Manage lost projections not very smart

[ltomuta]

Say I have an xref-ed component and two sketches on which this component (well, its body) is projected.
Now I replace the component using the Replace Component command.

I find it strange that I then have to go and explicitly tell Fusion how to fix the projections on the sketches by pointing the old Body1 to the new Body1 of the Component1. Can't Fusion work it out that the new Body from the new component is the replacement for the old Body from the old Component?

But even more perplexing is that after I manually repair the broken projection links from Sketch1 I have to do the same on Sketch2 because Fusion can't figure our that Body1 from Sketch1 is the same as Body1 from Sketch2.

[TrippyLighting]

Fusion 360, or any other software does not "recognize" any particular shape. All it knows is data structures, indices etc.

To your visual system (eyes, neocortex and other parts of the brain) the shapes look the same or similar enough. 

A computer does not have that sort of shape recognition (yet).

[ltomuta]

That's exactly why I expect it to replace _all_ references to data
structure "component1.body1" with "new_component1.body1" _everywhere_ . In
one go. Without asking me again what should use as a replacement for body1.
Because it should know already. I told it twice. Once answering explicitly
exactly this question, for sketch1.

[TrippyLighting]

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@ltomuta wrote:
...Once answering explicitly
exactly this question, for sketch1.

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I agree that the referenced between the sketches should update automatically.

@Phil.E do you agree ?

[Phil.E]

I'd have to see the design. I'm going to first point out that the second sketch is looking for a projection that no longer exists, data-wise. All the new lines projected from the "new body1" are new lines. Not the same lines with a different parent/source.

[jscott6SWZG]

yup sometimes the delete option won’t even work

the geometry is still in the bodies and drawings. Cause most often it still shows on the screen