how you get the contour line from the heightmap in maya

how you get the contour line from the heightmap in maya 


> file drag to displacementmap to lambert initial shading group convert from displacement to polygon- mesh reduce 
> ramp(color:bwb, none to transparency in lambert), in ramp 2d texture attribute, u can animate click repeat uv, type, etc... ramp to reverse attribute. ramp to transparency in lambert