Surface-line intersection not working unexpectedly

Hey guys

I'm trying to find the intersection point between a surface and a series of lines. It's worked for many similar sets of lines and surfaces, but for some reason with the case I'm posting a large portion of the lines aren't intersecting, clustered around the highest part of the surface. The lines definitely go through the surface, so I'm stumped. Any ideas why this might be?

If it makes a difference there's a larger script before and after this, including the generation of the lines. I've just isolated the problem part here because the whole thing is pretty messy.

Thanks

Matt Johnson

Attachments:

surface line intersection.gh, 483 KB

Replies to This Discussion

Permalink Reply by Hengameh on December 12, 2015 at 9:52pm

Hi,

it is for you...

Attachments:

surfacelineintersection.gh, 483 KB

Permalink Reply by David Rutten on December 13, 2015 at 7:10am

Yup, seems like a bug. Since your curves are long enough, you can switch to Surface|Curve or Brep|Curve intersections instead, they work as expected. I'll try and find the problem with Surface|Line.

Permalink Reply by Matthew Johnson on December 13, 2015 at 11:57am

Thanks!

Permalink Reply by David Rutten on December 17, 2015 at 9:23am

The problem is with a bug in our BrepFace boundingbox calculator. It sometimes returns a box that is too small. I've kinda sorta fixed this by just growing the box for this specific component, but ultimately the fix will have to come in the form of a Rhino SDK improvement.

Permalink Reply by Matthew Johnson on December 17, 2015 at 9:29am

interesting. What's Rhino SDK?

Permalink Reply by David Rutten on December 17, 2015 at 5:38pm

SDK = Software Development Kit

It's basically the part of Rhino source code that everyone (even non-mcneel people) can use. If there's a bug in this part of the program, every plugin developer who uses that code will 'inherit' the bug. However fixing it in Rhino core will also by extension fix it everywhere else.

RSS