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I am not sure about this (because I don't possess every game made by Valve), but I removed two parameters from the page: "$bumpmapframe" and "$bumpmapframe2". I believe that they have been misspelled, and are actually called "$bumpframe" and "$bumpframe2". (I can find no record of the former parameters in the source files or by searching the VMTs.) If you happen to find these parameters, tell us where and put them back. --Andreasen 22:07, 23 Jan 2008 (PST)

Valve's water materials all use $bumpframe, so you're probably right. --TomEdwards 01:22, 24 Jan 2008 (PST)
Nice one Andreasen! Thanks :) --Beeswax 11:26, 31 Jan 2008 (PST)

Warning: $bumpmap will disable prop_static's per-vertex lighting. Not enough data is stored in the vertices for normal mapping, so the engine has no choice but to fall back. - Can this be circumvented using -StaticPropPolys -TextureShadows -staticproplighting during map compile? --Jike 03:20, 15 November 2010 (UTC)

Of course not, it's an engine limitation. --Legend286 20:53, 5 September 2011 (PDT)