VTK notes - picker picker summary

  executive summary

To put it simply , There are two types of pickups ：
One is based on hardware pickup , Such as vtkPropPicker And its subclasses 、vtkAreaPicker And subclasses
The other is based on geometric picking , Such as vtkPicker And its subclasses
The advantage of hardware pickup is fast , But access to information is limited
Geometry picking can get more information , But the speed is relatively slow

vtkPropPicker

Use the hardware pickup strategy to determine what is picked vtkProp object , Including the world coordinates of the pick point . It's usually better than vtkAbstractPropPicker Other subclasses of are faster , But it cannot return the details of the picked object .

post ：vtk One Randerer Multiple Actor Problems of independent operation vtkPropPicker Pick up function _ Love the blog of the west wind -CSDN Blog

vtkAreaPicker

vtkAreaPicker And its subclasses vtkRenderedAreaPicker It is also based on hardware , Also, the details of the picked object cannot be obtained , Their role is to select objects on the screen .

post ：vtk vtkAreaPicker Polygon selection part _ Love the blog of the west wind -CSDN Blog

vtkPicker

vtkPicker It is a pickup class based on software implementation , The specific implementation is based on vtkProp Object's bounding box to pick the object's .
vtkPicker There are three subcategories , Two of them are vtkPointPicker and vtkCellPicker, They can get the details of the picked object , As ordered ID, The unit's ID etc. .

vtkPointPicker

Used to pick a single point , return ID And coordinate values .

post ： Modify by modifying points vtkPolyData_ Love the blog of the west wind -CSDN Blog

vtkCellPicker

Used to pick a cell , And return the information of the intersection , vtkCellPicker Is the slowest of all pickup classes , But getting information is the most . By specifying tolerance , You can return a single picked object .
  post ：https://blog.csdn.net/q610098308/article/details/125421795