Terrible Performance Trimming Lines

[ARTHUR-HM]

I'm working on a design that has a ton of holes on it. It's a 30" diameter disk. I drew a sketch on one face of it. It has a lot of circles sketched from the center of the disk, and a pie shape drawn on it. I'm trying to trim those circles to the pie shape, but each trim is taking between 5 to 10 seconds to calculate, and it locks up fusion until it is done processing. 

I can't post the model publicly here, but if a developer would like to take a look and I send it their way. I can post this screen shot to hopefully help get an idea of what I'm talking about.

I've tried this on my windows desktop, and a brand new Macbook pro that is pretty beefy. Issues on both machines.

I ran component.count and here was my results:

Component.Counts

With Overrides: LeafOccurrences 1: Bodies 86: VisibleLeafOccurrences 1: VisibleBodies 86: LeafOccurrencesWithVisualMaterialOverrides 0: OccurrencesWithTransformOverides 0

Doesn't seem like much...

You can see in the photo below that I've already done some of the trimming on the left hand side of image. 

Thank you!

[PhilProcarioJr]

@ARTHUR-HM

You would be much better off just making one line of holes going outward then pattern the holes with geometry and not in the sketch.

Also you don't really don't have to trim the lines.

[ARTHUR-HM]

For the holes, that is actually exactly what I did. There isn't an issue with the holes. It's the lines I'm using to extrude the bosses. I also agree that I do not need to trim the lines. That's actually how I went about it. But, at the same time, it should not be that slow to trim some lines. It became unusable slow for a relatively simple drawing/part. So while I was able to make it with alternative methods, and arguably the better method, not everyone at my shop likes to model that way.

They're trying to trim all those lines up and Fusion actually locked up a few times on them and didn't return. I would like to get an idea of why that is.

[HughesTooling · Accepted solution]

Have you used sketch on face so all the holes are auto projected into the sketch? Try creating an offset plane on the face and use that for the sketch and only project in the holes you need.

Mark

[PhilProcarioJr]

@ARTHUR-HM

Currently the sketch solver has a lot of issues with stuff like this. They are constantly improving it but it still has a long ways to go.

Another thing you have to consider is when there are constraints on a line like coincident so on and you trim the line, it adds the constraints to every piece of line geometry so what seems simple to you can actually become very complex fast.

[Beyondforce]

Hi @ARTHUR-HM,

You must think about the AMOUNT of sketches you have per sketch file. Fusion 360 doesn't like complex or massive sketch files. It uses a lot of CPU resources and that's why you feel the performance is going down.

You should divide this sketch file into multi sketch files and it should solve you problem. But since we cannot see the actual file, it is very hard to give you a definitive solution.

Cheers / Ben
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[ARTHUR-HM]

The amount of sketches was actually very small. Which is why I was confused why the performance hit. But the solution provided by @HughesTooling worked great.

I created an offset plane based on the surface of the disk, and used zero for the offset. Then I used that as my sketch plane. Now my sketch plane doesn't have all of the 900+ holes referenced on the plane. Can trim with ease now.

Great tip, thank you @HughesTooling. 

[HughesTooling]

Auto project is my biggest pet hate in Fusion. I try and avoid sketch on face as much as possible because of it or if I do use it the first thing I do is window select everything and delete. For some reason the developers think it's useful and will not give an option to turn it off in preferences.

Mark

[jeff_strater]

@HughesTooling, we do recognize the need for an option to disable automatically projecting the face geometry.  In fact, we were just discussing this yesterday.  It is on the way.  I've lost track of when it will make it out of the release machine, but hang on, it's coming.

Jeff

[ARTHUR-HM]

That is great news!

[jeff_strater]

Even better news:  Found out this morning that this preference is part of the next update.  So, consider it a late XMas present:

Jeff 

[ARTHUR-HM]

Best news I've had all day!