topic Re: Model will not load and takes up almost 40 gigs of memory in Fusion Support Forum

Model will not load and takes up almost 40 gigs of memory

Ole_Holm — Fri, 15 Jan 2021 09:27:24 GMT

I have a model which I soon is quite big, but I have been able to work on it without problems, suddenly I can not load the model. It takes forever and My MacBook Pro tells me that it has run out of memory and I should kill fusion360 (using 38-39 GB of memory)

I have tried to open older versions but it does not help.

What can I do ?

Is there any way to delete history/timeline and compress like "AutoCad purge" ?

Can I export the model "offline" and import it to a new model ?

Ole

Re: Model will not load and takes up almost 40 gigs of memory

TrippyLighting — Fri, 15 Jan 2021 10:45:24 GMT

Can you share more details about the model ?

Can yu open an earlier version o the model ?

What does large mean ? Ho many compones, bodies ? Any mesh geoemtry in it ? Any T-Splines ?

Re: Model will not load and takes up almost 40 gigs of memory

jeff_strater — Fri, 15 Jan 2021 15:38:23 GMT

you can disable design history in the gear icon to the right of the timeline:

but, without more information (preferably the design itself), we can't really offer much more help than that. We could offer some speculation, but that would waste your time.

Re: Model will not load and takes up almost 40 gigs of memory

Ole_Holm — Fri, 15 Jan 2021 19:48:31 GMT

Sorry Has been ofline

Here the public link https://a360.co/35K3RtX

I am running on a 2019 MacBook Pro with 16 GB of RAM

0 components

10-12 bodies

No mesh geoemtry

No T-Splines

Ole

Re: Model will not load and takes up almost 40 gigs of memory

TrippyLighting — Fri, 15 Jan 2021 20:26:31 GMT

This is the message I get when try to download the model. I got this in two attempts about 30 minutes apart.

Are you able to open an earlier version of that design ?

Re: Model will not load and takes up almost 40 gigs of memory

jeff_strater — Fri, 15 Jan 2021 20:59:07 GMT

@Ole_Holm - can you tell us more about these 10-12 bodies, and the design in general? A screen shot, including the expanded browser and timeline would also be helpful. There are some workflows that can generate really resource intensive models, would be good to know what's inside.

@TrippyLighting - I'm trying to export the model anyway. That error is just for the viewable creation. In theory, that is independent of export (though it certainly can be a valuable warning sign, as well).

Re: Model will not load and takes up almost 40 gigs of memory

jeff_strater — Fri, 15 Jan 2021 21:23:15 GMT

also, @Ole_Holm , the fact that the current version won't load may be blocking all this. Can you promote an older version of the design that you think does work? That would help us to investigate, and also may be a way forward for you. You'll lose work, but it still might be preferable to the current situation.

Re: Model will not load and takes up almost 40 gigs of memory

TrippyLighting — Fri, 15 Jan 2021 21:29:01 GMT

@jeff_strater I am not that easily detered. But the email with the actual download link hasn't arrived in then last hour or so 😉

Re: Model will not load and takes up almost 40 gigs of memory

Ole_Holm — Sat, 16 Jan 2021 11:58:47 GMT

Hi Every one

Here is a version vhich is 8 versions older, it can be opened

https://a360.co/3oPpu3f

attached is a screenshot of some of the bodies which I managedes to export as STL before the file became defect.

and a Screenshot.

BR Ole

Re: Model will not load and takes up almost 40 gigs of memory

jeff_strater — Sun, 17 Jan 2021 17:58:31 GMT

Thank you for sharing the model. I think I know what is going on in this model. The technique you are using is what I describe as "direct modeling with the timeline turned on". This is a very expensive modeling practice. I won't go into too many details, but when you do a lot of Combine features where faces merge, the information needed to "track" the merged faces in later modeling features explodes and eventually becomes unmanageable. Even this earlier version of the design is too painful to work with, in my opinion. The file is 350MB on disk, and uses 17GB (that is not a typo) of memory while open.

An example of this "direct modeling with timeline" is here:

this sort of sequence where you split the body, move parts of the bodies, and Combine is the usual pattern I look for when I see these kinds of models. I suspect that a lot of the problems you have center around the brick pattern in the wall - if you are using these kinds of techniques to model that brick pattern, it would explain the issues you are having.

My recommendation would be to switch over to a fully Direct Modeling approach. Parametric modeling is useful, if you plan to go back and edit any of those features and regenerate the design. My guess, just based on what I see in this model is that you don't plan to do that. Even just the few times I tried to reposition the timeline marker in this model showed me that editing would be impractical. So, I tried disabling the timeline and exporting the design. Now, the design is only 20MB on disk, and uses only 5GB of memory when loaded. Some of that is due to the "direct modeling features" in the browser. Exporting the design to STEP and re-importing increased the size of the file to 50MB (STEP is less efficient than native Fusion for geometry storage), but when in memory, it only uses 1GB of memory. You can still use the same modeling techniques as previously, they will just not be capture in the design history.

This is still a very geometry-intensive model, and it will always be somewhat painful to deal with, but you are likely to have a much better experience if you either switch to Direct Modeling, or revisit your parametric modeling plan to avoid this style of modeling.

I've attached the direct modeling and STEP versions of this design for your reference

Re: Model will not load and takes up almost 40 gigs of memory

Ole_Holm — Sun, 17 Jan 2021 21:03:58 GMT

Thanks Jeff.

I am comming to the same conclusion.

When I normally use parametric design it is on completely different modelling tasks and applications, making a 3D model of a huge brickbuilding (to be 3D-printed with the brick structure), based on a small pencil drawing from 1910 has ended up in a strange hybrid way of constructing.

Ole

Re: Model will not load and takes up almost 40 gigs of memory

TrippyLighting — Mon, 18 Jan 2021 14:32:49 GMT

@Ole_Holm wrote:

...making a 3D model of a huge brickbuilding (to be 3D-printed with the brick structure), based on a small pencil drawing from 1910 has ended up in a strange hybrid way of constructing.

This is not the domain of CAD software!

You'd usually use a polygon/sub-d mesh modeling software for this. Blender, Maya, 3DSMax, MoDo. Cinema 4d, Houdini all can deal with enormous amounts of geometry and will have no performance problems with this.