Editing Vtk/Quadric (section)

===vtkPolyDataMapper===

This default workflow contains two independent instances of the vtkPolyDataMapper module.  The instance on the left plays a role in mapping the nested color contours to the image screen (that is, to the spreadsheet window) while the instance on the right plays a role in mapping the bounding box to the screen.  
* vtkPolyDataMapper (left) &#8212; notice that a ScalarRange of (0.0, 1.2) has been explicitly assigned, which is exactly the same "scalar range" that has been explicitly assigned inside the vtkContourFilter module.  This means that the [[vtk/SimpleCubeTutorial#Deciphering_VTK.27s_default_Lookup_Table|default color table]], which spans from red to dark blue, should be stretched to cover the entire range of scalar values that is being probed.  The colors of the five distinct contours can be changed by specifying a different ScalarRange inside this instance of vtkPolyDataMapper (left).  For example, setting ScalarRange = (0.0, 0.6) will squeeze the full dynamic range of the color table into a narrower range of scalar values; the first three contours &#8212; <math>~F_0</math> = 0.0, 0.3, and 0.6 &#8212; will be colored red, green, and dark blue, while the last two contours  &#8212; <math>~F_0</math> = 0.9 and 1.2 &#8212; will be pegged to the color dark blue because they are outside of the new identified range.
* vtkPolyDataMapper (right) &#8212; notice that default values and behaviors are accepted throughout.

We should point out that, in this default workflow, the color of the bounding box is set (to black) by the Color method inside of the vtkProperty module; this can be readily changed to generate a bounding box whose edges are a different color, for example, red.