Mesh Difference problem

i am having some problems with Mesh Difference. i am trying to cut some holes (tower building outlines) in a mesh.

i am just trying to subtract the towers from the ground mesh (which is the delaunay mesh). but instead of cutting out the tower outlines, i end up getting the reverse. i had the same problem the other day trying to cut mesh spheres out of a mesh with thickness but after i repositioned the mesh spheres, i managed to get the holes cut out properly. this time round, i have played around with repositioning the towers but still can't get it to work. i have already turned the tower outlines into mesh and given them thickness.

i have tried flipping the mesh, can't work either. i have also tried giving the ground mesh thickness before using Mesh Difference.

hope someone can shed some light.

Replies to This Discussion

Permalink Reply by Giulio Piacentino on September 30, 2011 at 3:51am

A question based on the picture:

would you not want to make the Delaney mesh thick before using it for subtraction?

Just a guess...

Permalink Reply by Puay Khoon YEO on September 30, 2011 at 6:28pm

the delaunay mesh is working fine until the subtraction kicks in.

Permalink Reply by Giulio Piacentino on October 1, 2011 at 2:05pm

Mh, what I mean is: for the boolean subtraction, could you try using two closed meshes?

A Delaunay mesh is usually open, so it is more difficult to use it with subtraction from something closed.

Delaunay

Permalink Reply by Puay Khoon YEO on October 2, 2011 at 10:04pm

it didn't work when i made the delaunay mesh into a basic mesh. but when i gave the mesh thickness and flipped it, it worked. the problem is i don't want to give it thickness at this stage, as it will mess up my geometry later on.

how can i subtract holes from a flat mesh without thickness?

Permalink Reply by Giulio Piacentino on October 3, 2011 at 8:05am

Mesh Split is available in Grasshopper 0.8. The tricky part is then to select the part that you are interested in.

- Giulio
_________________
giulio@mcneel.com
McNeel Europe

RSS