Tearing appears in displacement mapping result

Although the texture map applied to my polygon object is seamless in all directions, I still obtain a tearing effect once I use that very same texture as a displacement map for my polygon object. Why is that?

Example:
<A href="/xsinet/toolpic/disp_lo_discnt.jpg">/xsinet/toolpic/disp_lo_discnt.jpg</A>

When using displacement maps with polygon geometry, make sure that the Discontinuity angle value in the Geometry Approximation tab is high enough. If a polygon mesh has a normal discontinuity (e.g. a value of 60.0), then the polygons will separate when displaced, since each polygon will be pushed in a separate direction.

Simply increase the Geometry Approximation-Polygon Mesh-Discontinuity angle to 100.0 (or higher), and the tearing effect will be corrected. 60 degrees was not enough in this case study, and a higher value of 100.0 was used to remedy the situation.

Example:
<A HREF="/xsinet/toolpic/disp_hi_discnt.jpg">/xsinet/toolpic/disp_hi_discnt.jpg</A>