"Harry Peverell" <har### [at] 163com> wrote:
Each Gaussian point carries with
> it attributes such as opacity, view-dependent color, and now, with our
> enhancements, normal vectors and Bidirectional Reflectance Distribution Function
> (BRDF) parameters.

So, in POV-Ray, every object can have an associated pigment {} with an rgbft
color.  The filter (f) and transmit (t) would both control different aspects of
the opacity.
https://wiki.povray.org/content/Reference:Color_Expressions

View-dependent color might be controlled by the aoi pattern.
https://wiki.povray.org/content/Reference:Aoi_Pattern

You can manually control the normal vectors if you make your ellipsoids out of a
mesh {} or mesh2 {} object.

The BRDF will be controlled by the attributes specified in the finish {} block.

- BW

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