for all of you who feel the need to dabble in modeling.
http://www.alias.com/eng/products-services/maya/maya_ple/index.shtml
maybe you can grab RenderMonkey from ATi and create a level for HalfLife
http://www.alias.com/eng/products-services/maya/maya_ple/index.shtml
maybe you can grab RenderMonkey from ATi and create a level for HalfLife