Cannot fully constrain simple sketch

[christian_harwood]

I have an extremely simple sketch that I'm not able to fully constrain. Here's a recording of creating the sketch in a new design:

I'm not able to drag the unconstrained line, or add any additional constraints.

[kacper.suchomski]

Hi

Is there a lock next to the sketch icon in your browser?
If so, it's just a graphical error.
If not, please attach your file.

[Drewpan]

Hi,

I have followed your video exactly and mine is fully constrained. Why do you

believe it is NOT constrained? There are two different coloured lines on the

two Construction lines but that is an artifact that occurs because one was the

line you selected to put the Midpoint constraint to the Origin. The Lock Icon

says the sketch is fully constrained. You can make both of the construction

lines the same colour simply by selecting and unselecting one or both. The

Lock Icon is the most important thing here, not the different coloured lines.

Cheers

Andrew

[christian_harwood]

The lock icon is not shown, so it doesn't appear to simply be a graphical error. I'm not able to upload the file at the moment, but it should be easy to reproduce.

[TheCADWhisperer]

@christian_harwood 

Worked fine for me.

Can you File>Export your *.f3d file to your local drive and then Attach it here to a Reply?

[kacper.suchomski]

---

@christian_harwood wrote:

The lock icon is not shown, so it doesn't appear to simply be a graphical error. I'm not able to upload the file at the moment, but it should be easy to reproduce.

---

I wouldn't ask for this if it were easy to recreate.

[christian_harwood]

@TheCADWhisperer @kacper.suchomski @Drewpan Here's a file containing the problem.

[TheCADWhisperer]

@christian_harwood 

Wow, that is a strange one.

I can reproduce the issue with your file, but my file works fine.

Can you reproduce the issue in a New File?

[kacper.suchomski]

The file appears to be corrupted.
It's missing one constraint (not required from a logical perspective), but it can be fully constrained by adding a perpendicular or coincident-to-origin constraint.
But that's a file error.

If you create a new file everything should work.

[christian_harwood]

@TheCADWhisperer @kacper.suchomski I've tried in a new file after restarting Fusion and still have the same issue:

For reference: I'm running Fusion version 2604.1.25 x86_64 on Windows 11 Pro 24H2 build 26100.6584.

[davebYYPCU]

Bug appears to be the order of operations.

Same as the movie, with one of the construction lines, set midpoint to Origin, all 5 articles are black, 

then draw the last construction line, works as expected, here.

(I use Centre rectangles for this result.)

Might help....

[christian_harwood]

I think something is seriously wrong with the constraint solver in my version. Minor changes to existing sketches such as adding a new fully constrained point cause half the sketch to become unconstrained. It also seems to be highly reliant on order of operations - when adding a dimension, it will be fully constrained if I click point A then point B, but if I reverse the order it will have errors.

[davebYYPCU]

Same version here, does not happen to me.

[billbedford]

No, the two construction lines were never constrained together. They were constrained to having equal lengths. To constrain their midpoints together the MidPoint (triangle) constraint should have been used. 

[billbedford]

Depending on the place in the point stack each of the line's centres occurs, there is a 50% chance that the coincident constrain will link both lines with the origin point. 

[johnsonshiue]

Hi! The issue seems to be related to the coincident constraints. If I add sketch points at the intersections, the sketch will be fully constrained. But it is puzzling to me, why coincident constraints were not added appropriately.

Many thanks!

[davebYYPCU]

In the movie, the last construction line has not been associated to the Origin.  It should be black, because it can’t be moved..

Centre point rectangles come with the coincident point at the intersection of the construction lines.

Its order of operations bug, this actual construction, order - highlights why no one has found it before. (Equals on the construction, and not the boundary) (Most would set boundary midpoints, horizontal vertical, without those construction lines)

Might help….