Hello,
As seen in this link: https://3mf.io/beam-lattice-extension/#part1
.3mf format which is available in Rhino enables the ease export of lattice structures without meshing and ultimately saving file size and keeping accuracy.
Is it possible to know how this format can be used. I generate lattices using Grasshopper and I am not sure how to use this format, especially that you have to bake the grashopper file before exporting it in rhino.
Kind Regards,
@tim perhaps you can shed some light on this topic
The 3mf format has nothing to do with Grasshopper. As you noted, it is one of many formats Rhino can use to export geometry. The exported file is then used as input to some other piece of software for either further development or actual production.
I don’t know what the precise nature of 3mf files is, but I do know they can be used by software that generates toolpaths for production machines such as 3D printers, milling machines, laser cutters,etc. The STL format is also commonly used for this same purpose, but requires a much larger file to represent the same geometry.
Rhino has the ability to output any of it’s numerous Export formats regardless of how the geometry is structured in Rhino; it can be either meshes or NURBS or a combination of both. I’ve created 3D printed parts from STL files comprised of both NURBS and mesh geometry. For some reason it seems that Rhino can export geometry faster if NURBS geometry is converted to mesh first, but I really have no idea if this is always true.
Thank you @DavidLeon and @Birk_Binnard.
After baking, the mesh or the nurb can be exported to .3mf instead of .stl which is good because of the how small the size is compared to .stl.
On top of .3mf, I am interested by the .3mf Beam lattice extension explained here https://3mf.io/beam-lattice-extension/
It seems that this extension gives the possibility to export lattices curves while saving information on their truss diameter without meshing them, hence being more accurate than stl files and saving more space.
I am wondering if this extension is available in rhino and if so how it can be used.
Thank you,
This is not available in Rhino. Neither is, for example, assigning a printing material.
As far as we can tell, this format is still only being used by a few researchers. It would be interesting to hear if that is not the case.
Hello,
Is there any update about this topic?
Many Thanks
This is interesting!
I thought *.3mf was human readable but when I look at these example files in an editor I can’t read a thing…
3mf-samples/examples/beam lattice at master · 3MFConsortium/3mf-samples · GitHub
They’re compressed. Change the extension to .zip and unzip. The uncompressed contents are human readable unless the file(s) were binary before compression (like image files).
Thanks I’ll give it a try.
I was able to look at the *.model file after unzipping but the *.3mf file does not open in any viewer or GrabCAD app?
3mf-samples/examples/beam lattice/pyramid.3mf at master · 3MFConsortium/3mf-samples · GitHub
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The 3mf format is a compressed format, and the importer is probably expecting to unzip it, so try opening it without any mods.
My guess is that there is not a whole lot of support for the beam lattice stuff. I know our importer currently doesn’t do anything with it. We could make each beam an extrusion, they’re just cylinders, but that’s not very useful as far as I can tell. If you think I’m wrong let me know. I’m not sure how hard it would be to hook up but I suspect it wouldn’t be too bad.
I tried with the unmodified file… didn’t work.
Nevermind, I have no used case for the beam lattice. I just found it interesting.
I used *.3mf for a multi material 3D print and that worked fine.
OK. I just remembered too that we use 3mflib to read those files, rather than our own code, and the beam lattice stuff is an extension so it’s probably a lot more effort than it’s worth.