Create a sphere and clip it as the following image. We will pull down the boundary and close the opening to get a new model. How to pull down the boundary of the hemispheres? Step 1. Find all independent edges which are used by only one cell. Step 2. Connect Read more…
The interface vtkObjectBase::UnRegister will reduce the reference count for pointer and delete the pointer if the reference count becomes zero. vtkObjectBase::Delete <= vtkObjectBase::UnRegister <= vtkObjectBase::UnRegisterInternal <= delete ptr vtkSmartPointerBase::~vtkSmartPointerBase { vtkObjectBase* object = this->Object; if(object) { this->Object = nullptr; object->UnRegister(nullptr); } } We can get the reference count and consumer Read more…
There are three adjustment stages of the cone in our test. : rotate the cone and make it bigger. : translate the cone after : translate the cone from the original position. Original Scene Create an initial scene like the following image. The red Read more…
The article shows how to move a model on the surface of the other big one.I planed to move the cube on the surface of a big superquadric in the mouse left press moving event. Let’s build an original scene. Created a superquadric source object in ParaView and saved it Read more…
I found vtkSTLWriter can help us to avoid error Can’t follow edge in vtkSelectPolyData as described in the article Is there a bug in vtkSelectPolyData?. The data after I/O operations in STL file format, it can be handled correctly by vtkSelectPolyData. After tried vtkXMLPolyDataWriter, I find that the new data Read more…
I used vtkSelectPolyData to find the center area in the circle on the surface of the tooth. But it often failed to give me a satisfying result but showed the error, Can’t follow edge. The worse situation is that it crashed when I tried to access the scalar in point data. Read more…
A 3D model may be composed of a few different parts. We want to find all the independent parts. In the following code snippet, the interface GetConnectedCellIds can help us to find all the parts, DrawCells will mark a part which is represented by some cell ids red color.
The article introduces two different ways to color a cube, pointData scalars and cellData scalars.The implementations for them are in the following part. PointData Scalars Create a cube in which every side plane is formed by triangles. Every point has a different scalar value for color transform. CellData Scalars Create Read more…
单纯看“Can’t follow edge”的错误提示，我没能得到有价值的线索。不管怎么说，在使用该对象处理数据之前居然需要写读一遍信息本身就显得很诡异，或者，这就是VTK8.2上的一个bug？也许，当我升级VTK之后才能找到答案。