Here is an interesting blog post from our network team on support for 3D networks:
“What do you get when you cross the 3D Analyst extension with the Network Analyst extension?”
Gert van Maren
3D Product Manager
3D network support in ArcGIS10
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I just upgraded to ArcView 10. I was completely shocked to find that the 3d analyst extension for ArcView 10 is so bad. Simple functions such as create tin from features, surface analysis, slope, aspect, etc. were not there. even doing creating contour is a pain, and there is no more options for selecting the contour intervals! Please give me back 3d-analyst of ArcView 9.3.1!!!