local function StencilStart()
	render.ClearStencil()
	render.SetStencilEnable( true )
	render.SetStencilWriteMask( 1 )
	render.SetStencilTestMask( 1 )
	render.SetStencilFailOperation( STENCILOPERATION_KEEP )
	render.SetStencilZFailOperation( STENCILOPERATION_KEEP )
	render.SetStencilPassOperation( STENCILOPERATION_REPLACE )
	render.SetStencilCompareFunction( STENCILCOMPARISONFUNCTION_ALWAYS )
	render.SetStencilReferenceValue( 1 )
	render.SetColorModulation( 1, 1, 1 )
end

local function StencilReplace()
	render.SetStencilCompareFunction( STENCILCOMPARISONFUNCTION_EQUAL )
	render.SetStencilPassOperation( STENCILOPERATION_REPLACE )
	render.SetStencilReferenceValue(1)
end

local function StencilEnd()
	render.SetStencilEnable( false )
end