On Wed, 09 Aug 2000 14:37:37 -0500, David Fontaine <dav### [at] faricynet>
wrote:

>In POV 3.5 I would like to see the following implementations:
>- True wavelength-dependent interference
>- Polarization and polarizing filters, including ior-dependent polarized
>reflection
>- Differentiation between absorption and interference filtration

The main difficulty with the above features is conversion from rgb to
spectrum space. Simply said, it's impossible. It can be faked in a lot
of ways like rgb -> hsb conversion but they will not come close to the
real thing as spectra are usually very complex with emission and
absorption lines and regions and so on.

Now, if all colors were represented in spectrum space, things would be
much easier. I don't think users will love tweaking such colors,
though :)

>- Diffraction
>- Optical birefringence

Diffraction is tricky. I don't think it's impossible but it would
probably require insane render times (unless someone comes up with a
algorithm of following a wave front which does not require extensive
Monte Carlo sampling).

>- Non-uniform ior for object interiors

This has been discussed more than enough so I'll just skip it.


Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] usanet
TAG      e-mail : pet### [at] tagpovrayorg

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