Hi David,
Thanks a lot for your reply.
You might not need to use AreaPicker. It's job is to pick entire
Props, you seem more interested in cells and points on a particular
prop. VisibleCellSelector can determine props on its own if you want
it to, and the FrustumExtractor could be reapplied to all the props in
the scene if you don't end up using AreaPicker to narrow down the
list.
The InteractorStyle is useful for giving the user a rubber band to
draw on the screen with, so you might as well use that part.
Converting that 2D rectangle into a 3D rectangle is only needed if you
are selecting through. The AreaPicker can help with that if you need
it.
I need to select through (i.e. non-visible). So I could use the
AreaPicker to calculate the Frustum and pass it to the
vtkExtractSelectedFrustum object in order to select the points or cells?
So vtkExtractSelectedFrustum knows the Frustum, how do I setup the
vtkSelection object?
My guess is:
selection->SetContentType(vtkSelection::FRUSTUM);
if(mode==POINTS)
selection->SetFieldType(vtkSelection::POINT);
else
selection->SetFieldType(vtkSelection::CELL);
But what about the SetSelectionList? Is this where I need to set the
parameters of the Frustum (again)?, or will vtkExtractSelectedFrustum
ignore this list, since it already knows the Frustum?
Take a look at TestExtraction first to investigate what Selections and
Extraction are and how to use them,
Then take a look at TestAreaSelections to see how to use them to grab
things that the user identifies behind the rubber band.
I have looked at these tests, and the java example
Examples/Infovis/Java/Focus.java.
There are, however, many different combinations of
vtkSelection::SetContentType, vtkSelection::SetFieldType and it is not
clear how the SelectionList must be created for each situation, or if it
must be set at all.
Thanks,
Bryn
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