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Intro to shaders

What is a shader and what does it do, how is it used?

Examples:

<Code:none linenums:0 |Example shader for portal effects: portals.shader> models/fx/portal/bluering {

surfaceparm nodlight
surfaceparm noimpact
surfaceparm nolightmap
surfaceparm nomarks
cull disable
{
	map models/fx/portal/bluering.tga
	blendfunc add
	rgbGen identity
	tcMod scroll -0.2 0
}

}

models/fx/portal/bluecenter {

portal
surfaceparm nodlight
surfaceparm noimpact
surfaceparm nolightmap
surfaceparm nomarks
cull disable
{
	map models/fx/portal/bluecenter.tga
	blendfunc add
	rgbGen identity
	tcMod rotate -5
}

}

</Code>

Image:

Shader resources

Unorganized