Ken wrote:
> 
> 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

Thanks Ken,
  I could of course use the #version directive, and would on a large
file but I'm just the sort of person who likes to know how things
actually work.

Cheers, PoD.

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