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Construction Geometry not Acting Like Construction
jeffrey_hawkins
Member Posts: 22 EDU
Is it intended behavior that when I 'Use' as 'Construction', that the resulting geometry behaves like normal geometry? Extrudes for example, are confined by it. At first, I thought this was picking up the face of another hidden part. But transforming that part to move it out of the way before the extrude doesn't change the behavior.
https://cad.onshape.com/documents/f40d28ab09c7accec33cadae/w/3e3f0b50813a19add9157466/e/6cb87013ca87be04cfd8d4e8
Here is a project that demonstrates the issue: It's a box lid that should have a touching and attached lip. But the extrude going up is not connected to the lip because the construction geometry is acting like solid non-construction lines for the purpose of Extrusion 2.
Thanks in advance for any info on this.
Comments
If I understand correctly - I think the parts may not be merging due to a small gap that remains after that extrusion - see below
Unemployed Onshaper - operating on European time. More of me here ➤ https://linktr.ee/Liam.G
That's not the problem. As you say, there is a gap there that is preventing the parts from joining. And I could click that region to fix it if the goal was to join the parts. Unfortunately, I am a teacher. And I made this as part of a lesson to demonstrate how regions separated by a construction line are treated as a single region for the purpose of extrudes… So the goal is actually to demonstrate the behavior of a construction line, which is breaking here.
Anyway, that thin region separating the parts only exists because it is split out by a construction line. So for the purpose of an extrude, there should be no separation. It's all one region.
I'm trying to determine if this is a bug (I think so), or is for some reason intended behavior.
Can confirm - you're not crazy. That solid blue wall should not be extruding as it is doing. But I tried to recreate the problem with a sketch of my own, and couldn't use any construction lines for a solid extrude.
Maybe someone else has seen something like this before?
Unemployed Onshaper - operating on European time. More of me here ➤ https://linktr.ee/Liam.G
In sketch 2 before closing, disable imprinting and you're good.
https://cad.onshape.com/documents/c945cdc3c154ca9c3a486eff/w/adca3206e520eefd3b5b9e7f/e/8763ed5f7390e3bdf4c64514?renderMode=0&uiState=6985f4e809eabb65c0904d46
The issue is the sketch automatically included the outline of the reference face you picked (normal behaviour). Has nothing to do with construction. Another outline was created congruent with the construction line.
(You need to re-select the proper face in the extrude after modifying the sketch 2, though)
Interesting. Yeah, you can actually just go into Sketch 2, delete all those construction lines, and nothing changes.
Unemployed Onshaper - operating on European time. More of me here ➤ https://linktr.ee/Liam.G
Wonderful. Thank you!