Wasn't it Bill who wrote:
>I'm trying to get a text object to align relative to the center of a  
>sphere. The sphere is at <0,0,0>.  Since text initially sits with the  
>front-bottom-left corner at <0,0,0>, I've translated it to be just in  
>front of the sphere.
>
>The challenge is to get the correct x-coordinate fot the text object so it  
>is centered relative to the sphere.  So far, all I know how to do is  
>adjust the x coordinate by trial-and-error.  Is there some way to obtain  
>the size of the text programatically and set it's location using an  
>expression?

You can centre text, or any other type of object, in one dimension with
Center_Object().

#declare T = text { ttf  "crystal.ttf", "POV-Ray", 2, 0 pigment {rgb x}}
#include "shapes.inc"
Center_Object(T,x)


You can centre text, or any other type of object, in three dimensions
like this:

#declare T = text { ttf  "crystal.ttf", "POV-Ray", 2, 0 pigment {rgb x}}
object {T translate -(min_extent(T) + max_extent(T))/2}


There's also Text_Space() and Text_Width() in "shapes.inc" that perform
the (max_extent(T).x-min_extent(T).x) calculation for you.

-- 
Mike Williams
Gentleman of Leisure

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