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In RenderMan for Maya, this attribute is enabled by the "Prevent polygon cracking" (rman_preventPolyCracks) check box. 

Hover over the image to see its effects.


Rollover Image Link
hoversmoothdisplacement_1_dsp.jpg
imagesmoothdisplacement_0_dsp.jpg
Hover = Prevent polygon cracking

Note

"Prevent polygon cracking" should only be enabled when necessary as it uses a bit more memory. The amount used is proportional to the number of vertices in the mesh.

Notice When you hover over the image, notice how using smoothed normals warped the cube's displacement pattern and changed its appearance:

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Rollover Image Link
hoversmoothdisplacement_topo_2.jpg
imagesmoothdisplacement_topo_0.jpg
Before After Image Slider
hoverfalse
methodoverlay
overlayedSlidertrue
leftImagesmoothdisplacement_topo_0.jpg
rightImagesmoothdisplacement_topo_2.jpg