PoD wrote:
> 
> I have an old POV file which has image_maps declared in the following
> manner
> 
> image_map {
>   <0 1 -1>
>   tga "blah.tga"
>   ...}
> 
> The warnings I get suggest that the vector at the top is for orienting
> the image, but it's ignored in 3.1.
> I don't have docs for old enough versions to explain this vector, how do
> I transform this image_map to get the same effect?
> 
> Thanks, PoD.

Here is what I could find for you from the Pov v1.0 docs:


       The documentation for image_map explains the basic options 
       which are true for all mapping types.
       
       image_map - Color Pattern.
       Syntax:
       image_map { [map_type #] [<gradient>] image_type "filename" 
       [alpha # #] [once] [interpolate #] }
       
       This is a special color pattern that allows you to import a 
       bitmapped image file in GIF, TGA, IFF, or DUMP format and 
       map that bitmap onto an object. 
       
       For example:
       
       // Use planar (type 0) mapping to project falwell.gif 
       // onto the shape in a repeating pattern.
       // Set interpolation to 2 (bilinear) so the mapped GIF will 
       
       // be smoothed and not look jaggy.
       image_map {   
         map_type 0 <1 0 -1> gif "falwell.gif" interpolate 2 
       }
       
       or
       
       // Use spherical (type 1) mapping to 
       // wrap earth.tga once onto a unit sphere
       // No interpolation is used, so it may look 
       // jaggy
       image_map {   
         map_type 1 tga "earth.tga" 
       }
       or
       // Use cylindrical (type 2) mapping to wrap 
       // cambells.gif once onto a unit cylinder.
       // Set interpolation to 4 (normalized distance)
       // so the mapped GIF will be smoothed and not look jaggy.
       //  Norm dist isn't as good as bi-linear, but it's faster.
       image_map {   
         map_type 2 <1 -1 0> gif "cambells.gif" interpolate 4
       }
       
       The texture in the first example will be mapped onto the 
       object as a repeating pattern. The once keyword places only 
       one image onto the object instead of an infinitely repeating 
       tiled pattern. When once is used, the color outside the 
       mapped texture is set to transparent. You can use the 
       layered textures to place other textures or colors below the 
       image.
       
       The image map methods sphere, cylinder, and torus, wrap the 
       image once and only once around a unit shape of the same name. The 
       map may be scaled uniformly to apply to larger shapes. The maps 
       may be applied to any shapes, but the results are undefined.
       
       The planar image map method is like a slide projector and 
       will work the same for any shape.



-- 
Ken Tyler

mailto://tylereng@pacbell.net

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