3d scan to mesh to Brep to waffle to cnc help

Hi,

I have been given a mesh from a scan in rhino of a physical model which was built at 1:17 scale.

The model was given to me in half with lots of holes. I have spent quite a long time stitching the mesh together and filling holes manually as the automatic meshrepair command didn't want to work for me.

The goal is to make the model into a Brep so I can cut waffle slices using this definition
http://www.grasshopper3d.com/forum/topics/a-solid-waffle-for-laser?...

My problem is I have never done this before converting to surface from a mesh is proving to be quite difficult with such a detailed mesh (I have even reduced the mesh from the original) Is anyone able to give me some guidance to where to start. I have been searching for a solution for almost a week now. With a lot of trial and error I still have got nowhere. Most commands chew up too much memory or hang till I force kill the task.

I have tried some Tsplines and Rhinosurf workflows with no luck, the online documentation that I have come across for these methods dont seem to go into enough detail for what I am looking for.

The link to my model is here if someone could please have a quick look and give me some pointers.

https://drive.google.com/a/monkers.com.au/file/d/0BzZQQ1vMJcL1R0Ntd...

Thanks for your time.
cheers.

Replies to This Discussion

Permalink Reply by Damon on July 21, 2014 at 10:06am

I don't think you'll have much luck converting this to surface geometry. I would recommend sticking with the mesh(es) to create the waffle slices? There are enough mesh commands (and plugins) that I imagine this would be easier than creating a surface.

Permalink Reply by Damon on July 21, 2014 at 10:16am

Here's a super-simple example that gets you intersection curves in one direction.

Attachments:

MeshMeshIntersect.gh, 7 KB

Permalink Reply by peter monkers on July 22, 2014 at 1:07am

Thanks for having a look Damon.

Thats basically just the _contour command.

I like the idea of getting all the slices laid out and numbered automatically as theres going to be heaps to cut.

I managed to get the mesh transformed into a very heavy surface but could never get it to turn into a solid even when I manually capped the boundaries. I had high hopes for rhinoresurf..

If i could get into a solid I would break it up into smaller parts to run the grasshopper definition on.

Thanks.

Permalink Reply by Damon on July 23, 2014 at 9:10am

Peter, thanks for sharing the Rhino model. I developed my definition a little farther to create slices. It's not elegant, but it gets the job done.

Permalink Reply by Damon on July 23, 2014 at 9:11am

Sorry, the file was too big with the mesh internalized. Here it is, you just have to set the mesh in the "Original Mesh" component. You'll have to move it closer to the origin, too.

Attachments: