for a tool to visualize very large directional link graphs. I currently have ~2million nodes with ~10million edges. I have tried a few different things, but most take hours to even do ...
1
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0answers
576 views

best package choice for visualizing agent based model simulations in python

This is a visualization/programming design problem. I am working on building a geospatial agent based model, meaning that there are multiple agents interacting within some particular spatial container....
0
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3answers
93 views

Software recommendation for plotting data from lab tests

I have several files of data created by LabView of hydraulic pressure testing over the course of a few days. This data is mostly time with various pressure and temperature measurements. Can you ...
1
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1answer
630 views

Is there a single C++ IDE packed with necessary scientific libraries for computing purpose?

I am basically looking for a good open source C++ IDE with scientific and visualization libraries built in. Can any one suggest few projects?
2
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2answers
89 views

What's the role of visualization?

I'm just starting at scientific computing and I'm seeing that results can be generated merely by plotting the variables. Of course more variables lead to more axes/dimensions so e.g. a three variable ...
7
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2answers
4k views

Is there a fast way to compute histograms for high-dimensional large datasets?

Currently the way I compute histograms for data is by generating grid in $N$ dimensions (where $N$ is the dimension of the data) and searching through the $M$ data points in each dimension to see in ...
3
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0answers
354 views

C60 orbital calculation

I am currently trying to reproduce the results published by Hands et al.1 using MATLAB. They calculated the bases of the C60 wave functions of HOMO, LUMO and LUMO+1. I did the following: I ...
1
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1answer
1k views

Paraview: Multiple csv files to time series

I have multiple CSV files with point-coordinates and, possibly, multiple data values attached to them, i.e., the rows look like x y z data1 data2 ... Is there ...
2
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2answers
575 views

Should a colorbar have constant values throughout a simulation?

The default option for matplotlib's pcolormesh (also true for VisIt and I think also true for Matlab) is to allow the maximum and minimum of a colorbar vary. Which ...
3
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0answers
37 views

Is there a library which allows for converting 4D implicit surfaces to simplexes?

I have a 4D surface in the form of the spin quadric. I would like to display this surface onto the screen. One of the method which I would like to use to present surface onto the screen is projection. ...
6
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2answers
2k views

How can one produce a proper streamline plot?

I recently had trouble producing a proper streamline plot in Mathematica, and apparently the problem is a good bit harder than I appreciated. I would like to know if there exist general algorithms to ...
5
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2answers
140 views

Which visualisation software for a layered graph?

I have produced a CSV file in the following format: ...
1
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0answers
178 views

Visualization of solution for a MAC grid

So I implemented the projection method as in Chorin (1969) for the solution of the Navier-Stokes Equations with the Boussinesq Approximation, using a 2nd Order accurate FD scheme. The primitive ...
0
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0answers
411 views

3D animation of a vector field (ParaView) [duplicate]

I am trying to create an animation of a 3d vector field in ParaView. All my data is in three matrices (201 x 201 x 201) corresponding to vectors components in x,y,z directions. And it's calculated in ...
1
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2answers
73 views

Help on writing sofware: general guidelines, in particular separation of computation and visualization

Although I already did some work in the intersection of theory and simulation I'm still very new to this field and I need some guidance. If anybody can give some recommendations for introductory ...
0
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1answer
85 views

Rendering Huge Data with Renderman Interface Bytestream

I have tones of geometrical objects (spheres, meshes) I want to render: One way would be to first write a .rib file which could be certainly done and then push that file to a renderman compliant ...
0
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2answers
692 views

How-to: Epic visualizations of 3D fractals?

I have seen videos like this before in the past of things like "3D Mandlebulbs" and similar fractal sets, but can anyone tell me what sorts of programs are actually used create these visualizations? ...
1
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1answer
615 views

Visualizing the difference of two sets of VTK files

I have two sets of 300 VTK files and I want to get a graph comparing the average difference of the two sets. All files have a structured grid containing a scalar value named phi. At the end, I need a ...
1
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1answer
747 views

VTK File: How do I save data on a cell face?

I am writing a program that creates a vtk file with a Rectilinear Grid. I am able to save data to each one of the cells using CELL_DATA, but now, I need to save data to each one of the cell faces (x6)....
6
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2answers
4k views

Using numpy arrays in Paraview programmable filter

How can I access a field in Paraview's programmable filter as a numpy array? I want to: Import an existing field as a numpy array Create a similar array for output Register it as a new field for ...
4
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2answers
2k views

VTK file format to image file

Is there a way to convert vtk file without visualizing into a image file such as png in the bash terminal itself? I have found that for the vtk files that I visualize to take longer time than its ...
15
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4answers
14k views

How do I calculate the numerical difference between two fields stored in two different VTK files with the same structure?

Suppose I have two VTK files, both in structured grid format. The structured grids are the same (they have the same list of points, in the same order), and there is a field, call it "Phi", in each VTK ...
1
vote
1answer
3k views

WRL and VRML to Matplotlib/Numpy

I would like to import (or parse ??) a WRL/VRML file format in python in order to work the data with Matplotlib. Is there any way of converting this file format into plottable numpy arrays ? I ...
7
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3answers
9k views

Python scripting in Paraview

I've been using the basic visualization features of Paraview. Now, I want to go further by writing python macros to handle some specific tasks. My question for the advanced users: Are there any ...
1
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0answers
227 views

Printing a plot in Octave-3.8.1 breaks LaTeX labels [closed]

Since upgrading to Octave 3.8 I have been unable to export plots with LaTeX labels. When the figure is displayed the labels render fine but when I try to export the figure using the ...
8
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4answers
582 views

Should I use a database to handle large amounts of results?

Background: I am currently running a large amount parameter variation experiments. They are being run in Python 2.6+, using numpy. These experiments are going to take about 2 weeks to run. Roughly I ...
0
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1answer
95 views

Plotting 3d dimensional histogarm in a spatial grid

Is there any tool to plot 3d dimensional histogram in a spatial grid? Preferably are there any filters or operators in Paraview or Visit for this?
35
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6answers
3k views

What attributes make a figure “professional-quality”?

I've heard people say that plots produced by ORIGIN tend to look polished and "professional," whereas plots produced by Mathematica do not. However, most plot-creation programs are quite configurable ...
1
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2answers
2k views

Converting VTK point dataset of scalar values to a smooth surface

Does Paraview or Visit have any filters to draw a smooth surface for a set of points?
1
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1answer
60 views

Visualizing certain sets

I'm not sure if this question is appropriate for this site, so I appologize in advance if it's not. For the purpose of a certain project I am working on, I would like to have the following sets ...
4
votes
2answers
589 views

High quality molecular renderings

I would like to use a high-quality renderer (physically based path-tracing or MLT) to generate some images of molecular systems I have. Right now I'm just using some of the simple renderers in VMD, ...
2
votes
2answers
2k views

visualization of 3D probability flow

I have a master equation for $P(N_A^+,N_B^+,N_C^+,t)$, with $N_A^+,N_B^+,N_C^+$ all discrete. The numerical integration is done by this Matlab program using Euler's method. Despite the crude Euler's ...
0
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1answer
851 views

Setting background image with respect to a point in Paraview

How to set image with respect to a point in Paraview? I have a vtk file within a rectangular domain starting with the lower left point -1842,10000, I want to set a background image whose lower left ...