Vtk polygon example

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Vtk polygon example

I am using vtk python to extrude a polygon, and then write out the extrusion to an stl file. I suspect this is due to the normal defined by the anti-clockwise ordering of the points describing the base polygon. Can anyone tell me what I should be doing differently? The stl file produced is as follows.

vtk polygon example

However, the normals of the 2 facets that describe the base of the cube third and fourth from the bottom point in the 0,0,1 direction, i. Another workaround is to append vtkPolyDataNormals filter. This can enforce consistent polygon ordering as an option. Thanks, guys. Interestingly, however, I found that simply appending a vtkPolyDataNormals filter to the vtkLinearExtrusionFilter output did not seem to have any effect for example, normals.

I worked around the problem by appending a vtkTriangleFilter to the extrusion, and then appending the vtkPolyDataNormals filter to that, which then seemed to have the desired effect. SetNumberOfIds len extrusion['base'] for i in range 0, len extrusion['base'] : polygon. SetPoints points polyData. SetInputData polyData extrude. SetVector 0, 0, extrusion['height'] extrude. SetFileName '.

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SetInputConnection extrude. GetOutputPort stlWriter. Thank you. Maybe try using the vtkCubeSource which will precompute the proper normals for you?

SetCenter 0. SetXLength 1. SetYLength 1. SetZLength 1. SetInputConnection src. Kenichiro-Yoshimi Kenichiro Yoshimi June 21,am 3. GetOutputPort normals. ComputeCellNormalsOn normals. FlipNormalsOn normals. SetInputConnection normals.

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SetInputData extrude.These are fully independent, compilable examples. There is significant overlap in the examples, but they are each intended to illustrate a different concept and be fully stand alone compilable. All of the classes listed can be used in an identical fashion.

Here is an overview of these data structures: [1]. Image data can represent at typical 2D image, but also, a 3D volume. RenderMan is a high quality rendering system create by Pixar. In the spring ofPixar released a non-commercial version of its RenderMan products.

Page actions Page Discussion More Tools. Personal tools Log in. This example reads ascii files where each line consists of points with its position x,y,z and optionally one scalar or binary files in RAW 3d file format. This class tries to find an appropriate reader. It is very convenient to use this when you don't know what kind of file to expect.

Here is a good explanation of what is going on. This uses a Delaunay triangulation to compute a volume. This gives more of an "is inside convex hull" effect than an "is inside object". Set the color of each point of a triangle. You will be able to interpolate the colors across the triangle. Clip a vtkRectilinearGrid with arbitrary polydata. In this example, use a vtkConeSource to generate polydata to slice the grid, resulting in an unstructured grid.

Contrast this with the next example. Contrast this with the previous example.The Visualization ToolKit VTK is an open source, freely available software system for 3D computer graphics, image processing, and visualization. VTK supports a wide variety of visualization algorithms including scalar, vector, tensor, texture, and volumetric methods; and advanced modeling techniques such as implicit modeling, polygon reduction, mesh smoothing, cutting, contouring, and Delaunay triangulation.

As Tcl is one of the easiest languages with which to learn VTK, this tutorial is organized as a set of Tcl code examples with explanations. It is assumed that the student is familiar with basic Unix commands, the Tcl interpreter, and the use of an editor. The examples we will be using were originally developed for the Workshop on Scientific Visualization and are based upon the example programs and data from Kitware.

The workshop examples are available for download here: Tar file of the VTK workshop examples. See VTK Examples web page for more information.

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This tutorial assumes that you have downloaded and untared the workshop examples file. You should now have a materials directory with both a Data and a Demos subdirectory. For example:. The most effective way for you to go through this tutorial is by running and modifying the appropriate workshop examples as we discuss them.

Note : in many of the example files, some code lines are commented out. These lines represent alternative options for a particular function in the code. You should experiment with the code by changing which option is executed i. It can also be helpful for you to browse the VTK documentation for the specific classes we discuss links are provided.

This will tell you on what machines VTK is available, how to set up your environment, how to set your display, and where the documentation is. This insures cross-platform portability and creates a device independent graphics layer.

In the graphics model class names were adapted from the movie-making industry. Lights, cameras, actors, and props are all used to create a scene. In order to visualize your data, you will need to open a window and create a renderer. The vtkRenderWindow is a container class for vtkRenderer objects. Within a VTK application you can have multiple windows and multiple renderers tiled within each window. Here is example Tcl code to create a simple window and renderer:.

Now that we know how to create a window, we can create an actor for our scene. To start we will need some data. We will use an instance of vtkConeSource to generate polygonal data for a cone. We will then use an instance of vtkPolyDataMapper to take the polygonal data from the vtkConeSource and create a rendering for the renderer. Here is example Tcl code to create a simple cone and a window and renderer:. In order to interact with the scene using the mouse we will use an instance of vtkRenderWindowInteractor.

The left mouse button controls rotation, the middle mouse button controls panning, and the right mouse button controls zooming. Here is code to create a cone within an interactive window and renderer:. The visualization pipeline is responsible for constructing the geometric representation that is then rendered by the graphics pipeline. In other words the visualization pipeline transforms informational data into graphical data which is then transformed into images by the graphics pipeline.

VTK uses a data flow approach to transform informational data into graphical data. There are two basic types of objects involved:.Please see this page to learn how to setup your environment to use VTK in Python. Page actions Page Discussion More Tools. Personal tools Log in. This example draws a Koch snowflake fractal using recursive functions and some of the convenient tools in the toolkit.

In this example, use a vtkConeSource to generate polydata to slice the grid, resulting in an unstructured grid. Demonstrates the coloring of a surface by partitioning the elevation into bands and using arrows to display the normals on the surface. Demonstrates the coloring of a surface by partitioning the gaussian curvature of a surface into bands and using arrows to display the normals on the surface. A function to simplify the summing of images, where you can pass a list of images and weights.

Draws two cubes. One of them can be clicked to be rotated, and will rotate the second one. The second one has annotations on it, and can also be moved. The ScalarBarWidget displays a scalar bar that is movable and changes orientation automatically when close to the borders of the image.

vtk polygon example

It needs a ScalarBarActor. This 3D widget defines a region of interest that is represented by an arbitrarily oriented hexahedron with interior face angles of 90 degrees orthogonal faces. The object creates 7 handles that can be moused on and manipulated.

vtk polygon example

A utility class for vtkLookupTable allowing you to output the table contents or to compare tables. Remote Renderer. Embed in PyQt 1. Embed in PyQt 2.These are fully independent, compilable examples. There is significant overlap in the examples, but they are each intended to illustrate a different concept and be fully stand alone compilable. This table shows the VTK classes covered by the examples.

This table shows VTK classes that do not have an example.

VTK/Examples/CSharp/GeometricObjects/PolygonIntersection

Please add examples in your area of expertise! These examples demonstrate how to create an display one of the many vtkParametric objects. All of the classes listed can be used in an identical fashion.

Here is an overview of these data structures. Image data can represent at typical 2D image, but also, a 3D volume. This section includes vtkUnstructuredGrid. See this tutorial for a brief explanation of the VTK terminology of mappers, actors, etc.

Click here for a tutorial on how to setup Qt.

Types of Quadrilaterals and Other Polygons

If you have any trouble or errors with the following examples, please troubleshoot using these instructions. RenderMan is a high quality rendering system created by Pixar. In the spring ofPixar released a non-commercial version of its RenderMan products. Remote modules are user contributed code that is not distributed with VTK. Once enabled, a remote module is treated like any other VTK module.

Each of the remote module examples describes how to enable the example. More information about remote modules is here. Info This table shows the VTK classes covered by the examples.

Info This table shows VTK classes that do not have an example. A hello world example python. DistanceBetweenPoints python. This example reads ASCII files where each line consists of points with its position x,y,z and optionally one scalar or binary files in RAW 3d file format. ReadExodusData python. ReadImageData python. ReadUnstructuredGrid python. Write a. VTP is a "PolyData". This format allows for the most complex geometric objects to be stored.

ReadLegacyUnstructuredGrid python.

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WriteLegacyLinearCells python. This class tries to find an appropriate reader.These are the examples of the mlab plotting functions. They are copied out here for convenience. Please refer to the corresponding section of the user guide for more information 3D Plotting functions for numpy arrays. Examples showing how to use the interactive features of Mayavi, either via the mayavi2 application, or via specially-crafted dialogs and applications.

Data visualization using the core Mayavi API, object-oriented, and with more fine control than mlab. Julia set example. If you publish articles using Mayavi, please cite Mayavi. We need these citations to justify time and resources on the software. Navigation index next previous mayavi 4. Quick search.

VTK/Examples/CSharp/GeometricObjects/PolygonIntersection

Google Search only search Mayavi documentation. Citing Mayavi If you publish articles using Mayavi, please cite Mayavi. Last updated on Jul 21, Created using Sphinx 1. Julia set example An example showing the Julia set displayed as a z-warped surface. Boy example A script to generate the Mayavi logo: a Boy surface. Custom colormap example An example showing how a custom colormap or look up table can be used for a given object. Surface from irregular data example An example which shows how to plot a surface from data acquired irregularly.

Spherical harmonics example Plot spherical harmonics on the surface of the sphere, as well as a 3D polar plot.

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Lorenz example An example displaying the trajectories for the Lorenz system of equations along with the z-nullcline. Julia set decimation example The Julia set, but with a decimated mesh: unecessary triangles due to the initial grid and not matching the geometry of the Julia set are removed.

Simple structured grid example An example creating a structured grid data set from numpy arrays using TVTK and visualizing it using mlab. Atomic orbital example An example showing the norm and phase of an atomic orbital: isosurfaces of the norm, with colors displaying the phase. Chemistry example In this example, we display the H2O molecule, and use volume rendering to display the electron localization function. Wigner example An example in which 3 functions of x and y are displayed with a surf plot, while the z scaling is kept constant, to allow comparison between them.

Canyon decimation example Use the greedy-terrain-decimator to display a decimated terrain view.The information in this e-mail is intended only for the person to whom it is addressed. If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.

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Search everywhere only in this topic. Advanced Search. Classic List Threaded. Chen, Lifan. How to select a polygon region in a vtkImageData. Hey all. I am working on a project that requires to manually extract a region from a 3D vtkImageData.

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David Gobbi. Re: How to select a polygon region in a vtkImageData. Hi Fantasy. Hey David. I use stencil and it works well, however, the dimension index of the output of stencil remain unchanged which I supposed to change according to the size of region I choose and there is a gray part around the region I choose when displaying in the 3-D viewer.

Do you what is the problem? VTK has "stencil" operations for extracting regions from vtkImageData. For example:. However, I only need the region that has been extracted from the original image data. Is there any method to minimize the size of the output to the extracted region?

Search everywhere only in this topic Advanced Search How to select a polygon region in a vtkImageData. Hey all, I am working on a project that requires to manually extract a region from a 3D vtkImageData.

Is there any method to solve this problem? Thanks, Fantasy Chen The information in this e-mail is intended only for the person to whom it is addressed. Hey David, I use stencil and it works well, however, the dimension index of the output of stencil remain unchanged which I supposed to change according to the size of region I choose and there is a gray part around the region I choose when displaying in the 3-D viewer.

Hi Fantasy, I don't know what you mean by "dimension index". Free forum by Nabble. Edit this page.


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