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'Too much geometry' with Linear Pattern

simon_dsimon_d Member Posts: 6 ✭
edited May 2016 in Community Support
I'm trying to model an architectural walkway mesh using the linear pattern tool to repeat a drawing but I get an error message ' This pattern would create too much geometry' can anyone suggest a way around this? 



Answers

  • shashank_aaryashashank_aarya Member Posts: 265 ✭✭✭
    @simon_d It would be nice if you mention how many instances you want to pattern along both directions. 
  • simon_dsimon_d Member Posts: 6 ✭
    Hi @shashank_aarya It is repeated 29 times in one direction and 55 in the other so 1595 instances.
  • NeilCookeNeilCooke Moderator, Onshape Employees Posts: 5,718
    Try making a smaller subset of the pattern as a part, then pattern the part.
    Senior Director, Technical Services, EMEAI
  • jakeramsleyjakeramsley Member, Moderator, Onshape Employees, Developers, csevp Posts: 661
    Sketch patterns are capped by the total number of sketch entites that are created.  In other words, if you pattern 4 lines you can have a higher instance count than if you pattern 8 lines.  I would try removing non-essential instances from the pattern, breaking it up into different patterns, or try doing a part/face pattern instead.
    Jake Ramsley

    Director of Quality Engineering & Release Manager              onshape.com
  • shashank_aaryashashank_aarya Member Posts: 265 ✭✭✭
    @simon_d In general it is a good practice to make a pattern of feature rather to pattern sketch entities because it is easier to edit the directions, number of instances of feature pattern than sketch pattern. When sketch of the feature is edited, it automatically reflects to other instances when feature pattern is done which will not happen in sketch pattern. So, I would also like to suggest feature/face pattern as suggested by @jakeramsley
  • ilya_baranilya_baran Onshape Employees, Developers, HDM Posts: 1,217
    Just keep in mind that feature patterns are slower than body and face patterns, so if you don't need the feature pattern flexibility for a large pattern, prefer a body or a face pattern.
    Ilya Baran \ VP, Architecture and FeatureScript \ Onshape Inc
  • alex_ryanalex_ryan Member Posts: 6 ✭✭
    Why is this an issue at all?  I am trying to make a nest of 100 small parts for waterjet and it just says no.  It would let me make 18 parts at a time.  I could see this limitation on free hobby software but not a pro platform I'm paying $100/month to use. 
  • Frank_BertucciFrank_Bertucci Member Posts: 13 PRO

    Onshape seems to struggle with high volume patterns. I did manage to get a pattern to generate by using the strategy above (make smaller pattern in sketch and then use a feature pattern to replicate), however it grinds the program to a halt. It's about 2-3 minutes for the regen time and any time you make a change upstream of the patterned feature you just sunk another couple minutes:

    image.png

    Need these for perforated sheetmetal parts, looks like we'll need to punch out to AutoCAD for these

  • _anton_anton Member, Onshape Employees Posts: 413
    https://forum.onshape.com/discussion/comment/106117#Comment_106117

    Feature pattern is relatively slow. I bet a face pattern will be more efficient, or at least make a negative part and pattern-subtract it.

  • jeffrey_hawkinsjeffrey_hawkins Member Posts: 9 EDU

    I just ran into this. I'm surprised. I made a flyswatter a few years back, with a giant hexagonal pattern. Yeah, it took minutes to render, but it worked. Now I'm trying to make a grid of squares composed of about 5000 lines, which would be 10,000 points. And/or 10,000 triangles.

    Yeah, that sounds like a lot to process to a human, but a modern high end video game processes millions per second. Anyway, I'd much rather wait 2 minutes for something to work, than just be told "nope".

    Does anyone know what the limit is, so I can most efficiently try to work around this?

  • eric_pestyeric_pesty Member Posts: 1,953 PRO

    One tip for working with things like this that are mostly "cosmetic" is to leave it suppressed until you are ready to produce a final drawing and/or export.
    It also helps to create a configuration so you can use the "simplified" version in assemblies etc most of the time until you really need to show it

  • Cary_BettenhausenCary_Bettenhausen Member Posts: 45 PRO
    edited November 5

    Make sure the perforations are "through all", not "up to next". This saves a lot of regeneration time.

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