The menu command
"Gem material/View-Modify Properties"
presents you with the panel to adjust
gem characteristics
The "General"
tab allows you to define the material
density and select if the gem is colored
of colorless.
The "Refraction"
tab allows you to adjust gem refraction.
The most right
way to adjust the refraction to simulate
specific gem is to input the RI value
at each wavelength using the "spectrum"
grid (see picture below). When you change
just the "refraction" parameter
then the arithmetical difference you want
to supply is added to all RI values in
the spectra. The dispersion in this case
isn't changed. This allows you to adjust
quickly and conveniently gem properties
for groups of analogous materials that
has almost the same dispersion and different
RI. If you haven't whole-spectum RI data
then you may approximate required RI values
basing on a couple of values you have.
After pressing "Adjust manually..."
button you can supply arbitrary RI and
dispersion values and the DiamCalc will
make the linear approximation to meet
the specified requirements. The button
"Select from list…" presents
you with a list of (RI and dispersion)
pairs corresponding to most gem materials.
However, by selecting the desired gem
material type from this menu you affect
only the refractive features of the material,
but the absorption and specific gravity
stay unchanged after this action.
The "absorption"
tab (for colored gems) has the same structure
as "refraction" tab. It displays
the spectrum of absorption on a diagram
and allows you to modify it. The absorption
values must be adjusted to 1mm thickness.
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