In article <FUMSOZRek52TE5mBLKHN7VYeCs19@4ax.com>, Glen Berry 
<7no### [at] ezwvcom> wrote:

> Splines sound like a good idea. I wasn't sure how elaborate you were
> wanting to get. It would be really nice to be able to enter a series
> of values (input vs output levels), and have the software generate a
> smooth response curve from them.

That is what I am planning...but I am debating whether to use an 
internal spline(probably a cosine spline, maybe an optional cubic 
spline), or to use a color_map(easier, multiple "film types" can be 
declared in an include file and used in the "curves" filter, but I 
suspect only uses linear interpolation.).
Maybe a "blend_type" option should be added to _maps to switch between 
cosine, linear, cubic, etc. This would solve the problem with using 
color_maps, and make anything which uses color_maps, texture_maps, 
normal_maps, etc more flexible as well.

-- 
Christopher James Huff - Personal e-mail: chr### [at] yahoocom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://chrishuff.dhs.org/
TAG Web page: http://tag.povray.org/

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