Split body bug - changes to splitting tool break the timeline

[jeremiahrose]

Hi there,

I have been having a recurring problem with the split body tool. Please see the attached f3d file for an example - this is a simplified example of the bug, but the problem is occurring in more complex assemblies, too.

I am using a sketch to define a cutting tool, splitting a body based on the sketch, then creating components from each half of the split body. However, when the sketch is changed in certain ways, the split body feature turns red and fails to compute. Editing the feature and simply clicking OK without changing anything removes the error, which indicates that it should not have been an error in the first place.

In large assemblies this problem is completely disabling, as the tiniest changes in cutting tool lead to unnecessary and extremely time-consuming rework of the timeline. This, among many other similar errors, makes the Fusion 360 timeline extremely fragile and extremely unpleasant to work with.

Steps to reproduce the bug:

1. Open attached f3d file

2. Edit Sketch 2 (the cutting tool)

3. Add a fillet to the corner of the sketch and click "Finish sketch"

4. Split body feature is now red with a "Compute failed: No intersection between target(s) and split tool"

5. Notice that there is, in fact, an intersection.

6. Right click on the split body feature in the timeline and choose "Edit feature"

7. Notice that the cutting tool has been automatically updated as it should be

8. Click OK without changing anything

9. Notice that the error has now disappeared

Are there any known workarounds for problems like this, or general ways to prevent the timeline from frequently breaking?

[YoavFriedlander]

I am not sure it is a bug. When creating a fillet in the sketch you added lines that probably rename sketch features - essentially part of parametric design includes re-computing after changes when references are lost. If it was unable to compute otherwise it should have been marked as a bug.

Every line in a sketch has an ID in the back end. When you add a fillet it probably changes the definition in the sketch that was used to identify the splitting tool. That is why after computing again the problem is resolved 

[jeremiahrose]

The reference was not lost. When the split body feature is edited, the reference is there. Fusion 360 is reporting an error when there is no error. This is a bug, pure and simple.