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"up to next", what causes this?

Question asked by Vahid Mostofi on Aug 18, 2016
Latest reply on Aug 20, 2016 by Tateos Tvapanyan

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Hi,

I have a simple part attached, when I extrude my sketch using "up to next" from a plane, inside the solid (i.e. intersects the solid), it extrudes properly to all the faces in its path and not ignores them, however when I extrude the sketch from some plane outside of the solid, SW ignores all the faces in its path except the one on the back.

I know it's not a bug, and it has something to do with how "up to next" works, but I can't think of any good explanation that convince me. So my problem is not modeling it the way I want, just want to know what exactly is the reason for this.

Thanks,

Vahid,

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John Stoltzfus Aug 18, 2016 2:45 PM

lol - learned something new today -

You need to select up to surface first as Up To Next isn't in the dialog box

and only after you edit the Extrude Feature does the Up To Next show - and that gives you two different results

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Tom dunn @ John Stoltzfus on Aug 18, 2016 3:05 PM

I messed with this also. If I take the bottom line of your sketch and move it to just above the surface of the original model then the sketch will extrude the same through the part with no other changes. If I move it back below the surface it behaves like in your pictures. But I am not sure why.

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Vahid Mostofi @ Tom dunn on Aug 18, 2016 6:44 PM

Yes Tom,

I modified the sketch a lot too and got different behavior with small changes, then I got very mad, because I couldn't reach to a conclusion on how this works exactly and what's the rule? and this frustrates me, I want to know the exact reason when I'm learning something.

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Vahid Mostofi @ John Stoltzfus on Aug 18, 2016 6:44 PM

Thank you John,

I think I was not clear in my question, I think "up to next" appear only if you have solids in the direction of extrusion; that's no problem, (so if it's not on the list we can just change the direction).

My question was why I get two different results using "up to next", when I start my sketch from different places (first when sketch plane is inside the solid and second when it's outside).

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Tateos Tvapanyan Aug 19, 2016 3:54 AM

It's not about is the start plane is in the solid or not, only.

It's more about end condition.

Did the extruded body intersect only one face or intersect joined faces?

It follows the same logic when cutting it.

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Vahid Mostofi @ Tateos Tvapanyan on Aug 19, 2016 7:44 PM

Tateos,

My sketches for that extrusion are identical in both cases, all I did was flipping the offset in Plane1 property manager, and I the extrude intersect joined faces on its path.

Can you try your last picture with exactly the sketch that you used in your 2nd picture?

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Tateos Tvapanyan @ Vahid Mostofi on Aug 20, 2016 3:27 AM

Vahid,

I have done this on picture 3.

I can understand you confusion.

But the behaviour depends on conditions.

That is what I tried to show you with pictures.

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7 Replies

John Stoltzfus Aug 18, 2016 2:45 PM
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lol - learned something new today -

You need to select up to surface first as Up To Next isn't in the dialog box

and only after you edit the Extrude Feature does the Up To Next show - and that gives you two different results
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- Tom dunn @ John Stoltzfus on Aug 18, 2016 3:05 PM
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  I messed with this also. If I take the bottom line of your sketch and move it to just above the surface of the original model then the sketch will extrude the same through the part with no other changes. If I move it back below the surface it behaves like in your pictures. But I am not sure why.
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  - Vahid Mostofi @ Tom dunn on Aug 18, 2016 6:44 PM
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    Yes Tom,
    
    I modified the sketch a lot too and got different behavior with small changes, then I got very mad, because I couldn't reach to a conclusion on how this works exactly and what's the rule? and this frustrates me, I want to know the exact reason when I'm learning something.
    Like • Show 1 Like1
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- Vahid Mostofi @ John Stoltzfus on Aug 18, 2016 6:44 PM
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  Thank you John,
  I think I was not clear in my question, I think "up to next" appear only if you have solids in the direction of extrusion; that's no problem, (so if it's not on the list we can just change the direction).
  My question was why I get two different results using "up to next", when I start my sketch from different places (first when sketch plane is inside the solid and second when it's outside).
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Tateos Tvapanyan Aug 19, 2016 3:54 AM
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It's not about is the start plane is in the solid or not, only.
It's more about end condition.
Did the extruded body intersect only one face or intersect joined faces?
It follows the same logic when cutting it.
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- Vahid Mostofi @ Tateos Tvapanyan on Aug 19, 2016 7:44 PM
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  Tateos,
  
  My sketches for that extrusion are identical in both cases, all I did was flipping the offset in Plane1 property manager, and I the extrude intersect joined faces on its path.
  Can you try your last picture with exactly the sketch that you used in your 2nd picture?
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  - Tateos Tvapanyan @ Vahid Mostofi on Aug 20, 2016 3:27 AM
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    Vahid,
    I have done this on picture 3.
    I can understand you confusion.
    But the behaviour depends on conditions.
    That is what I tried to show you with pictures.
    Like • Show 1 Like1
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"up to next", what causes this?

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