Hi Tom, currently MoI doesn't do edge weights for subdivision surfaces. Edge weights are not part of the .obj file format and so can't come over by the current import route either.

re:
> Subdivision Surfaces are only really useful if there is edge-weighting, otherwise it's only usable for some edge cases.

For most people this is incorrect, the most common use of subdivision surfaces is for creating organic smooth shapes without edge weights.

It's only a smaller set of people trying to use subdivision surface modeling for hard surfaces that require this.

it's not a focus for MoI as of yet because these types of hard surface models are generally better to create directly in NURBS rather than in subd. You can't even get an exact circle or cylinder in a sub-d model, it's not a good fit for mechanical shapes that have features like exact circular holes and similar things in them.

I understand that you need it for your particular use case, but sorry that type of use is not the current focus.

- Michael