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Flat DTM

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I've just started exploring DTM. I made a few little practice mountains, etc., this morning, and they worked out just fine. Then I scanned in a countour map, traced the contours, and tried to model them. I set the elevation for each contour, and selected 'New DTM,' and everything seemed fine. When I view the 3D_Polys_3D layer in Plan, all the triangles show up. Sadly, when I switch to 3D view and rotate the model, it is all flat. It rotates like a sheet of paper, but all my lovely contours are stuck on the same level. I checked them out in the data layer, and they each have the appropriate (different) Z value. I removed the DTM and re-assigned elevations, and got the same result.

Does anyone know what is causing this and how I can fix it?

I'm running VW 8.5.2 on Mac OS 9.0.4



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