In summary, after a night pondering the issue, the slope pattern is 
applied at world-axis level, regardless of any transformation at 
local-axis level of the object. This makes slope different from the 
other patterns. This is consistent with the Docs.

To reduce confusion like we have experienced now, I think that the Docs 
should be adapted accordingly with an additional entry under *Note*, 
explaining why basic transformations of the pattern or the object do not 
work as expected.

As a solution to the initial question, I see two possibilities:

- Baking the texture using the mesh camera. See for an excellent 
explanation: http://www.ignorancia.org/en/index.php?page=mesh-camera

Using a proximity pattern technique as was developed e.g. by Sam Benge 
or Edouard Poor. This is not exactly the same as a slope pattern but can 
come close. Personally, I prefer, and use, Edouard Poor's method. I do 
not have the exact location at hand but look for the code in 
povray.binaries.scene-files, under author Edouard, date 10-9-2009.

-- 
Thomas

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