Hi Ernie- > Hi DonWhat I have noticed that the Isosurfaces break down into large > trianglular planes, so that the surface appears to be "crystaline". I have > also seen this occur with other model products with wind field isosurfaces. > Maybe some kind of a driver issue (?), but 2.6 renders these perfectly, Okay. I'm not seeing that on my machine. It could be a driver or memory issue. Try reducing the memory to 1024m and see if that makes a difference. Can you send me a screenshot of the crystalline structure? Also, if you subset the grid (use every other point), does that change the behavior? Don Murray Ticket Details =================== Ticket ID: CDH-643541 Department: Support IDV Priority: Normal Status: Open