Maya 2008

From ZBrush Info

Maya 2008 introduces a new way of rendering displacement maps, using ccmesh primitives instead of subdivision base mesh primitives. This has been known to create seams in renders of displacement maps that have been created using ZBrush. To correct this, you need to instruct Maya's subdivision approximation node behavior to use the older method.

Open the script editor and execute the following line:

addAttr -ln "miExportCCMesh" -at bool mentalraySubdivApprox1;

Make sure you name your mental ray subdivision approximation node as in this command line (or change the command line).

If your node´s name is different then change the command line appropriately:

addAttr -ln "miExportCCMesh" -at bool NameOfYourSubdivApproxNode;