Why is this shape not closed?
If I understand correctly you have 2 sketches with lines in both. You can not make a closed profile with curves in different sketches, in this sort of situation you'll need to use project include 3d geometry so all the curves are in the same sketch.
Mark
Mark Hughes
Owner, Hughes Tooling
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What if you had 10 sketches on the XY plane with lots of overlapping curves? If it worked the way you want you'd have all sorts of closed profiles generated between the sketches and it would be a nightmare.
After reading a few of your posts are you sure Fusion's the right program for you, you seem to want to fight against the way it works. Fusion works pretty much the same way most solid modelers work and have worked for 25+ years, it's not new. It sounds like you are used to Autocad or Rhino, they work differently plane and simple, if you try and make Fusion work like those sort of programs you're just going to get frustrated and waste time. An analogy for you, it's like you've moved to a foreign country and you're complaining everyone's driving on the wrong side of the road and speaking the wrong language but it's not them it's you!
Mark
Mark Hughes
Owner, Hughes Tooling
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@Anonymous wrote:
Lol Mark, this is how engineers work, we discuss things and from those discussions come solutions and enhancements.
True. In this case it would not be an enhancement though!
The sketch engine has to perform calculations whether a sketch is closed. These calculation only need to be done when actively editing a sketch.
If the sketch engine would also need to show a closed profile outside of editing a sketch it would have to continuously re-evaluate every sketch and every possible connection between every sketch. That would induce quite a performance penalty.
Accepted solution
to add to what @HughesTooling and @TrippyLighting said, I'll offer one other reason why region detection is limited to a single sketch: To allow you to segregate regions by sketch.
A sketch is really just a container of curves and points. This allows you to create groupings that make sense to you. If you want all those lines to participate in regions, why would you not want them in the same sketch?
The performance point that Peter makes is a good one. If Fusion had to look around at other sketches to do region detection it could get quite expensive, and lead to failures. Consider this case.
Start with a simple sketch:
Extrude the results, and create one sketch on one face:
Create another on the other face:
If Fusion supported this kind of region detection, the overlap of those circles would be a valid sketch region:
And you could, for example, Extrude it. But, if you go back and edit the original sketch so that those faces are no longer coplanar:
then Fusion would have to figure that out, by looking at each sketch in the entire design, and reject those that are not coplanar. It would be quite expensive:
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Anyway, this is a good discussion, and I want to encourage more of these kinds of discussions.
Jeff
Jeff Strater
Engineering Director
@Anonymous wrote:
A major difference with Fusion 360 is that if the program does not recognise the shape as a closed shape then it cannot be extruded.
Whereas with the program I used for the screen shot did not recognise the shapes as closed but the shapes could be extruded or used to create a surface by individually selecting a set of curves with the shift key.
You can use curves from different sketches and even edges to create a patch in the patch workspace then thicken.
Mark
Mark Hughes
Owner, Hughes Tooling
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