r_lod
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r_lod is a c2 available in all 
Source games. It allows overriding distance used in LOD. Higher distance, for example, makes models have less polygons, and textures appear smudged (i.e. less detailed).
Usage
Syntax: r_lod <integer>.
The default value is "-1" which makes lod compute normally. Setting this to 0 will effectively make every render as if you are close to them while a large value will make everything render as if you are far from them.
Note:Although turning r_lod off gives better visual quality, it also negatively affects your framerate (FPS), unless you have a more powerful graphics card.