hl2_ep2_content/materials/shadertest/unlittexture.vmt

"UnlitGeneric"
{
	"$basetexture" "shadertest/UnlitAdditiveTexture"

	"Proxies"
	{
		"Sine"
		{
			"resultVar" "$COLOR"
			"sineperiod" 2.00
			"sinemin" 0
			"sinemax" 1
		}
	}
}