Anthony,
I totally agree with your comments
1) DTM is a capability that could be described as elegant2) The results do not seem predictable and 3) complete agreement on the lack of good help in the documentation.That said, however, I've used it quite successfully so far. I received a DXF file from the surveyor (in PC format) and VW (on a Mac) imported it successfully, albeit with a bunch of empty classes. I extracted a layer with the TIN data in it and created a DTM model with a hull and applied a groundcover texture so my 3D renderings of the house model on its site look very nice, with tree objects placed and set at the correct elevation etc. I know where to cut out the volume where the slab and foundations will go. Still exploring how to create the second DTM to do the cut/fill operation but since it's a simple residence, it's not critical for my job.
I should point out that I have no remotely related training in engineering, architecture or house-building (I'm in biotech as my "day-job" but designing my "dream house" in my spare time!) so I'd say VW and VWA are reasonably accessible to someone who's prepared to put in the time to learn those things as well as the software to do them.
The documentation for the DTM , like that for much of VWA, would greatly benefit from explanations and descriptions of tools and operations using real-life examples/illustrations as well as the "dry" descriptions in the manual and on-line help. My personal style of learning is by "seeing in action", understanding and then adapting to my situation. (In contrast to my wife, who's co-designing the house , I conceptualize things in 3D so that's why I even considered trying to design the house myself. In the 80's we had a remodel designed by an architect and I ended up building a 1/4 inch balsa wood model from the plans to convince her it was what we wanted)
Perhaps some of the tutorial CDs have such examples, but I haven't had the time to explore them - nor have I had time to attend any training classes (this isn't really a career change in the making!!) Anyone have feedback on whether the CDs would help someone like me?
ThanksAndy