Problem when projecting curves onto a Brep

Hi there,

I have a problem when projecting the curves of a subdivided surface with grasshopper onto a geometry created in rhino.

The idea is to subdivide a designed geometry into elements of 1000mmx1000mm for further manufacturing. When subdividing the bounding box of the geometry into elements, the projected curves do not project correctly onto the Brep.

When having the surface subdivided into U and V= 2, the projection works fine. When subdividing with U and V = 3 or higher, some curves are not projected. See picture which is attached.

Besides, there is an error in the rounding of the legth of the subdivision. See comment in grasshopper file.

Can someone help me to solve these two problems, because I cannot find the right solution.

Thnx in advance!

Mitchel

Attachments:

Baked versions of projected curves.png, 26 KB
Projection onto brep error.3dm, 78 KB
projection onto brep error.gh, 8 KB

Replies to This Discussion

Permalink Reply by Valentin on October 19, 2014 at 6:45am

You can download the lunchbox. Worked great for your sample.

Attachments:

2014-10-19 15.43.56.png, 313 KB

Permalink Reply by Valentin on October 19, 2014 at 6:57am

Of course you can only use Grasshopper components

Attachments:

2014-10-19 15.55.24.png, 280 KB

Permalink Reply by Valentin on October 19, 2014 at 7:29am

Method 3. Look to file.

Attachments:

2014-10-19 16.26.37.png, 332 KB
projectionontobreperror3.gh, 13 KB

Permalink Reply by Mitchel Janmaat on October 19, 2014 at 12:35pm

Thnx valentin for your reply!

However, my problem is still not solved.

The idea is to subdivide a flat surface into squares of maximum 1000x1000mm and to project these curves on a brep (curved surface). I do not want to divide the curved surface directly in squares of 1000x1000mm because the curvature of the Brep means that the squares in top view are not 1000x1000mm. Do you understand?

That's why I project the curves at the brep. However, the lines are not projected correctly when a subdivision of 3 for u and v is used.

Can you, or someone else, tell me what is going wrong?

Permalink Reply by Valentin on October 19, 2014 at 2:03pm

Check please I am repeir your defination.

Permalink Reply by Mitchel Janmaat on October 20, 2014 at 4:55am

Thnx Valentin!

Sorry, maybe it is a bit stupid of me but I still got this result with your latest version of the script (check attachment). The script is still not functioning with a closed projection of the lines onto the surface. Are the curves closed in your grasshopper version?

Or is it just a bug in my version of grasshopper that it is still not working?

Attachments: