Iris is a rather barebone engine, as far as the public release goes not much you can modify.
You can create maps easily (must be compiled with q3radiant 202, because of the q3map compiler)
the MD2 format is the same as the Quake 2 MD2 format, nothing is changed
the only supported texture format is 24 and 32bit uncompressed TGA's under a 256 color restriction
and you cant really edit much elce...
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