3D SLICER STEP 2-- the 'Volumes' module (COMPLETELY OPTIONAL)

At the  'Welcome to Slicer' icon (menu) at the top, choose the 'Volumes' module
instead. The window that appears has some interesting features.

At 'Active Volume', you should see the name of the first image slice you opened
previously. If not, 'Select a volume' there and  choose that image name from the
options. This opens a partial data field.

Look for a little checked 'interpolation' box; this is ON by default, and
slightly smooths the three orthographic views. You can turn this off the see the
raw image-slice pixels. This interpolation does NOT affect the (later) 3-D view,
or the final model output; it's just for previewing.

Now click on the little arrow at  'Volume information' to open its sub-menu. The
three  'Image Spacing' boxes that appear are for varying the default 1X1X1mm
voxel size of the app-- should you have a need for that, or to correct any
out-of-shape proportions of your model. Essentially, you can squash-and-stretch
the model here, and the three view-panes update automatically. However, this
simply stretches or distorts the individual voxels-- and the final .stl
triangles; no new ones are created. (I think there is a slight bug when trying
to enter fractional values; the cursor caret does not behave well, compared to a
traditional word processor.)

         ------ END OF OPTIONAL STEP 2------

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