Going mad: catenary "collision" with ground mesh

Grasshopper Kangaroo
#1

Hello, hope anyone can give me support.
I’m trying to model a mooring line fixed, at one end, at the bottom of a lake, and, at the other end, attached to a moving floating pontoon. I could simulate pretty easily the mooring line as a catenary in kangaroo and the moving floating platform. The problem is that i can’t figure out how to model the slack catenary laid on the bottom of the lake, I mean the catenary intersects the ground mesh. I was trying to use solid point collide but i cannot get it correctly done with the catenary. Maybe the solution is simple but i’m very new of GH and Kangaroo2

Please help will be really appreciated

#2

Upload your files to start the discussion.

#3

catenaryfloor.gh (15.3 KB) If you just want to collide with a flat horizontal plane, you can do this with Floor like this:

image
image1079×361 98.7 KB

If instead you want to drape over a mesh, you’ll need to make it into a closed solid first.
Here’s an example made by extruding a heightfield:

image
image1395×447 89 KB

catenarylandscape.gh (534.5 KB)

2 Likes
#4

Hello Daniel,
Thanks for the quick reply. This is indeed what i needed. I’m going to try this with my specific case. Thank you very much for the excellent information of the forum

#5

Hi there, interesting problem, i see daniel solved it for you, i would like to have a look at your solution with the moving barge as well, since i am currently working on a similar type of problem. would you mind sharing your files? thanks in advance

#6

Hello Eric,

I apology for the late reply, find please attached my “experiment”,

Mooring line + platform_v0.3dm (40.1 KB)

Mooring line + platform_v0.gh (41.1 KB)

#7

Thanks, wonderfull