Hi Matt,

  Eric is right.  Here it is with example Python code

from VolumeViewer import active_volume
v = active_volume()
s = v.matrix_value_statistics()
print s.minimum, s.maximum

The active_volume() call can return None, for example if no data set is open.  The matrix_value_statistics() call returns the values at the currently displayed subsampling (ie. step size).

  Your comment about the "use mouse scroll wheel" setting not working is a bug that I will look at soon.

http://plato.cgl.ucsf.edu/trac/chimera/ticket/12187

  Tom


On Jul 1, 2013, at 11:14 AM, Eric Pettersen wrote:

On Jun 28, 2013, at 9:22 PM, "Dougherty, Matthew T" wrote:

I am trying to write some python scripts relating to volume viewer.

two things I need to have are:
1)  the ability to figure out what dataset is active on the volume viewer.  I will manually pick that with the mouse, my python sw will process the active model in volume viewer. 
2) on the selected dataset I need to know what the min/max values are.

Hi Matt,
As you know, Tom Goddard is on vacation -- so these answers are for novelty purposes only. :-)

1) I'm pretty sure that VolumeViewer.volumedialog.active_volume() will return the active volume (can return None of course in some cases).

2) I think that calling the volume's matrix_value_statistics method will return an object whose .minimum and .maximum attributes are what you want.  Maybe.

--Eric

                        Eric Pettersen
                        UCSF Computer Graphics Lab
                        http://www.cgl.ucsf.edu

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