topic Re: Constraints aren't respected in sketch patterns in Fusion Design, Validate & Document Forum

Constraints aren't respected in sketch patterns

robduarte — Fri, 25 Mar 2016 17:36:38 GMT

Please see this video demonstration. Basically if you create a pattern from sketch curves that have constraints it's likely that the pattern will break soon after. I am having this issue on large scales quite often, but I tried to hone it down to the simplest example I can show. Please let me know if you need more information. Is there something I can do about this or is it a problem/bug with sketch patterns?

https://youtu.be/EZB_Flj0_OE

Re: Constraints aren't respected in sketch patterns

jeff_strater — Fri, 25 Mar 2016 19:01:16 GMT

Yes, that is a bug. As for a workaround, I've been able to get it to update correctly sometimes by forcing a solve, by dragging, or editing a dimension.

We'll take a look and work on a fix.

Jeff

Re: Constraints aren't respected in sketch patterns

robduarte — Fri, 25 Mar 2016 19:23:59 GMT

Great - thanks for looking into it. I'm basically trying to demonstrate, for my students, how to create complex patterns by creating "tiles" of sketch curves but this is making any changes to dimensions or parameters completely ruin the pattern every time. What you described is a workaround -- changing a dimension from "myuserparam" to "myuserparam" and hitting enter causes the whole pattern to recalculate properly. That works fine if you're in the sketch. Of course if you're trying to change a user parameter while NOT in the sketch it's even messier.

Re: Constraints aren't respected in sketch patterns

jiang_peng — Mon, 28 Mar 2016 02:56:31 GMT

This is a known issue logged as FUS-23091. thanks

Re: Constraints aren't respected in sketch patterns

TrippyLighting — Mon, 28 Mar 2016 15:58:51 GMT

In general I'd avoid creating skeatch patterns if the same can be achieved patterning solid bodies, components, or features. Sketch patterns slow down Fusion 360 considerably, while pattering solid geometry still leaves Fusion snappy.

Re: Constraints aren't respected in sketch patterns

robduarte — Mon, 28 Mar 2016 21:06:12 GMT

Thanks @TrippyLighting for the advice. If you have a chance to watch this screencast, maybe you can give me further advice on how to use the solid bodies rect pattern command to arrive at what the Sketch pattern would do for me (if it was working properly). Thanks again... https://youtu.be/zHqCzWW0mqU

Re: Constraints aren't respected in sketch patterns

TrippyLighting — Tue, 29 Mar 2016 01:01:53 GMT

Here is a screencast of of another more "holistic" approach 😉

Unfortunatley it does not completely work, because I think I've discoverd another bug, so actually at the moment we're a little stuck with either aproach.

Here's the bug screencast @jeff_strater

Re: Constraints aren't respected in sketch patterns

robduarte — Wed, 30 Mar 2016 01:05:34 GMT

Hah "haywire" .. same adjective I've used with these patterning problems. I've seen this same bug that you're pointing out. It's almost the same as the other bug that I reported last week, but that was with sketch patterns. So strange that both bugs seem so obvious and trivial - weird that they haven't been detected and resolved already (unless they're new bugs that have just appeared).

Re: Constraints aren't respected in sketch patterns

Anonymous — Wed, 22 Jun 2016 01:58:03 GMT

I've discovered that adding a rectangle pattern sketch results in my sketch becoming NOT fully constrained. Guess I won't be using that tool in my project!!! Back to the old fashioned way of adding sketch patterns.

Re: Constraints aren't respected in sketch patterns

robduarte — Wed, 22 Jun 2016 02:07:40 GMT

I encounter many issues where a sketch that is all black starts showing some curves as blue all of a sudden. I don't think it necessarily means that the sketch is no longer fully constrained, just that the color coding is failing?

Re: Constraints aren't respected in sketch patterns

Anonymous — Wed, 22 Jun 2016 20:03:06 GMT

In my case the sketch pushpin disappears and sketch lines turn blue. I'll create a Scrrencast and post it when I have a chance. I thought I had totally figured out all of the factors influencing "Fully Constrained" sketches that show the pushpin but when I added the rectangle pattern of a 3-Tangent circle using a dimension line as the direction, the Pushpin disappears. Thank for the feedback.

Re: Constraints aren't respected in sketch patterns

Anonymous — Wed, 22 Jun 2016 20:12:05 GMT

I might extrude my sheet metal pattern 1st and then create the drill outs as bodies since Sketch seems buggy

Re: Constraints aren't respected in sketch patterns

TrippyLighting — Wed, 22 Jun 2016 20:40:06 GMT

You might want to export your design as a .f3d and attach it to your next post and/or you could show us in a screencast what is failing.

At east then we have the material to investigate whether to not there's a bug at play.