NAME
     MaterialSpec - set material properties of spectra
     MaterialPeak - set material properties of peaks
     MaterialPrim - set material properties of primitives

SYNOPSIS
     MaterialSpec expr expr expr expr expr expr expr
     MaterialPeak expr expr expr expr expr expr expr
     MaterialPrim expr expr expr expr expr expr expr

DESCRIPTION
     Set the material properties of all selected spectra,
     peaks primitives. The first three paramters give the
     coefficients for ambient, diffuse and specular
     reflection. For good results, the ambient and
     diffuse terms should sum up to around 1.

     The fourth parameter gives the shininess, it only
     has an effect if the specular coefficient is not zero.
     Higher values for the shininess result in smaller
     specular highlights. Values can be from 1.0 (very
     dull) to 200 and more (highly polished metal).

     The fifth parameter gives the reflection. 1.0 results
     in a complete reflection of other objects in the scene
     (mirror), 0.0 in no reflection.

     The sixth parameter gives the opacity. 1.0 results
     in a completely opaque material, 0.0 in complete
     transparency.

     The seventh parameter gives the index of refraction,
     it only has an influence for (partly) transparent
     materials. 1.0 gives no refraction, 1.5 is the value
     for glass, 2.4 for diamond.

     Transparency is not supported on most hardware, and
     only to a limited amount on machines with high-end
     graphics. It is mainly useful for preparing files
     for ray tracing (PlotPOV). Reflection is not supported
     on screen, it is only used for ray tracing.

     Giving a value less than 0.0 for any value will not
     change it, this is useful for changing only part of
     the parameters.

EXAMPLES
     MaterialSpec 0.3 0.7 0.4 30 0.0 1.0 1.0

SEE ALSO
     Select*, Texture*, PlotPov

DATE
     960912
