topic Re: Coincidentally Constrained Sketch Elements DISASSOCIATED in Fusion Design, Validate & Document Forum

Coincidentally Constrained Sketch Elements DISASSOCIATED

mavigogun — Thu, 24 May 2018 01:19:33 GMT

Hi Folks.   Got a weird one:

In the Sketch environment, viewed perpendicular to the Sketch Plane, the area enclosed by a spline is demarcated by an area of colour offset from where the spline is indicated- that is, the indicated area varies in placement to either side of the spline.   Strange?   Sure.   Typical?   Maybe.   The visualization being a convenience, I can deal with the discrepancy.

But wait- there's more!   A line drawn coincident to that spline is displayed as completely offset- the end vertex of the line touches neither the spline nor the coloured area indicator!   When the constraint is rolled over, both the spline and vertex illuminate to indicate the coincident relationship.   See the attached screencast.

How can one successfully employ Fusion 360 under such a condition?   No rhetorical question, that- I'm looking for either solutions enabling accurate display of sketch elements or a work philosophy that prevents such aberrations from causing work flow dysfunction.

Re: Coincidentally Constrained Sketch Elements DISASSOCIATED

laughingcreek — Thu, 24 May 2018 01:15:31 GMT

dont see a screen cast

Re: Coincidentally Constrained Sketch Elements DISASSOCIATED

mavigogun — Thu, 24 May 2018 19:12:58 GMT

Follow up: does this relate directly to generation of error "rails do not intersect all profiles" when attempting to loft?

Re: Coincidentally Constrained Sketch Elements DISASSOCIATED

TrippyLighting — Thu, 24 May 2018 22:15:51 GMT

There are certain sketch functions I have learned to totally avoid. One of them is the fix constraint as there are several bugs associated with it. On of which I reported myself.

I believe this is buggy behavior.

Re: Coincidentally Constrained Sketch Elements DISASSOCIATED

jeff_strater — Fri, 25 May 2018 13:46:34 GMT

@mavigogun, can you share your design? It is not clear what the distance scales involved in your screencast are. The Fusion sketch solver, like any mathematical library, works with tolerances. I think the default setting for the tolerance is e-6. If the distance in your screencast is less than this tolerance, then this is a "correct" result. If it is larger, then yes, this is a bug.

(disclaimer: I viewed the video during a meeting in which I was supposed to be paying attention, so I did not hear the sound, apologies if there is valuable information in the sound track).

Re: Coincidentally Constrained Sketch Elements DISASSOCIATED

mavigogun — Fri, 25 May 2018 17:51:07 GMT

@jeff_strater wrote:
It is not clear what the distance scales involved in your screencast are. The Fusion sketch solver, like any mathematical library, works with tolerances. I think the default setting for the tolerance is e-6. If the distance in your screencast is less than this tolerance, then this is a "correct" result. If it is larger, then yes, this is a bug.

I'm sure scale is the factor- I was zooming in attempting to find the ever-elusive no-contact/G1 error thwarting lofting. Thanks looking.