[vtkusers] Picking the value of a cell

[Scott J. Pearson]

I am trying to find a way to display the information that a user clicks off
of a 2D UnstructuredGrid display; I have one constraint, that I not use the
traditional means of vtkCellPicker.

I am using VTK in conjunction with VCF, a visual component framework for
making windows in Win32. This, unfortunately, prohibits me from using the
vtkRenderWindowInteractor because the C++ code will not allow iren to
intercept all of the interactive signals. Thus, I cannot use vtkCellPicker
properly.

However, I do have the pixel coordinates in the VTK window that was clicked.
Can I translate these to query the unstructured grid for information? If so,
how do I translate the pixel (display) coordinates into x and y (world)
coordinates?

If I do this, I think it'll be easy to query the UnstructuredGrid for
information using the GetCell command.

Thanks,
Scott

---
Scott J. Pearson
Systems Programmer, Center for the Advanced Engineering of Fibers and Films
Clemson University     864.656.6389     sjpears at clemson.edu
10 Riggs Hall, Clemson, SC  29634
http://www.clemson.edu/caeff/