Something that's always given me trouble is the scaling 
factor to use with the woods.inc textures.  One time I made 
a set of planks to  test them out, but don't remember the 
results.

I understand that the long-grain is the Z direction.  But 
what is the unit size?  Is it one unit per growth ring, or 
what?  That is, how many POV units wide is a 2x4?

--John

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