Horror, I've discovered that POV's units of measurement aren't
completely arbitrary, at least not if you're using pattern normals.

Try rendering this code with various values for Scale.
I was making a scene with the ubiquitous stone columns using centimetres
as my units, and then when it came to adding the normals to the columns,
the normals didn't show up.
I had to go through the whole scene and scale it to metres to get the
normals to work right :(

Hmm.. maybe in the next release this will be fixed ( please :) )

< ------- Cut here ------ >
// Non arbitrary POV units :(

#declare Scale = 1 // Set this to various values

camera
{
	up y
	right 4/3*x
	location <0,0, -10>*Scale
	look_at <0,0,0>
}

light_source
{
	<300,500,-600>*Scale
	rgb 1
}

cylinder
{
	-y*2,y*2,2
	pigment{rgb 1}
	normal{ radial .5 sine_wave frequency 12 }
	scale Scale
}
< ------- Cut here ------ >

Well cheerio for now,
	PoD.

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