The article discuss an issue about set position for vtkTextActor object. The class vtkTextActor provides interface SetPosition, its parameter controls object’s left-bottom coordinate. /** * Get the PositionCoordinate instance of vtkCoordinate. * This is used for for complicated or relative positioning. * The position variable controls the lower left corner Read more…
We often subtract mesh by other object to get the result we want. The scene looks like the following image. #include <iostream> #include <vtkSmartPointer.h> #include <vtkSphereSource.h> #include <vtkActor.h> #include <vtkConeSource.h> #include <vtkRenderer.h> #include <vtkRenderWindow.h> #include <vtkPolyDataMapper.h> #include <vtkRenderWindowInteractor.h> #include <vtkClipPolyData.h> #include <vtkImplicitBoolean.h> #include <vtkPlanes.h> #include <vtkDataArray.h> #include <vtkDoubleArray.h> #include <vtkProperty.h> Read more…
I want to cut the cone by two planes to remove the right-top part just as the following image. Rewrite vtkClipPolyData We can add multible clip functions for vtkClipPolyData to make it works. The files about the class multiClipPolyData had been push to GitHub, cut mesh by multiple planes. Use Read more…
Let’s describe a 3D parametric curve by the form. The value s is in [0, 1]. It is a circle when s is zero, in the other situations it represents a spiral. #include <vtkPointData.h> #include <vtkSmartPointer.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkRenderer.h> #include <vtkPolyData.h> #include <vtkProperty.h> #include <vtkSphereSource.h> #include <vtkPolyDataMapper.h> Read more…
The post shows how to cut image by a plane smoothly. Header And Macros #include <vtkVersion.h> #include <vtkImageData.h> #include <vtkImageMapper3D.h> #include <vtkImageStencil.h> #include <vtkImageStencilData.h> #include <vtkImageToImageStencil.h> #include <vtkJPEGReader.h> #include <vtkPointData.h> #include <vtkSmartPointer.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkInteractorStyleImage.h> #include <vtkRenderer.h> #include <vtkImageActor.h> #include <vtkPolyDataToImageStencil.h> #include <vtkPolyData.h> #include <vtkSTLReader.h> #include <vtkProperty.h> Read more…
The geometry meaning of the determinant is the sign volumn value for three vectors in 3D world or a sign area value of two vectors (parallelogram) in the 2D coordinate system. For three points in the 2D world: The triangle is counterclockwise ordered if and clockwise ordered if Read more…
Here is dump log which shows the stack information. The class CBase has OpenModule and CloseModule interfaces, they can be called multible times. exe caused an Access Violation at location 00007FFA62174327 in module vtkCommonCore-8.2.dll Reading from location 0000000000000DA4. AddrPC Params 00007FFA62174327 0000000000000001 00007FFA9011F05B 0000013DF642A190 vtkCommonCore-8.2.dll!vtkCollection::DeleteElement 00007FFA62174155 0000000000000001 00007FFA622D3BFF 0000013DF6429290 vtkCommonCore-8.2.dll!vtkCollection::~vtkCollection Read more…
We have a model looks like in the following scene. It has been cut by a plane but the shape changed after that. So its surface become not flat. I got the cut plane information and planed to project all points on the cut part to the plane. The code Read more…
The article describe a simple way to display point id list on the original model. We use VTK to draw and show all scenes. vtkSmartPointer<vtkPolyData> UShowData::ShowListByPoints(vtkSmartPointer<vtkPolyData> polyData, vtkSmartPointer<vtkIdList> list) { vSPNew( result, vtkPolyData ); vSPNew( resultPts, vtkPoints ); vSPNew( resultVerts, vtkCellArray ); for( int i = 0; i < list->GetNumberOfIds(); Read more…