----quote----
Quality=n	Set quality value to n (0 <= n <= 11)
+Qn	Same as Quality=n

The Quality=n option or +Qn switch allows you to specify the image rendering quality.
You may choose to lower the quality for test rendering and raise it for final renders.
The quality adjustments are made by eliminating some of the calculations that are
normally performed. For example settings below 4 do not render shadows. Settings below
8
do not use reflection or refraction. The duplicate values allow for future expansion.
The values correspond to the following quality levels:

0, 1	Just show quick colors. Use full ambient lighting only. Quick colors are used
only
at 5 or below.
2, 3	Show specified diffuse and ambient light.
4	Render shadows, but no extended lights.
5	Render shadows, including extended lights.
6, 7	Compute texture patterns.
8	Compute reflected, refracted, and transmitted rays.
9	Compute media.
10	Compute radiosity but no media
11	Compute radiosity and media

The default is 9 if not specified.
----unquote----

This is how the POV-Ray 3.1 Scene help reads. The 0,1 and 2,3 and 6,7 are apparently
simply the same things.


Mark Wagner wrote:
> 
> What calculations do the various Quality levels activate?  That section of
> the Windows help file is messed up, so I can't tell if, for example,
> 'Compute texture patterns' goes with quality 5 or quality 6.
> 
> Mark

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