[Radiance-general] instances

[Jelle Feringa / EZCT Architecture & Design Research]

Actually I've been using the 'mesh' primitive for not a long time, since
Radiance on win32 was quite crippled until Francesco's Mingw compiled
version. Since rview wasn't part of this version of Radiance its cool to see
that NRV supports it nicely.

-jelle

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	PS alternatively when the mesh is really big I use a mesh
primitive...
	but I guess you know already about.
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