Why does my part look like this?

michael_mcewen

I've drawn a part in part studio, basically a ring with flanges. It looks correct; all constraints are in order, all lines are black.  After extruding, it looks faceted.  Not sure why.  Any ideas??

Here's the file: https://cad.onshape.com/documents/3dd0f5a01a4f3ab9946cd01a/w/0c76860cd41097ed46076413/e/ca85ec4235c0c526b256e3ec
It's the 9th part down from the top, called TOP CROSS.

brucebartlett

For some reason, the auto is defaulting to very coarsely tessellated. You can now change this with the part appearance. Setting it to "Fine" fixes the issue.

michael_mcewen

Hi Bruce, thanks.  That did the trick.  Probably went to coarse, because I have so many intricate parts in my parts studio.

philip_thomas

@michael_mcewen - yes!
The short answer is that there is a triangle budget for each part studio. Lots of parts = coarser tessellation.
There is actually more intelligence - but for now, assume thats how it works.
The ability to override the tessellation setting is just the first step - more coming!

michael_mcewen

Thanks Philip.  I seem to find myself in this place more and more. I'm drawing whole (light) fixtures, sometimes with hundreds of parts.  I'm using the files to have parts made, but also as client presentations. I often want to show a series of several whole fixtures in assemblies for these presentations. By the time I get towards the end of the process, the program is stalling out completely.  I wonder, am I miss-using the program, or is my work process somehow in error?

https://cad.onshape.com/documents/3dd0f5a01a4f3ab9946cd01a/w/0c76860cd41097ed46076413/e/52d289c17f89335c0973c905

philip_thomas

Oh boy!

Let me see if waving my wand over this helps at all . .   

michael_mcewen

Is that all it takes?!  Thanks Philip!

philip_thomas

Ok, wand has been waved!




Things for you to do.

• Do not model anything other than ONE of each thing in a Part Studio (use assemblies for instancing / patterning)
• Boolean the chain so that you dont have 900 parts
• Build logical groupings of things at each level of assembly (sometimes assembly sequence - doesn't have to be)
• Because the part count is significantly fewer, a much higher level of tessellation is used (your original question)

https://cad.onshape.com/documents/9a78228c55a1d44862542e48/w/23c3997df919ac767a325cb5/e/a15ce866b85fbfd426c5f0f9

I hope this helps

michael_mcewen

Hey Philip, Sorry, I missed your response a few weeks back. This is really helpful. I clearly need to spend more time learning how to navigate my way around in Assemblies. Onshape is my first CAD experience; I'm just a couple years in. I spent just enough time learning to navigate within Part Studio, and drawings to get some work done. But Assemblies is another story!  Example: I have no idea what Boolean means (some kind of broth, right?).

Thanks for the tips!

philip_thomas

@michael_mcewen - Glad to hear it helped.
If you would like a 1 hour primer on Mating Assemblies, here is a webinar i gave last week.

https://www.onshape.com/videos/onshape-assemblies-for-solidworks-users-071018

philip_thomas

Here is some info on Boolean operations

https://en.wikipedia.org/wiki/Constructive_solid_geometry