Vtk Polygon Example

This is an example input data file that has been developed based on the structured-points illustration that I found in a tutorial powerpoint presentation posted (circa 2010) by Robert Putnam on a Boston University website; see especially slides 22-25. Python Dxf Converter. GMSH allows the user to work with a visual interface, or with script files. We can certainly use the talents of the VTK community and interested others to take this challenge on, so if you want to help please let us know. For example, traversing the cells in a dataset we would use GetCell(). For multiple data array entry, they must have the same number of grid points. Display modes. PLY files are: ASCII or binary. I have a vtkPolyData that is a contour in 2D and I need a way to get any point that is inside that contour. Now you can test out your damage numbers to see how powerful you are. VTK has been used on a large 1024-processor computer at the Los Alamos National Laboratory to process nearly a Petabyte of data. vtkPolygon is a concrete implementation of vtkCell to represent a 2D n-sided polygon. vtkStructuredGrid() grid. It can also be run as a single-computer application. The polygon is a primary two-dimensional cell. We detail how FreeFem++-cs helps users all along the development cycle. The plot produced by this example is just plotting the individual eigenvalues, not making a real bandstructure plot. • In VTK, visualizations are created by pipelines: • The renderer window displays the result on the screen and sets the resolution January 11, 2019 Introduction to VTK Render Window 10 Renderer Actor Mapper Filter(s) Source. The following are code examples for showing how to use vtk. Therefore, no translucent geometry can be inside a volume, as it would be, for example, when depicting a cut plane location with a 3D widget that represents the cutting plane as a translucent polygon. , boundary faces) are extracted. VTK_MAJOR_VERSION(). tar has been downloaded and extracted,. 0-1-2D geometry Outline Object-oriented design Visualization pipeline Data structure Rendering Examples. There are clearly concepts ready for abstraction in VTK: Polygon, Point, etc To me it's a bit suprising that the types are fixed. Hi all, I have what I think should be an extremely easy problem, but I can't figure out how to do it. For multiple data array entry, they must have the same number of grid points. Open data file File -> Open (density. I tried to use VTK library from C++. Data representation in Mayavi¶. The purpose is to render the geometry (volume) on the screen vtkCamera vtkLight vtkActor •vtkProperty •vtkMapper vtkRenderWindow •vtkTransform vtkRenderWindowInteractor vtkRenderer The Graphics Model December 13, 2005 Example Program main() { create a window; create a renderer; give the renderer to the window; create procedural geometry;. POINT_DATA 72. Examples of source objects that procedurally generate polygonal models. § VTK § Parallel (partitioned) VTK § VTK MultiBlock (MultiGroup, Hierarchical, Hierarchical Box) § Legacy VTK § Parallel (partitioned) legacy VTK § EnSight files § EnSight Master Server § Exodus § BYU § XDMF § PLOT2D § PLOT3D § SpyPlot CTH § HDF5 raw image data § DEM § VRML § PLY. com/public/1zuke5y/q3m. VTK - Simple Sphere Tutorial C++ Ashish Alone. elbow Step 2. In addition, the open clip is closed by triangulating # the resulting complex polygons. VTK consists of a C++ class library and several interpreted interface layers including Tcl/Tk, Java, and Python. In the following example a simple polygon mesh is created by manually specifying the location of each point then the connectivity between points to create a cell. For example, the scalar-based coloring can be disabled to bind a single color to the entire VTK actor representing the shape. get a point inside a vtkPolyData. Add Points and Data. vtkProcessObject. SetPoints ( points ) trianglePolyData. VTK_MAJOR_VERSION(). Supporting 3D geometry, lines, surfaces, textures, labels, shaded vertex colors, transparency and alpha-blending, the interface can be added in just a few lines of code using the vtkPDF3DExporter() class. It can also be run as a single-computer application. All of the classes listed can be used in an identical fashion. The Visualization Toolkit An Object-Oriented Approach to 3D Graphics (4th ed. misc import vtkGetDataRoot: from vtk. Download and Build Polygon. > -n -d examples/heart. get a point inside a vtkPolyData. For example, ParaView is the most popular scientific visualization application built on VTK and is highly regarded in the high-performance computing community. Let X be the boundary of a convex body in Rn+1. This interface is a terminal based text application that is very similar to the windows GUI Vtk gui examples. Upload over 60 types of data, sound, text and other files for automatic analysis and computation. a1526b6c26. In the example above, you'll end up with a single VTK file with three data arrays of the same number of grid points. vtkStructuredGrid() grid. Color mapping is a scalar visualization technique that maps scalar data to colors. In related news VTK's externally contributed wiki examples are now a remote module. org/Wiki/index. txt) or view presentation slides online. Numbering of nodes, elements and node coordinates are shown in gure 1. Update() The reader is the top level object we use to access a VTK file. Exports the boolean fused geometry of the whole configuration meshed to VTK format. For almost all cases the second approach will be much faster than the first event though VTK supports both. compute 3 top saed 0. They are extracted from open source Python projects. For example, traversing the cells in a dataset we would use GetCell(). WINDOWS USERS PLEASE NOTE: Be sure to add the VTK bin directory to your path. Plus points were python bindings, interaction capability, and that it is already packaged for both Ubuntu/Debian and Scientific Linux. The tutorial tar-gets researchers of any discipline who have 2D or 3D data and want more control over the visualization process than a turn-key system can provide. The module r3. Slice Intersects the geometry with a plane. Unlike VTK objects, one can set the properties of a tvtk object when the object is initialized by passing the properties (traits) of the object as keyword arguments at the time of class instantiation. We detail how FreeFem++-cs helps users all along the development cycle. For translucent geometry, you can obtain a correct image only if all translucent props can be sorted in depth order. Finally, the software is a true visualization system, it doesn't just let you visualize geometry. Maps are valid 3D raster maps in the current mapset search path. These examples have been subject to peer review and revision over the years. For primitive regions with sharp corners and/or edges (e. I contributed a Python version of the example. Lights, Cameras, Action : A Simple Example to Embed VTK with wxPython Posted on December 24, 2013 by sukhbinder Well matplotlib with wxPython is cool, but VTK with wxPython is awesome. You can vote up the examples you like or vote down the ones you don't like. It is actually impossible for a n00b to install VTK. Once the tarball Polygon. There are quite a few packages that can do visualization (scientific, information, medical, etc) out there. I have a vtkPolyData that is a contour in 2D and I need a way to get any point that is inside that contour. geometry, e. This guide shows steps to configure VTK in Eclipse environment. Apply Clip filter to density. You can find the answer to some Frequently Asked Questions in this page: Frequently Asked Questions. compute 3 top saed 0. ^2); // Plot scf(3); clf(3); plot(x,y,'ro-');. National Library of Medicine and available at www. h from the gcc install. vtk Special. At its core VTK is implemented as a C++ toolkit, requiring users to build applications by combining various objects into an application. vtk") reader. Download and Build ImageDataGeometryFilter. vtk Vertices-- representing points and centroids ; vtk lines-- representing lines and boundaries ; vtk polygons-- representing areas and faces ; The VTK file can be visualized with VTK Toolkit, Paraview and MayaVi. It does not include support for exact value computations, does not make extensive use of templates and does not support many of the advanced geometry algorithms in CGAL or VTK. Here are the examples of the python api vtk. VTK is an open source, permissively licensed (3-clause BSD), cross-platform toolkit for scientific data processing, visualization, and data analysis. VTK-m functionality is currently enabled for 3D rectilinear, curvilinear and unstructured grids with only hexahedral elements. When you fully upgrade the Theater, for example, you’ll unlock the Firing Range back at your base. As the geometry of the model is contained within the result file, you can plot the result without having to load any additional geometry. Any help would be much appreciated! Eye-Dome Lighting: vtkEDLShading (example request). VTK is a powerful library for analyzing and visualizing scientific data. Element curvature for an accurate representation of the geometry is supported. Both ppmtorgb3 and rgb3toppm are required. In this tutorial we introduce basic concepts behind the Visualization Toolkit (VTK). Ask Question BTW, there is a whole page with examples of VTK filters that would have given you the anwer,. Attention If areas or faces are exported, the data have to be triangulated within Paraview or MayaVi. ^2); // Plot scf(3); clf(3); plot(x,y,'ro-');. Please note that IfcOpenShell is a work in progress. This example creates a pentagon. Since I no longer have a plane, I didn't know how to apply the texture. Hi all, I have what I think should be an extremely easy problem, but I can't figure out how to do it. This game is played like the memory match card game that many children are familiar with. On 9/30/07, Janny Dong <[hidden email]> wrote: Hello, I have the latitude and longitude data for the lake areas and I put them in to a vtk file. Define the polygon with n-points ordered in the counter- clockwise direction; do not repeat the last point. The goal of the VTK examples is to illustrate specific VTK concepts in a consistent and simple format. Retrieved from "https://cmake. Python Convert Polygon To Points. In this interpretation, we can think of Points as a vertices which define the geometry of the data object. SetMapper (cutMapper) #create renderers and add actors of plane and cube ren = vtk. php?title=VTK/Examples/Cxx/GeometricObjects/Polygon&oldid=63865". Enter this code into the Maya Python script editor: import vtk c = vtk. Hi, I'm having an issue with icc on linux, it's using xmmintrin. The orientation and color of the glyph can indicate the direction and magnitude of the vector. The Visualisation Toolkit or VTK is the de facto standard API for writing visualisation programs. VTK-m supports both single block and multi-block grids. It is actually impossible for a n00b to install VTK. Search Search. 0 and OpenGL2. com/public/1zuke5y/q3m. To traverse cells with vtkPolyData we would retrieve the cell array object representing polygons (for example) and then use vtkCellArray's InitTraversal() and GetNextCell() methods. There are three polygons. * In a custom `geometry` function the vertices of a polygon are * returned as `MultiPoint` geometry, which will be used to render * the style. , scalars, vectors, normals) are extracted and appended only if all datasets have the point and/or cell attributes available. EXAMPLE Spearfish example:. They MUST be specified in counter-clockwise order. VTK consists of a C++ class library and several interpreted interface layers including Tcl/Tk, Java, and Python. VTK is an open-source, cross-platform library that provides developers with an extensive suite of software tools for 3D computer graphics, image processing,and visualization. displaying simple polygons. # Python Examples. To split a polygon, use the Cut Polygons tool, then draw a line across the polygon. a block or cylinder), wall/particle forces are computed accurately for both interior and exterior regions Vtk c sharp examples. TiGL offers query functions for the geometry structure. vtk") reader. Geometric Objects ¶. vtk Click on density. In addition, the open clip is closed by triangulating # the resulting complex polygons. In order for VTK-m filters to perform better than VTK filters the number of cells in a block must be fairly large, typically at least 1 million cells. Pointers are replaced with a VTK-specific smart pointer implementation called vtkSmartPointer. VTK has an extensive information visualization framework, has a suite of 3D interaction widgets, supports parallel processing, and integrates with various databases and GUI toolkits such as Qt and Tk. Display modes. ppt), PDF File (. VTK-m supports both single block and multi-block grids. There are also examples specifically to. The positions of the data points are deducted from the indices of array, and an uniformly-spaced data set is created. PLY files are: ASCII or binary. Once the tarball Polygon. com to purchase) VTK File Formats. VTK Is A Toolkit, Not a System History Things It Does More Things: Image-Processing Volume Rendering Combined Volume/Surface Rendering Functionality How To Use It Typical Application (in C++) Architecture VTK Architecture Tcl Interpreter Code Comparison Graphics Subsystem The VTK Graphics Subsystem Graphics Model Visualization Pipeline The. The data corresponds to gas density as fluid flows through a combustion chamber. Define the polygon with n-points ordered in the clockwise direction; do not repeat the last point. VTK Class List Here are the classes, structs, unions and interfaces with brief descriptions:. The Visualization Toolkit An Object-Oriented Approach to 3D Graphics (4th ed. VTK forms the core of the 3DSlicer biomedical computing application, and numerous research papers at IEEE Visualization and other conferences based on VTK have appeared. • In VTK, visualizations are created by pipelines: • The renderer window displays the result on the screen and sets the resolution January 11, 2019 Introduction to VTK Render Window 10 Renderer Actor Mapper Filter(s) Source. The VTK User s Guide contains everything you need to install, use, and extend VTK. These values are the ones that are interpolated by VTK when we generate the image. vtkExtractUnstructuredGrid - extract subset of unstructured grid geometry. This document presents the PLY polygon file format, a format for storing graphical objects that are described as a collection of polygons. An example XML file is given below. For almost all cases the second approach will be much faster than the first event though VTK supports both. Some illustrating examples are given for better understanding. Do not repeat the last point. 2 At a Glance n The core of VTK is written entirely in C++ n Contains 600 existing classes with 325K lines of code n VTK will compile and run on Windows 98/NT, SGI, Linux, Sun, HP, etc. The polygon is a primary two-dimensional cell. You can find the answer to some Frequently Asked Questions in this page: Frequently Asked Questions. js aims to be a subset of VTK and provide 3D rendering using WebGL for both geometry and volume rendering. The image is # extracted as a set of polygons (vtkImageDataGeometryFilter). This example uses three textures, each used to texture a different polygon zone. Open data file File -> Open (density. Rob suggested trying to revert building cell locators in vtkm_cont library. Geometry module preferences are described in the Geometry preferences section of SALOME Geometry Help. vtk Click on density. You can then convert your simple ASCII *. ifc extension are supported (technically known as. That is, given polygons P, Q, I wish to find polygon T which is contained in P and in Q, and I wish T to be maximal among all possible polygons. No additional CPACS relevant information are computed. VTK file represented as a Graphics3D object "GraphicsComplex" VTK file as a GraphicsComplex object "LineData" the line elements of a VTK file in indexed form, with integer indices referencing the vertices as given by "VertexData" "LineObjects" list of Line primitives given in absolute coordinates "PolygonData" the polygon elements in indexed form. The polygon normal is implicitly defined by a counterclockwise ordering of its points using the right-hand rule. GeneratePolygonOff() polygonSource. For example, if you'd like to draw a mesh with some edges a different color, and the edges lie on the mesh, this feature can be useful to get nice looking lines. Complex postprocessing effects. , vtkStructuredPointsReader to read a volumetric image from a. Set the screen up so that it looks like the one. After carefully reanalyzing the information contained in the input data file I realized that, given the definitions of the six POLYGONS provided by the input data file (as copied from the simple "Cube example" in the VTK User's Guide), VTK's default assignment of unit vector normals should be as follows:. The Python binding of vtk library seems missing a very important function for users to access cells/polygons in Python, as mentioned in a VTK mailing list post back to 2002 and another post in 2011. Other polygonal source objects are available; check subclasses of vtkPolyDataAlgorithm. All objects will appear gray by default. All 2D faces that are used by only one 3D cell (i. vtk -m Outline -m ContourGridPlane This command loads a VTK data file called heart. It is now regression tested with every VTK commit for starters. points (set) Set the polygon's points. PLY files are: ASCII or binary. The purpose is to render the geometry (volume) on the screen vtkCamera vtkLight vtkActor •vtkProperty •vtkMapper vtkRenderWindow •vtkTransform vtkRenderWindowInteractor vtkRenderer The Graphics Model December 13, 2005 Example Program main() { create a window; create a renderer; give the renderer to the window; create procedural geometry;. Because Qt4 is not actively developed (as documented here support ended), we need to work toward supporting Qt5. It has a client-server architecture to facilitate remote visualization of datasets, and generates level of detail (LOD) models to maintain interactive frame rates for large datasets. Is there any example of using VTK just to plot simple 3D contour graph like the one shown below? The official VTK Wiki has dozens of code examples, but I cannot find any useful example of this simple task. this type of mesh supports only VERTICES, LINES, and POLYGONS -- not 3D cells A one-cell 2D rectilinear mesh # vtk DataFile Version 3. VTK: The Visualization Toolkit Part I: Overview and object models March 28, 2001 What is VTK? Volume Rendering Software Hardware Data Isosurface Extraction Vector Field Visualization What is VTK? n An open source, freely available software system for 3D graphics, image processing, and visualization. National Library of Medicine and available at www. and its CMakeLists. VTK: The Visualization Toolkit Qaiser Chaudry Georgia Institute of Technology June 28, 2006 Visualization What is VTK? An open source, freely available software system for 3D graphics, image processing, and visualization. Pentagon Hexagon Octagon Trapezoid Parallelogram Square Rectangle Rhombus Circle Pentagon Hexagon Octagon. extract geometry from data (or convert data to polygonal type) vtkGeometryFilter is a general-purpose filter to extract geometry (and associated data) from any type of dataset. Is interaction between Polygon Offset and Line Offset parameters allowed?. How to Find the Perimeter of a Polygon. Scribd is the world's largest social reading and publishing site. vtkRenderer ren. Run the utility foamToVTK on the case so that we get VTK-readable files. It would be appreciated if there are any Python VTK experts who could convert any of the c++ examples to Python!. here is the sample code of drawing a polygon;. Thank goodness for Wikipedia. The following is an example of 3D vector surfaces in GRASS ASCII vector format. Slice Intersects the geometry with a plane. Here are the examples of the python api vtk. tcl, specifies how to visualize a collection of polygons as described by a vtk Polydata file. Ask Question This obviously cannot go in a PolyData VTK file (see the second line of your example XML file). saed The Nevery , Nrepeat , and Nfreq arguments specify on what timesteps the input values will be used in order to contribute to the average. The Visualization Toolkit (VTK) is an open-source, freely available software system for 3D computer graphics, image processing and visualization. vtkPoints(). A thorough understanding of OO concepts is necessary to realize the full functionality of VTK. When you fully upgrade the Theater, for example, you’ll unlock the Firing Range back at your base. Please use the the search function to find the examples you need. We also have some of our own VTK example programs associated with the live version of a VTK tutorial we have offered in the past (the PowerPoint slides for this are also available). Procedural geometry. The image is # extracted as a set of polygons (vtkImageDataGeometryFilter). The code to the right is common throughout the four examples. The VulkanSceneGraph project is now underway, combining Vulkan and C++17 to create a next-gen scene graph. For example cs = tvtk. For the proposes of the tutorial we can get by with some basic concepts. The vtkDICOMWriter takes a vtkImageData object as input, and writes a series of DICOM image files to disk. For translucent geometry, you can obtain a correct image only if all translucent props can be sorted in depth order. vtk Special. This library is not a heavy duty computational geometry library intended to replace CGAL. but in most cases it is a non-planar polygon. 3d Reconstruction Library. #include 如何读写. Almost all geometry module functionalities are accessible via Geometry module Python Interface. Kind regards, Terry. In this interpretation, we can think of Points as a vertices which define the geometry of the data object. Contact Kitware www. Start Paraview, load VTK data, and choose the correct readers : for example "Legacy VTK file"it is fairly intuitive to use. SetScalars(Efield) filter = vtk. com Thanks [General] vtk example file -- CFD Online Discussion Forums. This application paper presents a novel framework based on topological data analysis for the automatic evaluation and ranking of viscous finger simulation runs in an ens. If you have installed VTK over your package manager, CMake is able to find the required files. AddActor( outlineActor ). A multimodal virtual reality interface for 3D interaction with VTK that represents an e vent from the tracker in the dominant hand (this e vent re- places the MouseMo veEv ent used in 2D VTK) and. The next example is a volume of dimension 3 × 4 × 5. See VTK Examples web page for more information. org/Wiki/index. This will resolve the VTK dll's at run time. How to Create Visualization Applications with VTK Attribute Data Example. Note Vtk c sharp examples. Triangle Quad Polygon Tet Hexa Prism abstract. To traverse cells with vtkPolyData we would retrieve the cell array object representing polygons (for example) and then use vtkCellArray's InitTraversal() and GetNextCell() methods. To traverse cells with vtkPolyData we would retrieve the cell array object representing polygons (for example) and then use vtkCellArray's InitTraversal() and GetNextCell() methods. tar has been downloaded and extracted,. Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. This will resolve the VTK dll's at run time. For the VTK color table file, "render mode" field is not need for polygon rendering. 04; Part-2: Install and Configure VTK 8. The references to the VTK pipeline can be deleted along // the way as the objects themselves will stick around until the // Interactor associated with the Fl_VTK_Window is. The examples we will be using were originally developed for the 2008 Workshop on Scientific Visualization and are based upon the example programs and data from Kitware. GetOutput() from importvtk import importvtk # Three ways to import the polydata. lisp, into a Maxima session. Otherwise you have to set VTK_DIR manually. vtkPolyDataNormals taken from open source projects. pointArray (get) Get the array of triangles that triangulate the polygon. Let X be the boundary of a convex body in Rn+1. Among them: Procedural and keyframe-based animation. Supporting 3D geometry, lines, surfaces, textures, labels, shaded vertex colors, transparency and alpha-blending, the interface can be added in just a few lines of code using the vtkPDF3DExporter() class. vtkUnstructuredGridGeometryFilter() Examples. The polygons cannot have any internal holes, and cannot self-intersect. For this simple system, the exact result is known analytically: the demag field vector has to be equal to minus one-third of the magnetisation vector, everywhere. The Visualization Toolkit (VTK) is an open-source, freely available software system for 3D computer graphics, image processing and visualization. The theory behind the geometry solver is described in a paper submitted to "The First World Conference on 3D Fabrics and Their Applications" held in Manchester on the 10-11th of April 2008 titled "Prediction of textile geometry using strain energy minimisation". vtk Vertices-- representing points and centroids ; vtk lines-- representing lines and boundaries ; vtk polygons-- representing areas and faces ; The VTK file can be visualized with VTK Toolkit, Paraview and MayaVi. Mirror of Visualization Toolkit repository. Welcome to Verge3D Code Examples. National Library of Medicine and available at www. saed The Nevery , Nrepeat , and Nfreq arguments specify on what timesteps the input values will be used in order to contribute to the average. Similarly because VTK7 is not actively developed, we need to work toward supporting VTK8 and the OpenGL2 rendering backend. get a point inside a vtkPolyData. vtkGeometryFilter() Examples. Examples from those sections are used in the following one, which describes how to use programmable filters in Tcl with methods written in C++. The dataset contains ”attribute data”, which is VTK speak for ”values defined at point locations”. The Javascript code for the interactive visualization is based on the ThreeJS library. VTK just has a general list of texture points, but as it doesn’t know which coordinates match to which texture, even by setting multiple textures to the actor, it behaves by default, i. The XML formats support random access, parallel I/O, and portable data com-pression and are preferred to the serial VTK file formats whenever possible. m: EX_NAVIERSTOKES2 2D Example for incompressible flow in a square cavity ex_navierstokes3. This will resolve the VTK dll's at run time. This file starts with a specification of a series of point coordinates, implicitly numbered as 0,1,2,. This library is not a heavy duty computational geometry library intended to replace CGAL. Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. 3D geometry is transformed. Understandably so, it is not simple to architecturally achieve this given the necessity for various rendering passes and resource sharing across different mappers. 0 and OpenGL2. Especially the Tcl-examples are important for starting vtk users to learn how to visualize their data. However, I'm not sure how to constrain the surface plot my vtkDelaunay2D comes up with to a "positive" shape…essentially making sure the generated mesh doesn't extend past the edges of the blocky cross section of my frame (as shown above). Contact Kitware www. SCIENTIFIC DATA ANALYSIS AND VISUALIZATION WITH PYTHON, VTK, AND PARAVIEW. Download and Build ImageDataGeometryFilter. m: EX_NAVIERSTOKES2 2D Example for incompressible flow in a square cavity ex_navierstokes3. Size represents the frequency – The root is a user-specified word or phrase of interest – The branches represent the various context 35 Hongfeng Yu – The root is a user. Notice: Undefined index: HTTP_REFERER in /home/forge/shigerukawai. Add Points and Data. Introduction to Python and VTK or vtkSTLReader to load a 3D polygon model from a. The first part is the file version and identifier. Once the tarball Triangle. vtkPolyData # Add the geometry and topology to the polydata trianglePolyData. I got it to work though - here is an example of how to add texture coordinates to a polydata and then texture map a quad:. Some have been there since the inception of the toolkit. The Visualisation Toolkit or VTK is the de facto standard API for writing visualisation programs. An example of VTK visualization is shown inFig. In particular, vtkPlotSurface / vtkChartXYZ seemed to be just what I wanted. Netscape) you can start a vtk application by clicking an image. The polygons cannot have any internal holes, and cannot self-intersect. Hi, I'm having an issue with icc on linux, it's using xmmintrin. vtkProcessObject. This part contains the single line: # vtk DataFile Version x. I'm modifying this example - instead of different geometry I need to render the same geometry in multiple windows. Part-4: Compile pcl with vtk qt5 support from source on windows. VTK is an object system and so requires some understanding of Object Oriented programming. The plane goes through two vertices of the polygon.