Povray
This article provides knowledge about different types of geometric primitive objects that can be exported from BRLCAD to POVRay geometry file. Their properties, functions used for them, parameters are discussed in section below.
To Know more about POVRay, here are some links below:
Below is the list of primitives that are working/exported correctly, partially and not touched yet.
Arbitrary convex polyhedra
ARB8
This primitive is formed in POVRay using mesh.The mesh object can be used to efficiently store large numbers of triangles. Example:
mesh{triangle{a,b,c}triangle{a,c,d}triangle{a,d,f} triangle{g,h,c}triangle{e,f,g}triangle{e,g,h}}
ARBN
An arbn record is specified by N sets of intersecting planes, each defined by four coefficients:

the {X, Y, Z} coefficients of the plane’s normal vector pointing outward from the center of the arbn shape, and

the perpendicular distance of that plane from the origin.
Its exported in POVRay by using intersection of Planes. Example:
intersection{ plane{<x, y, z coefficients>, normal} ... }
Ellipsoids
ELL
This primitive is named as spheroid in POVRay. It is having Center Vector, Radius Vector Example:
Spheroid(<1.50,3.00,2.00>,<2.0,1.2,2.5> )
EHY
Elliptical Hyperboloid of BRLCAD can be formed by POVRay. Currently its coordinates are exported successfully and is done by using quadric equartions of POVRay
Cones and Cylinders
Truncated General Cone
This primitive of BRLCAD is formed by using Supercone of POVRay. Example:
Supercone( //point A, axis Ax, axis Az:<0.0,0.0,0.0>, 0.5, 1.0, // point B, axis Bx, axis Bz:<0.0,1.5,0.0>, 0.7, 0.4)}
Cone
This primitive of BRLCAD is named as Cone in POVRay. It is formed as Center and radius of one end Center and radius of other end Example:
cone {<0, 1, 0>, 0.3 <1, 2, 3>, 1.0 texture { T_Stone25 scale 4 }}
Cylender
This is formed by Cylender of POVRay. center_of_one_end, center_of_other_end and Radius Example:
cylinder { <0, 1, 0>,<1, 2, 3>,0.5 }}