Rhino boolerian difference


#1

hi guys,
i really need your help. i’ve been just hired and they are already asking me something i dont have any idea how to do. my problem is basically i have to subtract and make a difference between a closed solid prismatic (cube) with an open poligonal mesh , like a surface. i’ve tried to convert the mesh into nurbs to use boolerian difference but i doest work. please help me i have to finish this work until next week and perform the setting in front of my boss.
hope someone can help me not to be fired :smiley:


(Mikolaj Jarski) #2

Can you share your file?


#3

Meshes and NURBS are different animals - you cannot combine them. It’s relatively difficult to get something workable using MeshToNurb - it works OK under certain specific conditions but its purpose is not reverse engineering - so your main alternative here is to convert your “closed solid prismatic (cube)” into a mesh and then try using the Mesh Boolean operations (MeshBooleanDifference, etc.). The result - if it works, mesh Booleans are somewhat unreliable in Rhino - will be a mesh.

There is no reason for you to get fired over this, but you might have to explain to your boss that not all 3D representation systems are compatible/interchangeable.

–Mitch


#4

thanks a lot guys. the problem is that i cannot upload the file due patent issues. the second problem then is that this work has been done already by a competitor, so he want us able to do it too. i was surfing the net and i found some plug ins that allows to convert mesh (20000 faces in my case) to a SIngle surface: could be this an option to do boolerian difference between the solid and the single nurbs surface?
thanks
for the file you can image a mesh half sfere inside a cube, and u have to wipe out the sfere volume inside the cube…


(Pascal Golay) #5

Depending on the shape of the mesh, if it is simple and does not close in on itself too much,you might get something use-able if you run Patch on it.

-Pascal


#6

Hi, if you expect others to spend their time for free to help you not loose your job then the least you can do is to spend some time to make a similar setup to the one you work on.
Trying to explain 3D in plain text is a waste of time.


#7

Tnks for your time guys. Ive done te job using booleanmesh, convertimg all the objects to mesh.
I really appreciate your help!