upcoming meshedit update

Replies to This Discussion

Permalink Reply by Mateusz Zwierzycki on January 15, 2014 at 10:22am

3d delaunay... will you release also a library to script with it ?

What's your 3d delaunay approach ?

Permalink Reply by to] on January 15, 2014 at 10:39am

It is solved over the 3DConvexHull. The componet will expose currently the DelaunayCell, the Topological Connectivity Diagram and the Indices of the delaunay cells.

What exactly do you want to access

Permalink Reply by Mateusz Zwierzycki on January 15, 2014 at 11:26am

it would be nice to have 3d delaunay as function, it can solve many problems.

Permalink Reply by to] on January 15, 2014 at 11:43am

Hi Mateusz,

i will note this for the next release. For this one i do not think it will be exposed as lib for refernecing to other components.

Btw. really great work you are doing, hope we meet up sometime in the future.

Permalink Reply by Mateusz Zwierzycki on January 15, 2014 at 12:00pm

Cool, this will help us all here... there were so many discussions ending with "...it would be possible with 3d delaunay"

Thanks, hope to meet you too ... any conference in plans ?

Permalink Reply by Matt Gaydon on January 15, 2014 at 11:02am

Collapse Mesh Edge would be a great help for optimization.

Permalink Reply by to] on January 15, 2014 at 11:17am

Hi Matt,

you referencing the rhino command?

what would be your criteria and should it collapse to the nearest neighbor?

Permalink Reply by Matt Gaydon on January 15, 2014 at 12:27pm

Yeah the rhino command, I was going some local optimization.

I wanted to collapse the edge between each of the red points and the centre green dot by collapse the mesh edge inbetween the green and the red dots so i can weld together the large and smaller meshes using only quads and triangle meshes.

I had a little look at plankton but it seem to be rather more complex than i was expecting to get the simple outcome i needed at the time.

 

Would it need a criteria as should it not automatically weld to the end point of the line/edge that been removed?

Permalink Reply by to] on January 15, 2014 at 12:51pm

in rhino it always welds to the startpoint of the line which is collapsed.

so it needs a criteria.

Also what should be the input?

Permalink Reply by Matt Gaydon on January 16, 2014 at 3:06am

Depending on how easy it is to find them i would say the Mesh Edge/s using that component as the input.

Though it maybe easier for the user to find and select the 2 vertices and either end of the edge/s they want to collapse and use these as inputs.

Having the option to select if it welds to the start or end point of the line with a Boolean toggle mabye good or it may just make this more confusing. 

Permalink Reply by David Stasiuk on January 16, 2014 at 3:20am

Plankton is actually useful for a number of reasons in this case. First of all, half-edge mesh data structures allow for more efficiently managed local topological changes through splits and collapses. Second of all, your starting condition is already an n-gon mesh (where you want to eliminate all of your 5-edged faces) and you're not going to be able to use the standard Rhino mesh class to execute your splits and collapses.

If you post the geometry, I'd be happy to help you get started.

Permalink Reply by Matt Gaydon on January 16, 2014 at 5:27am

Hi david,

The mesh in the image is a quick hack back from the final mesh that the did all the mesh edge collapse in rhino then welded together the parts of the different density meshes.I just replaces a few unweld mesh faces in the picture to explain what i wanted to do, they are not ngons.

The  workflow was done in such a way i had 2 version off the mesh at different levels of sub divison with the overlapping areas removed, then i went round the edge of the denser mesh and collapse selected edges before welding it to the simper mesh. So had no Ngons at any point and could just use rhino/GH commands.

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