[Gzz] PEG: vobn

[Tuomas Lukka]

Please comment quickly - this is needed soon.

        Tuomas

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PEG vobn--tjl: N-coordinate system vobs
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:Author:   Tuomas J. Lukka
:Last-Modified: $Date: 2003/05/22 09:17:45 $
:Revision: $Revision: 1.1 $
:Status:   Incomplete

For the fillet tests (and probably also other things)
we need N-coordinate system Vobs as a generalization
of the current 1, 2, 3 -cs vobs. N-coordsys Vobs will
be used to allow a vob which is a graph node that knows
all its neighbours at render time.

The C++ part is already almost there - changes
are required to ``VobPlacer`` and the main Vob API.

Issues
======

Changes
=======

Java
----

Into ``Vob`` add ::

    int putGL(VobScene vs, int[] cs);

Into ``VobPlacer``, add ::

    void put(Vob vob, int[] cs);

which shall for now throw an exception in awt.

Implement these for GL, with a new constant
GL.RENDERABLEN, after which there is the number of
coordinate systems used.

C++
---

Naturally, interpret the RENDERABLEN constant mentioned
above.

Allow a Vob definition to give NTrans == -1, meaning N.
These will implement only ``Vob``, which already has a 
n-coordsys call. The nCoordsys() method will return -1.