I want to put a spline widget on a plane and move the control points to show scalar on different position dynamically. It will be convenient for user to check the change of scalar on the model. It’s easy to use vtkStructuredGrid and vtkGeometryFilter to create a plane with color Read more…
A few macros we need in our project are in the following code snippet. They can make our project cleaner. #define vtkPtr( var, className ) vtkSmartPointer<className> var = \ vtkSmartPointer<className>::New() #define CPP_SET_MACRO(name,type) \ void Set##name(type _arg) \ { \ if (this->name != _arg) \ { \ this->name = _arg; \ Read more…
VTK provides some convenient algorithms to help us display the whole digital elevation model (DEM). My university major is Geometry Information Science, it’s so exciting for me to write an article about DEM since I became a professional software develop programmer. In the following section, I will show how to Read more…
vtkImageActor vtkImageActor is used to display picture in 3D render window. By changing the interactor to a vtkInteractorStyleImage you can limit rotations so that user can operate the 3D render window as a 2D image viewer. python code: import vtk fileName = “/Users/weiyang/Desktop/Untitled.png” reader = vtk.vtkPNGReader() reader.SetFileName( fileName ) reader.Update() Read more…
vtkBoxWidget2 shows a bounding box outline, the face of the box can be picked and moved to scale the object inside the bounding box. After rotating, translating, and scaling, we can ensure the inside item change shape and position with the box widget. It sounds so good that user can Read more…
The article shows a few kinds of widgets which are used to measure the distance between two points, angle between two rays, and the bidimensional length of an object. Distance Measure The Distance On 2D Model We need vtkDistanceWidget, vtkDistanceRepresentation2D and vtkPointHandleRepresentation2D to help us to calculate the distance between Read more…
We want to put points on the three-dimensional model sometimes, it’s better if these control points can be moved around the item and project generates a new interpolation line dynamically. VTK provides a tool for us to do it easily. The following content shows two scenarios about point placer, both Read more…
The article shows how to create a simple vtk render window project. We need cmake and the visualization toolkit installed. This example uses C plus plus programming language to create and show a cone in the 3D world. CMakeLists.txt cmake_minimum_required(VERSION 2.8) project(mytest) find_package( VTK REQUIRED ) include( ${VTK_USE_FILE} ) add_executable(${PROJECT_NAME} Read more…
The filter vtkWarpScalar can help us to move the point along point normal by the scalar amount times the scale factor. We can change the size of the original model with it as long as there are normals in data. The following example has two renderers, the left renderer shows Read more…