Le 17/08/2012 05:26, ltong a écrit :
> This is certainly simple for advanced users, but I'm having problem to figure it
> out. The documentation says value_n in color_map is calculated using x,y,z
> location of a point where color_n will be applied. So, how is value_n calculated
> exactly? How does one know which position value_n represents in an object? I
> would guess translation and rotation don't affect. Many thanks in advance!
> 
> 
> 


Hello,

when referencing documentation which might need clarification, please
provide at least an exact reference to it, or cite it.

For instance,
> http://wiki.povray.org/content/Reference:Color_Map
states that:

=== begin quote ===

Each of the various pattern types available is in fact a mathematical
function that takes any x, y, z location and turns it into a number
between 0.0 and 1.0 inclusive. That number is used to specify what mix
of colors to use from the color map.

=== end quote ===


So, the value_n used for the color_map is computed by the pattern. The
pattern you choose to associate for the pigment that uses the color_map

Regarding influence of rotation/translation/scale/transform, please check:
>>
http://wiki.povray.org/content/Documentation:Tutorial_Section_2.2#Transforming_Textures_and_Objects

Have a nice day.

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