Johan Feyaerts nous apporta ses lumieres en ce 13-01-2007 13:59:
> Hi ,


> I'm experimenting with picture map on a ball with mlpov.

> using the following texture
> texture{
>    pigment { color rgb <1,1,1>  }      
>   finish { ambient 0.007 diffuse 0.05 reflection { 
> <2.5,1.2,0.1>*minreffac,<0.5,0.5,0.5>*maxreffact*(3)  } } 

> }
> texture{
>    pigment {         

>          image_map
>             {
>                gif   "balpic.gif"
>                map_type 1         
>                #declare j=255;      
>                #while (j<256)
>                         filter   j, 1
>                #declare j=j+1;
>                #end//      

>            }

>          translate <0,1.1,0>
>             rotate 100*y    
>             rotate x*-22 
>                  scale  0.1

>              } 
>         finish { ambient 0.007 diffuse 2 reflection { 
> <2.5,1.2,0.1>*minreffac*0.6,<0.5,0.5,0.5>*maxreffact*(2)  } } 


> }

> When I change scale 0.1 to some other value that only seems to change 
> the position of the image and not the size of it.
> The mapped picture is a transparent canvas with the face pic in the middle.
>  Is it possible to change the size of the mapped face picture without 
> changing the position?
> or should i make the transparent bord of the mapped image bigger in 
> order to make the face relatively smaller?

You can use a spherical warp instead of map_type 1. Don't forget to add the 
keyword once, otherwise, it will get tilled.
That way, your image is first maped on a plane, starting at <0,0> as the botom 
left corner and <1,1> as the top right corner, then, it's wraped around your 
sphere. You first translate by -0.5 to center it around the origin, then you 
scale as you need and to the correct aspect ratio. This allow you to easily 
scale it as you need.

-- 
Alain
-------------------------------------------------
Fighting for peace is like screwing for virginity.
  - public toilet wall, The Bayou, Baton Rouge , LO

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