> Jaime Vives Piqueres <jai### [at] ignoranciaorg> wrote:
>>     Well... you really didn't need alpha for this:
>
> I always have to add my trademark "unnecessary level of added complexity" to my
> first go at things.  :)
>
>> the height_field
>> object has a "water_level" statement wich allows you to cut the
>> undesired parts.
>
> Argh.  I was starting to look at that and consider it, but it was after a long
> day of puzzling out other things.   That's obvious now - thanks!
>
>> This way you don't need to use a texture map, just a
>> regular texture. For this to work, just paint the border and center with
>> total black, and the desired frame with a grayscale above black,
> .....
>>     Also, I guess you may want to reverse the texture map entries and
>> adjust the transition...
>
> I see.  This works well now.
>
>
> Thank you for your expert assistance - I'm always amazed at your raytracings.
> You have a real knack for composition, details, texturing and lighting that
> always knocks my socks off.   Thanks for all of your inspirational images over
> the years!
>
> -----------------------
>
> I have a few more questions related to this topic.
> Because of the way POV-Ray maps the image to the primitive, it needs to be
> scaled to something proportional to the image's original aspect ratio.  Is there
> a way to pull this value from the file with POV-Ray?  I'm assuming the
> information is readily available, since Windows displays it when I mouse-over
> the filename, and POV-Ray has to be able to determine this to correctly read the
> file format.
>
> This would be super handy for evaluating a lot of different images, especially
> with an array of filenames and invoking POV-Ray's animation features.
>
> Suppose I DID use the alpha channel.
> Is there a way to use that for a second texture, so that I can use water-level
> to get rid of the perimeter, and put the second texture inside the frame?
>
> Thanks for your prompt reply!
> (I had a late night, so I'm just resuming work on this now.)
>
>

You may try max_extent(Your_Image)
As of version 3.7, it's suposed to return the dimentions of an image 
when the provided object is an image.


Alain

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