I second those thoughts (Hadley) - 3D is exploding in accessibility and should be. While accuracy and "specialized data features" like tolerance and stuff is always a goal for the engineering reviewers, the broader usability of any 3D viewer format is much more important.
Two cooperating engineers might be annoyed that they cannot use all the CAD package features om viewer models - but if that problem arises then it should be solved in the CAD package, not through the viewer format. Engineers would have to adapt by exchanging complex data models seperately but on the other hand maybe another 5 groups of employees are simultaneously adapting to the whole concept of 3D reviews - so it's a fair trade-off in order to heighten comminication and overall product development, don't you think?
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