Marc Jacquier wrote:

> news:423730c7$1@news.povray.org...
> 
>>Also, Why does 'not' the pigment behave like I would expect.
> 
> the pigment behaves  like you would expect
> but the image function evaluation is done on the x-y plane not ont the x-z
> plane!
> so you have to follow Slime's advice: either rotate your pattern by x*90 or
> use spherical pattern
> 
> Marc
> 
> 
Yes I see that that works except the effect seems to translate by z*1 
but I've got to say, for me this is all completely counter intuitive. 
Whether I use it for a pigment or for a hf I picture the function, as 
described in the docs as a sort of column along the y axis such that any 
point on the y xis would return a value of 1, any value at x=1 and z=0 
would return 0 for all values of y, etc.  That seems to happen if I use 
the function in a pigment whether I rotate or not.  When the pattern is 
used in a hf it seems to act like it is a cylinder along the y=-1 axis 
that is then rotated?  Forgive me if I am being a pest.  I really am 
having trouble picturing this.  But I also had similar misunderstandings 
when using the wood pattern.  So I truly believe you guys are all able 
to picture something that I am just not getting lol.

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