topic Re: Mesh to body. in Fusion Support Forum

Mesh to body.

m.van.hameren — Thu, 15 Sep 2022 11:55:16 GMT

Hi all,

I'm in the middle of coverting imported meshfiles to body's in fusion.

There's lots of warnings about to many triangles/faces.

So first after checking this tutorial: https://youtu.be/tVGtG-UjlYg it will get me started but it takes a hell of a long time (Fusion warnes me for that). Is al this converting done locally on my computer or in the cloud somewhere on Fusion datacenter?? So will I be better off with a more powerfull PC with more internal memory and high upgraded processor?

Thanks once again for your time. Mark.

Re: Mesh to body.

mzulchDTD74 — Thu, 15 Sep 2022 12:36:34 GMT

First thing i would do is before trying to convert from an STL to a solid check the scale of your model. I have noticed almost always the model is opened in cm vs the mm i would usually design something in. This makes the model 10 times larger than intended. If you scale it down to the correct scale, a lot of times this makes the conversion to solid go a lot smoother. At least this works for me.

Re: Mesh to body.

m.van.hameren — Thu, 15 Sep 2022 13:36:18 GMT

It is in mm, size should stay the same.

Fusion crashes when converting to body.

Re: Mesh to body.

mzulchDTD74 — Thu, 15 Sep 2022 14:02:44 GMT

it does not hurt to double check. mm models open in cm for me. Just an FYI.

Re: Mesh to body.

TrippyLighting — Thu, 15 Sep 2022 16:09:56 GMT

Converting faceted mesh models into Solids is often a bad idea. Can you share the model in original .stl format ?

Re: Mesh to body.

m.van.hameren — Fri, 16 Sep 2022 07:12:48 GMT

Okay, thaks for your time.

Re: Mesh to body.

WHolzwarth — Fri, 16 Sep 2022 08:03:43 GMT

As Peter (@TrippyLighting) already mentioned, only in special cases (further 3D editing) it makes sense.

Here's BREP of this file. Filesize 5766 kB as STL, 33653 KB as F3d.

Re: Mesh to body.

HughesTooling — Fri, 16 Sep 2022 08:41:31 GMT

@mzulchDTD74 wrote:

First thing i would do is before trying to convert from an STL to a solid check the scale of your model. I have noticed almost always the model is opened in cm vs the mm i would usually design something in. This makes the model 10 times larger than intended. If you scale it down to the correct scale, a lot of times this makes the conversion to solid go a lot smoother. At least this works for me.

I guess you're uploading your models through Fusion's data panel, and yes the online translators default to CM. If you use insert mesh Fusion will default to document units and you also have the option to override the units on the insert dialog.

Mark

Re: Mesh to body.

m.van.hameren — Mon, 19 Sep 2022 07:11:07 GMT

Hey,

Thanks all for your reply's.

Ik really need the solid to make a castmold for it which will be printed on a 3d printer. You can't do it when it is still a mesh (sadly enough).

You can make the castmold in meshmaker too, but I want the castmold to be split in two parts (devidable?) and that I want to accomplish in Fusion. The mould itself is actually a silliconerubber flap, now I had to cut the castmold open with an oscillating saw. The flap is used in a medical situation, so needs some care,

Re: Mesh to body.

m.van.hameren — Mon, 19 Sep 2022 07:33:01 GMT

So how did you accomplish this?

greetz, Mark.

Re: Mesh to body.

TrippyLighting — Mon, 19 Sep 2022 09:54:01 GMT

Often the best way to do this in a CAD application is to first re-mesh the triangulated scan data into a quad mesh.

That quad mesh then can be imported into Fusion 360, converted into a T-Spline and then BRep.

the large advantage over a faceted BRep created by directly converting a mesh into a BRep is that the result is not faceted .

I have created this tutorial a few years ago and it has worked many times, although in my current attempt Fusion 360 fails to convert the mesh into a T-Spline it is still worth trying:

Re: Mesh to body.

WHolzwarth — Mon, 19 Sep 2022 10:01:10 GMT

That's only a big deal with respect to filesize.

In Mesh environment -> Modify -> Convert Mesh with Method Faceted. After some time you'll get a BREP with thousands of tiny faces.

With the result a boolean cut could be done versus a solid box. But the real challenge will be parting line creation for the cavity.

Shortly after writing: Peter has been there already.

Re: Mesh to body.

TrippyLighting — Mon, 19 Sep 2022 10:08:24 GMT

Attached is a model with a quad-mesh face count around 20,000, created with the workflow in the tutorial.

That high face count might not be needed to retain the detail of the scanned mesh.

Re: Mesh to body.

TrippyLighting — Mon, 19 Sep 2022 10:11:19 GMT

@m.van.hameren wrote:

Ik really need the solid to make a castmold for it which will be printed on a 3d printer. You can't do it when it is still a mesh (sadly enough).

This can generally can be done entirely using a mesh-only based workflow. It would not NOT involve Fusion 360!

Re: Mesh to body.

m.van.hameren — Thu, 29 Sep 2022 10:01:21 GMT

Working in Meshmaker now to create a castmould.

Thanks for your answers!

Mark.