Editing Vtk/SimpleCubeTutorial (section)

====Deciphering VTK's ''default'' Lookup Table====
While color values that are prescribed by VTK's ''default'' lookup table have been used in the three example ASCII files just discussed &#8212; Examples A, B, and C &#8212; the code that VTK uses to map scalar values to specific colors has not been explicitly provided.  When I began trying to understand, for myself, how color specification is handled in VTK, I was unable to locate a reference that spells out what the properties are of the ''default'' lookup table.  By experimentation I discovered that a simple lookup table that comes close to mimicking the default one is as follows:
<div align="center">
<pre>
LOOKUP_TABLE my_table 6
1.0 0.0 0.0 1.0
1.0 1.0 0.0 1.0
0.0 1.0 0.0 1.0
0.0 1.0 0.0 1.0
0.0 1.0 1.0 1.0
0.0 0.0 1.0 1.0
</pre>
</div>

Eventually I discovered documentation that defines the default settings for VTK's color maps.  In &sect;6.6 of [http://www.amazon.com/Visualization-Toolkit-Object-Oriented-Approach-Graphics/dp/193093419X/ref=pd_sim_sbs_b_1?ie=UTF8&refRID=0EFGPTSBP5E136WEK4V7 Schroeder, Martin, &amp; Lorensen (2006)] (see specifically the subsection titled '''Color Maps''' on p. 196), we are told the default settings are established via a specification of HSV (Hue-Saturation-Value) rather than via an <font face="Courier">rgb</font> specification.  The default settings are:  HueRange (0, 2/3); SaturationRange (1,1); and ValueRange (1,1).  This terminology is explained in an [[vtk/ColorLookupTablea#Color_Lookup_Tables|accompanying presentation]].