topic Re: Another Sketch Solver Bug in Fusion Support Forum

Another Sketch Solver Bug

wmhazzard — Thu, 06 Jul 2023 14:47:03 GMT

Here is another bug with the sketch solver not recognizing a fully defined sketch. Is anyone ever going to go through the sketch solver and fix bugs?

I started with an Overall slot and added dimensions where I needed them and it doesn't see that is is fully constrained.

Re: Another Sketch Solver Bug

TheCADWhisperer — Thu, 06 Jul 2023 16:05:03 GMT

@wmhazzard

Works fine for me (when properly dimensioned).

Re: Another Sketch Solver Bug

wmhazzard — Thu, 06 Jul 2023 16:51:50 GMT

My sketch is dimensioned properly for my application.

Since you don't understand that, here is the complete sketch where I know the overall length and the center locations but not the width.

Re: Another Sketch Solver Bug

HughesTooling — Thu, 06 Jul 2023 17:04:58 GMT

It's not a good layout or efficient set of constraints (not your fault I know). It should solve but with the tangent and midpoints driving the 2 parallel lines it's harder to solve.

If you delete the 2 midpoint constraints on the 2 arcs, then add 3 coincident constraints it is a lot more reliable.

3 coincident constraints where the arrows are. To me a good layout of constraints is like pulling the sketch together with a piece of string, a bad setup is like trying to push with a piece of string!

Re: Another Sketch Solver Bug

TrippyLighting — Thu, 06 Jul 2023 19:15:48 GMT

Yes, a different set of constraints and dimensions might not result in this buggy behavior, but this is clearly a bug. The sketch cannot be altered by dragging around on elements. @Phil.E

Re: Another Sketch Solver Bug

Phil.E — Thu, 06 Jul 2023 19:30:26 GMT

Thanks @TrippyLighting I'll add this one to the backlog. Just like the many others that have been solved in the past, each is unique according to the geometry. Glad to log them as you find them. If you have any other examples at this time please let me know.

(ref: FUS-133657)

Re: Another Sketch Solver Bug

wmhazzard — Thu, 06 Jul 2023 19:35:09 GMT

@Phil.E

I only tried using the slot feature to try and simplify my sketch but it had the opposite effect. Usually I used lines and circles and a circle tangent dimension for the overall dimension but I have found that buggy as well if something is changed, the dimension can end up on the inside of the circles instead of the outside. I suppose a construction line for the overall length as well as the center dimension would be stable except you get one line on top of another.

It also does solve correctly under the hood so to say as any more dimensions brings up the over constrained box, it just doesn't display correctly which happens over and over in sketches.

I have seen symmetry, mirror and now midpoint constraints all can cause problems if used in certain ways.

Re: Another Sketch Solver Bug

Phil.E — Thu, 06 Jul 2023 21:17:30 GMT

Let me know if you find any more that are this easy to describe. These cases require examples. Thanks for posting this one here.