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steffen aarfing

unfold objects that curves in 2 dimensions

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I would like to see the 3d power pack offering an unfold of objects that curves in 2 dimensions. That would make a lot of sense for breaking down complex models for i.e. laser cutting.

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+1 if it's even possible.

Not critical, here. Just ignorant:

Is there necessarily a unique solution to the start shape for a multi curved object? eg a saddle. Seems flat version would depend on stretch in one or both of the curve dimensions. Different materials stretch differently, therefore the unfolded shape could be many sizes or shapes to accomplish the same multi curve.

-B

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Submitting request now.

Is there necessarily a unique solution to the start shape for a multi curved object? eg a saddle. Seems flat version would depend on stretch in one or both of the curve dimensions. Different materials stretch differently, therefore the unfolded shape could be many sizes or shapes to accomplish the same multi curve.

In that example, you're correct. There would be a lot of stretch/tolerance variation depending on the material you are using. But bending in more than "one dimension" also includes regular 3D shapes such as cubes or rectangular prisms.

Unfolding these types of objects is more commonly needed

and doesn't need to take into account any stretching or bending of the intended material.

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This would be a great feature. And there is an increased need with the increase in digital manufacturing.

It comes down to differentiating between developable and non-developable surfaces.

A developable surface can be unwrapped accurately. I do this all the time on projects. I have experimented with both VW and Rhino. With VW I have seen some anomalies when using the existing Unfold Surfaces command on more complicated shapes.

A non-developable surface curves in two directions at the same time. This means it can't be flattened perfectly. It is possible to create an approximation but it will always be stretched in at least one direction. Rhino, for example, has a command called "Smash" and the user can choose a direction/iso curve to maintain accurate scale on.

An object could also be unwrapped based on converting it to a mesh. This is how UV textures work.

Kevin

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