Clientside noclip?

 	

    // SpiritWalk by RabidToaster
    // Original concept by RabidToaster + Devenger
     
    local SW = {}
     
    SW.Enabled = false
    SW.ViewOrigin = Vector( 0, 0, 0 )
    SW.ViewAngle = Angle( 0, 0, 0 )
    SW.Velocity = Vector( 0, 0, 0 )
     
    function SW.CalcView( ply, origin, angles, fov )
            if ( !SW.Enabled ) then return end
            if ( SW.SetView ) then
                    SW.ViewOrigin = origin
                    SW.ViewAngle = angles
                   
                    SW.SetView = false
            end
            return { origin = SW.ViewOrigin, angles = SW.ViewAngle }
    end
    hook.Add( "CalcView", "SpiritWalk", SW.CalcView )
     
    function SW.CreateMove( cmd )
            if ( !SW.Enabled ) then return end
           
            // Add and reduce the old velocity.
            local time = FrameTime()
            SW.ViewOrigin = SW.ViewOrigin + ( SW.Velocity * time )
            SW.Velocity = SW.Velocity * 0.95
           
            // Rotate the view when the mouse is moved.
            local sensitivity = 0.022
            SW.ViewAngle.p = math.Clamp( SW.ViewAngle.p + ( cmd:GetMouseY() * sensitivity ), -89, 89 )
            SW.ViewAngle.y = SW.ViewAngle.y + ( cmd:GetMouseX() * -1 * sensitivity )
           
            // What direction we're going to move in.
            local add = Vector( 0, 0, 0 )
            local ang = SW.ViewAngle
            if ( cmd:KeyDown( IN_FORWARD ) ) then add = add + ang:Forward() end
            if ( cmd:KeyDown( IN_BACK ) ) then add = add - ang:Forward() end
            if ( cmd:KeyDown( IN_MOVERIGHT ) ) then add = add + ang:Right() end
            if ( cmd:KeyDown( IN_MOVELEFT ) ) then add = add - ang:Right() end
            if ( cmd:KeyDown( IN_JUMP ) ) then add = add + ang:Up() end
            if ( cmd:KeyDown( IN_DUCK ) ) then add = add - ang:Up() end
           
            // Speed.
            add = add:GetNormal() * time * 500
            if ( cmd:KeyDown( IN_SPEED ) ) then add = add * 2 end
           
            SW.Velocity = SW.Velocity + add
           
            // This stops us looking around crazily while spiritwalking.
            if ( SW.LockView == true ) then
                    SW.LockView = cmd:GetViewAngles()
            end
            if ( SW.LockView ) then
                    cmd:SetViewAngles( SW.LockView )
            end
           
            // This stops us moving while spiritwalking.
            cmd:SetForwardMove( 0 )
            cmd:SetSideMove( 0 )
            cmd:SetUpMove( 0 )
    end
    hook.Add( "CreateMove", "SpiritWalk", SW.CreateMove )
     
    function SW.Toggle()
            SW.Enabled = !SW.Enabled
            SW.LockView = SW.Enabled
            SW.SetView = true
           
            local status = { [ true ] = "ON", [ false ] = "OFF" }
            print( "SpiritWalk " .. status[ SW.Enabled ] )
    end
    concommand.Add( "sw_toggle", SW.Toggle )
     
    concommand.Add( "sw_pos", function() print( SW.ViewOrigin ) end )