Rhino 6 reading Rhino 7 Files

Ouch! I’m not sure you heard me at all. A proper file conversion utility would either warn or fail if an R7 file has geometry that can’t be converted to R6.

I choose to stay on R6 because the price of upgrading to R7 is not worth it to me, especially since most of my use of Grasshopper is to offer free support to McNeel customers on this forum. To suggest that I not even ask politely for an R6 version of an R7 .3dm file is frankly rude. It’s also a disservice to new R7 users who don’t know any better and counterproductive to McNeel’s own interest.

Yeah, that’s hard to do well. It’s not going to be a priority for us anytime soon.

Thanks for supporting people. You’re welcome to ask for an old file, of course. But posting old versions of a file should not be a precursor to getting support for our currently shipping product. Please know that I have no expectation that you’d be able to support Rhino 7 users when your only vantage point is Rhino 6.

One year old. You don’t understand.

Mia culpa. Please replace all instances of “old” with “previous version”.

R7 started “shipping” (became official) less than two months ago, yet R6 is already old to you.

Obviously you expect everyone on this forum to upgrade immediately and didn’t anticipate the chaos that would ensue from mixing new R7 users with “old” R6 unpaid support volunteers. That careless attitude takes a lot of the fun out of it for me.

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Wonderful little magician :black_heart: :black_heart: :black_heart:

I´ve ran a few tests. Can confirm that some of the new annotations don´t convert right. But most of the geometry is fine. More than enough for me.

  1. Has this utility (and the person who wrote it) been vetted by McNeel?

  2. Can we be sure it contains no malware?

  3. Why didn’t McNeel produce such a utility of their own?

Prioritization. The same could be (and has been) asked of zillions of potential projects. We’re not infinitely capable, and so we make choices about what to do, and when. As you can see from David’s explorations, the simple solution doesn’t get all the right answers.

In many cases, we need the full power of Rhino to be able to do geometry conversions (for example, SubD to NURBS or mesh). That’s not something we give away for free, and so it won’t be in any free file converter.

The expectations of file converters are high - everyone (including me) would expect 100% fidelity, and a robust report of when that expectation wasn’t met. It turns out that’s a non-trivial project.


I remember installing Pancake because it was claimed to resolve some differences between R5 and R6 but it did nothing for me, so I’m reluctant about this one. Would rather it come from McNeel.

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I can confirm I can see these limitations right now. The good thing for me is that at least for non-complex quick conversions there is already a way. Official or not. I do get Joseph arguments though. This little tool I believe is open, so maybe the community can in time improve it a bit to what is technically possible. Still a good development. But one should really know that there are indeed limitations.

Yep… And I don’t see why the 7 format has no backwards compability. The fact that AutoDesk are resorting to this kind of tactics doesn’t mean that they are worth copying…
Model 1_V6.3dm (12.1 MB)


WRONG McNeel continues to only charge for major upgrades (V6 to V7) which are not annual

Factually correct. In my case, last year I’ve made my company purchase like 6 licenses or so… So for me in particular is kind of anual. Then the WIP for Rhino 8 is ongoing right now and I guess it will be finished by 2022… So…

Close enough. R7 became official only a year after I upgraded to R6 and more major upgrades are on the horizon, including the fabled GH2.

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Do you mean previous versions of Rhino cannot open V7 format files? Do you mean that earlier versions of Rhino cannot open V7 files. Versions of Rhino has never been able to open files saved in subsequent formats. I’m not aware of any software which can open files saved in the later formats.

Rhino V7 can save files in format going back to Rhino V2 format.

Yes, my guess is that there are no great format changes. Since I can perfectly visualise the preview of the Rhino 7 file when I have only 6 installed. So it can indead read the file. It is just prevented from opening it. I might be wrong. Can’t verify the difference. Or maybe there exists a limitation, which I don’t know of.

Then I don’t see why for us, the paying users, and especially those who upgraded to Rhino 6 late, there should not be an access to online file converter. Linked to our accounts. Even SketchUp has that trough the warehouse. I just gave you thousands, and if I have to resort to evaluation versions and so on when my partners and clients send me a later version file, until I make my return on investment and/or the new Rhino version is advanced enough so I have the incentive to migrate… I don’t feel very nice about it, if you know what I mean…

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Well, it appears I just made a jumble of this topic. If we need to revisit this, let’s start a new one.