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Fastest way to tell if a line touches any of a set of faces?

EvanReese
EvanReese Member, Mentor Posts: 3,082 PRO
in FeatureScript
I have a whole bunch of curves, and I want to tell if they touch any selected target faces. I first thought of evCollisions(), but I'm not sure it works with faces and curves (does it?). This is making me lean toward evDistance() and seeing if the distance is zero, which should work, but can anyone recommend something that will perform better? I'm looking for a high-performance solution since this operation could happen hundreds of times.
Evan Reese
The Onsherpa | Reach peak Onshape productivity
www.theonsherpa.com

Answers

  • MichaelPascoe
    MichaelPascoe Member Posts: 2,948 PRO

    I know evCollisions() works with curves and curves so I assume it will work with curves and faces. Not sure how high performance this will be.


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  • GregBrown
    GregBrown Member, Onshape Employees, csevp, pcbaevp Posts: 411 image
    I've actually been doing something with curves and faces and also mate connectors and faces - it's working well. In one test case I checked 300 curves against a spline surface... this evaluates all collisions in 30ms. 
  • EvanReese
    EvanReese Member, Mentor Posts: 3,082 PRO
    ok cool I'll spend more time chasing that one down then. I've not used evCollisions() yet, so I need to learn it.
    Evan Reese
    The Onsherpa | Reach peak Onshape productivity
    www.theonsherpa.com
  • christopher_dziuba
    christopher_dziuba Member Posts: 124 ✭✭✭
    evCollisions is a big part of a lot of the tools I want to make but it seems to me like it only evaluates faces when given solid bodies. How have you been finding it?
  • EvanReese
    EvanReese Member, Mentor Posts: 3,082 PRO
    @christopher_dziuba
    I ended up sticking with evDistance() for it, but it's been long enough that I don't remember if I first tried evCollissions() and it was slower, or I just felt it was good enough as-is.
    Evan Reese
    The Onsherpa | Reach peak Onshape productivity
    www.theonsherpa.com
  • christopher_dziuba
    christopher_dziuba Member Posts: 124 ✭✭✭
    @Evan_Reese
    That's fair. I'm noticing that the featurescript has a bit of a gaping whole with this limitation in being able to evaluate interaction between entities. That being said there's enough there for us to be able to make work-around's for now so I'm working with it.
  • S1mon
    S1mon Member Posts: 4,574 PRO

    I realize this is an older thread, but I'm currently using a bunch of rayCasts to find points on a part where I want to simplify some surfaces. I'm using the resultant points to fit planes to. With say 9 parallel ray casts (a central ray surrounded by 8 radially spaced ones), is that faster than something with evCollisions?

    Simon Gatrall | Product Development, Engineering, Design, Onshape | Ex- IDEO, PCH, Unagi, Carbon | LinkedIn

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