rendercolor does not really do anything by itself, it should be accompanied by a render mode or render effects.
for information about rendering properties, check out this article at the VERC:
http://collective.valve-erc.com/inde...87068-71355600
to apply rendering properties to a non-player entity, use set_rendering from engine_stocks.inc:
http://www.amxmodx.org/funcwiki.php?go=func&id=405
also, a suggested alternative to float(str_to_num(variable)) would be, simply, floatstr(variable).
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