Getting viewport coordinates from world

Support
1

I have a 3d model loaded in vtk and I’m using vtkCellPicker to get the world coordinates for a point. But how can I keep track of the 2d position on the viewport that corresponds to that coordinate after I’ve rotated the model?

So the world coordinates are fixed but I want to coordinates of that 3d point on the 2d window(x,y).

2

Usually we handle all interactions by markup points. So, it should not be necessary to use low-level tools, such as pickers. What is your end goal?

If you go lower level and use VTK then you can find answers to your questions on VTK forums. For example, how to convert world to display coordinates.