Bruno Cabasson wrote:

> Any idea welcome.
>

A loose *intersection* of "Euclidian" solid objects
from traditional planar geometry and the objects of POV
syntax.
Box, Cone, Cylinder, Sphere, Torus, Plane

Either limit the scene to a subset of these
or
to a choice of ONE of these

Based on the docs:

*Solid Finite Primitives*
There are fourteen different
solid finite primitive shapes:

No  blob
*Yes box*
*Yes cone*
*Yes cylinder*
No height field
No Julia fractal
No lathe
No prism
*Yes sphere*
No spheresweep
No superellipsoid
No surface of revolution
No text object
*Yes torus*

*Finite Patch Primitives*
There are six totally thin, finite
objects which have no well-defined inside.

No bicubic patch
No disc
No smooth triangle
No triangle
No polygon
No mesh / mesh2

*Infinite Solid Primitives*
There are five polynomial primitive shapes
that are possibly infinite and do not
respond to automatic bounding.

*Yes plane*
No cubic
No poly
No quadric
No quartic

*Parametric Object*
Where the isosurface object uses implicit surface functions, F(x,y,z)=0, 
the parametric object is a set of equations for a surface expressed in 
the form of the parameters that locate points on the surface, x(u,v), 
y(u,v), z(u,v). Each pair of values for u and v gives a single point 
<x,y,z> in 3d space

No Parametric Object

*Isosurface Object*
No Isosurface object

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