"Manage lost projections" error and function have vanished

[martin3HJUA]

Hi, I've noticed over the past week or so that when updating something in a model which messes up projected geometry in a sketch somewhere, I no longer get any errors (ie the affected sketch doesn't get yellow-flagged).

The only change is that the previous geometry just turns green - and only if I go looking. Right-clicking doesn't offer the option to "manage lost projections". In fact I can't find this function anywhere.

Have I clicked a setting somwewhere to turn this feature off? My version is showing as up to date.

Thanks in advance

[sutherland-]

Hi @martin3HJUA 

This information from Jeff might help:

"The green/fixed geometry is geometry that, in the original sketch was "projected" geometry.  In this case, from the face that the sketch was created on.  When you redefine a sketch, that projected geometry can no longer be resolved (the face it was on is no longer there).  So, Fusion converts that to "fixed" geometry, assuming that you do not want it to move.  If you want this to become "regular" geometry, you can select the whole sketch and "unfix" it."

See attached GIF:

 

[martin3HJUA]

If the projected geometry can no longer be resolved, I'm accustomed to seeing an error which invites me to "Manage lost projections". Are you saying you don't get this if the sketch plane is redefined, rather than, for example, re-building a solid feature from which projections are taken? Since redefining the sketch plane must always be parallel, I don't see how that would cause lost projections?

[sutherland-]

Could you please provide the .f3d file?

[davebYYPCU]

Woah there, Redfine Sketch Plane can be any orientation required, parallel is an option, not default.  Not a recommended process, due to the unpredictable results.

Manage Lost Projections -  will show itself when it happens.  

Might help.....

[martin3HJUA]

Thanks for your reply. My whole post was prompted by Manage Lost Projections NOT being offered automatically in some cases. My colleague has also now experienced lost projections which just show up in green without any ability to right-click and "manage lost projections" or even the sketch getting a yellow warning. Annoyingly, confidentiality means I can't share the cad.

[jeff_strater]

the only case that I am aware of where projected sketch geometry "turns green" (meaning: becomes "fixed") is if Redefine Sketch Plane is used.  That is defined and expected behavior from Redefine.  This is not a "lost projection", and so will not offer Manage Lost Projections.  If a projected curve's source is lost, then the projection will still remain purple (for the default color scheme), will report an error, and should offer Manage Lost Projection.

[HughesTooling · Accepted solution]

@jeff_strater There really should be a warning when you redefine a sketch plane if the sketch contains projected geometry. Better still, as I've brought up before tune this up so redefine sketch plane doesn't break the projections so they can be updated.

In my workflow I know sketching on faces of inserted parts is likely to cause me this problem if the inserted part is edited, so I always add an offset plane to the face then sketch on the plane. If you can redefine an offset plane without any problem (and not break projections) I don't see why sketches on a face are a problem. Why not have an option to convert the lost face into a reconstructed plane like when you export a component that references a plane\face in a different component.

Thanks Mark

[martin3HJUA]

Thanks Mark, I agree completely. With a redefined sketch plane parallel to the original, why wouldn't/couldn't it keep projected geo? At the very least a warning is in order, or offer "manage lost projections" as with other changes. Good workaround too, although requires foresight 😄

[jrychter]

This is terrible behavior. Who thought it was a good idea?

I am looking at a complex parametric design that no longer works, and a number of sketches now have green projected geometry. The design no longer scales correctly, configurations are broken.

Fixing this, as I understand, now involves re-creating every sketch that has those broken projections. Which will cause a host of new issues, because if you so much as sneeze, Fusion breaks all projects from bodies/faces.

This is depressing.

[HughesTooling]

A way to avoid this problem is don't sketch directly on a face but create an offset plane to sketch on. There is an add in here that automates the process. If you lose a reference the plane can be reassociated all projections updated using manage lost projections. Of course this is how reassociate sketch plane should work but doesn't look like it'll get fixed!😞