Vtk vector field

16.12.2020 Comments

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David Doria Visualizing a vector field from a vtkImageData. I have a 2D vtkImageData with pixels that represent 2D vectors.

That is, they both seem to be aligned with the X axis, and neither of the vectors I specified are parallel to the X axis.

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Eric E. Re: Visualizing a vector field from a vtkImageData. Hey David, I just sent you a more detailed email off-list, but the problem is that you're adding 2-component Scalars to the ImageData, but then you're telling the glyph filter to use the ImageData's Vectors which haven't been assigned. I'll correct the wiki example.

VTK/Examples/Cxx/Visualization/VectorField

I assume this is because it is still "trying" to draw the rest of the vectors, but they are just invisible because they are scaled by the vector magnitude, which is zero if most of the pixels in the vtkImageData are 0,0,0 zero vectors.

Is there a way to tell the Glyph filter to ignore these zero vectors all together? I don't have time to play with it right now, but I suspect the extraction routine is expecting scalars and your "ImageScalars" is the vectors. You could try creating scalars which are the vector magnitudes and then threshold on that. Martin Waitzbauer.

vtk vector field

Paint interactively on vtkImageData. Hi I wanted to ask if its possible to implement an Interaction style, that lets you paint pixels of a give vtkImageData in one color lets say i have a 20x20 black image data, and im displaying it with a vtkImageViewer2, if thge user presses somwhere on that image, the pixel is drawn in white how could i dothat?

Re: Paint interactively on vtkImageData. I hope, vtkEdge has some paint brush widget to do thiis sort of thing. In reply to this post by Eric E.

Any thoughts on how to do this? Free forum by Nabble. Edit this page.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

I'm visualizing some fluid motion. I have a point field and each point is connected to a velocity and acceleration vector. This question is about if my code can be improved, speed-wise, as I'm trying to visualize it as an animation, which takes quite some time for larger fields, which is obvious as to how the code is set up.

There is a lot of repetitive work, that in my opinion, should be possible to perform more effectively, I just do not know how to do it. That should work, I have included some coloring and stuff as well, even though not really necessary for the example but, why not. The "interesting" thing is that I have a 3D grid, which is basically just a 2D x-z grid that is being represented in multiple y positions. Hence the question.

vtk vector field

Is there any way I can avoid this triple loop, by creating my structured grid differently? Do I have to set the points and the tuples individually? I hope the question is clear, and I will, of course, update the question if you find it unclear and if I find a different solution myself.

Learn more. Plotting vector fields efficiently, using Vtk, avoiding excessive looping Ask Question. Asked 8 months ago. Active 8 months ago. Viewed times. SetBackground 0. SetColorSpaceToDiverging ctf. AddRGBPoint 0. AddRGBPoint 1. GetColor ss lut. SetTableValue ii, cc[0], cc[1], cc[2], 1. SetRampToLinear lut. SetNumberOfComponents 3 vel. SetNumberOfComponents 3 acc. SetPoints points grid.

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SetTipResolution 16 arrow.This adds to vtkFieldData the ability to pick one of the arrays from the field as the currently active array for each attribute type.

In other words, you pick one array to be called "THE" Scalars, and then filters down the pipeline will treat that array specially. Additionally vtkDataSetAttributes provides methods that filters call to pass data through, copy data into, and interpolate from Fields.

PassData passes entire arrays from the source to the destination. Copy passes through some subset of the tuples from the source to the destination. Interpolate interpolates from the chosen tuple s in the source data, using the provided weights, to produce new tuples in the destination.

Each attribute type has pass, copy and interpolate "copy" flags that can be set in the destination to choose which attribute arrays will be transferred from the source to the destination.

Finally this class provides a mechanism to determine which attributes a group of sources have in common, and to copy tuples from a source into the destination, for only those attributes that are held by all.

Definition at line 53 of file vtkDataSetAttributes. Definition at line 62 of file vtkDataSetAttributes. Definition at line of file vtkDataSetAttributes.

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Definition at line 95 of file vtkDataSetAttributes. Reimplemented from vtkFieldData. Reimplemented in vtkCellDataand vtkPointData. Typically not called by the user use Print instead but used in the hierarchical print process to combine the output of several classes. Reimplemented from vtkObject. Reimplemented in vtkPointData. Definition at line 75 of file vtkDataSetAttributes.

If one exists, it is returned. Otherwise, the name argument is ignored, and the active attribute is returned.

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Determine whether a data array of index idx is considered a data set attribute i. Set an array to use as the given attribute type i. If this attribute was previously set to another array, that array is removed from the vtkDataSetAttributes object and the array aa is used as the attribute. Returns the index of aa within the vtkDataSetAttributes object i. If aa was already set as the given attributeType, returns the index of aa. Given an integer attribute type, this static method returns a string type for the attribute i.

For interpolation, the flag values can be as follows: 0: Do not interpolate. Obey the "copy" flags. If this is not the case, consider using the alternative forms of CopyAllocate and CopyData. If shallowCopyArrays is true, input arrays are copied to the output instead of new ones being allocated.

vtk vector field

Create a mapping between the input attributes and this object so that methods like CopyData and CopyStructuredData can be called. This method assumes that this object has the same arrays as the input and that they are ordered the same way same array indices.

Visualizing a vector field from a vtkImageData

If setSize is true, this method will set the size of the output arrays according to the output extent. This is required when CopyAllocate was used to setup output arrays. Make sure CopyAllocate has been invoked before using this method.This example shows how to create an imagedata object, associate scalar data with some points and visualize only nonzero scalar values.

This example shows how to create an imagedata object, associate scalar data with some points and visualize only nonzero scalar values A tutorial on how to setup a Windows Forms Application utilizing ActiViz. Generic ; using System.

ComponentModel ; using System. Forms ; using System. Diagnostics ; using Kitware.

VTK/Examples/Java/Visualization/VectorField

VTK ; namespace ActiViz. Show ex. Message"Exception"MessageBoxButtons. New ; magnitudeFilter. SetInputConnection image.

GetProducerPort ; magnitudeFilter. Update ; image.

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AddArray magnitudeFilter. GetScalars ; image. New ; thresholdVector. SetInput image ; thresholdVector. ThresholdByUpper 0. SetFileName "output. SetInputConnection thresholdPoints. New ; cubeSource. SetXLength 2. SetYLength 2. SetZLength 2.Definition at line 4 of file TestVectorFieldSource.

[General] Paraview Vector Field

Definition at line 8 of file TestVectorFieldSource. Reimplemented from vtkImageAlgorithm. Subclasses can reimplement this method to collect information from their inputs and set information for their outputs.

Return 1 if this class is the same type of or a subclass of the named class. Returns 0 otherwise. This method works in combination with vtkTypeMacro found in vtkSetGet.

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This is a convenience method that is implemented in many subclasses instead of RequestData. It is called by RequestData. Public Types inherited from vtkImageAlgorithm. Public Types inherited from vtkAlgorithm. Values used for setting the desired output precision for various algorithms. NewInstance const. SetBoundingBox double x0, double x1, double y0, double y1, double z0, double z1. Public Member Functions inherited from vtkImageAlgorithm.

Methods invoked by print to print information about the object including superclasses.

vtk vector field

Get the output data object for a port on this algorithm. GetOutput int. Process a request from the executive. Assign a data object as input.The code bellow shows how to load a vector field from a vtu file, where some data is stored and we are only interrested in the vector field.

Note: Please make sure that you adapt the code below to your system properties, like e. BorderLayout ; import java. File ; import java. IOException ; import java. Serializable ; import java. TimeUnit ; import javax. JFrame ; import javax.

SwingUtilities ; import vtk. SetFileName file. GetOutput ; image. SetVectors image. SetInput image ; thresholdVector. GetInformation ; thresholdVector. ThresholdByUpper threshold ; thresholdVector. GetOutput ; System. GetNumberOfPoints ; vectorGlyph.

SetInputConnection image. GetProducerPort ; vectorGlyph. SetSourceConnection arrowSource. GetOutputPort ; vectorGlyph. ScalingOn ; vectorGlyph.

OrientOn ; vectorGlyph. GetInformation ; vectorGlyph. SetScaleFactor scaleFactor ; vectorGlyph.February 10,Paraview Vector Field. Hello, I need help: with my code I generate 2 output files with the values of the U and V component of a vector field on my computational grid. How do I view the vector field given by the twe velocity components written in the output files? What type of file do I need to write for paraview to see it?

I tried to understand it from the User guide, but it is not clear for this purpose. Also, once I figured out how to view one vector field at time step t nhow can I tell Paraview to subsequently open all of the files to generate a movie? Thank you very much, best regards simone marras. I solved it already, and here the C function to write the correct format file for those who need it.

April 3,Vector plotting via vtk-file without a "Sample rectilinear grid" data set. Andreas Ruopp. Hello, I found this thread here, because I faced the same problem. This helped a lot.

But since the code example above uses a rectilinear grid, here comes my way, if you know coordinates and vector data, but the data set consists of a unstructured grid. This is a short example using three points, 3 scalar values and 3 different vector data sets for each point. Thread Tools. BB code is On. Smilies are On. Trackbacks are Off. Pingbacks are On. Refbacks are On. Forum Rules.

All times are GMT The time now is Add Thread to del. Recent Entries. Best Entries. Best Blogs. Search Blogs. User Name. Remember Me. Members List. Mark Forums Read. February 10, Paraview Vector Field. February 11, April 3, Vector plotting via vtk-file without a "Sample rectilinear grid" data set. Code: vtk DataFile Version 2.