In article <p76### [at] tritonimagicode>,
 Christoph Hormann <chr### [at] gmxde> wrote:

> Not for 24 bit tga images (which are a bad choice for heightfield data 
> anyway)  If everything works as it should image_pattern in combination 
> with a 16 bit grayscale format (png or pgm) would be the most elegant 
> solution for this purpose:

I don't know what you're talking about. Your assertion was that .hf and 
interpolation didn't mix. Then you started talking about image_pattern, 
which can't be used with the .hf feature. Now you're talking about 24 
bit RGB and 16 bit grayscale images as if it makes a difference...it 
doesn't. A 16 bit grayscale image isn't useful as input for the .hf 
feature, and makes it unnecessary. The red-green 16 bit grayscale TGA 
format is not useable as input for the image_pattern pattern, but I 
never said to use it as such. None of this has anything to do with 
interpolation.

Yes, a 16 bit grayscale PNG or PGM would be ideal height field input, 
but I don't see what it has to do with this discussion, which is about 
TGA files. A red-green grayscale TGA with interpolation and the .hf 
feature will work just as well, and you could recover the wasted space 
of the blue channel by storing something else in it.

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: <chr### [at] tagpovrayorg>
http://tag.povray.org/

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