Get rid of triangles in delaunay mesh?

Here is a quick test-case, for the project I am working on, I have 800k vertices from Lidar data on a terrain that I need to convert to a mesh. I want to visualise it in Blender and would like to smooth it at render time, for which the triangles pose a problem as they take a big performance hit.

Is it possible to get rid of the triangulation that is caused by the Delaunay Mesh component?
I am assuming that the quad remesh component is the best solution for this as it will also get rid of non-flat quads? Or is there an alternative solution to convert a point file (CSV) into a quad mesh?

Test case: (10.2 KB)

You won’t want quads that fold in their center (which will happen unless you want to lose the shape of that). The display and shading will look pretty bad.

You could remesh the triangulated mesh with the QuadRemesher, either in Grasshopper or Rhino (or even Blender).

Instead of creating a Delaunay mesh and trying to get rid of triangles you can create a quad mesh from sorted points, using a mesh plane on the XY plane. (19.3 KB)

Yes indeed, which is why I am asking :wink:
Then again, I don’t want there to be too much of a deviation, which is why I think Quad Remesh may not be the best approach.

At least creating a point grid is more accurate than the Heightfield command…

I’ll give that a try, thanks. Will have to check whether the quads remain flat (not folded).

In general, does remeshing create flat quads in Rhino/ GH?

If by flat you mean planar than no. Only triangular faces are planar by nature.

1 Like

If you don’t want too much deviation then I am afraid to tell you, there is a reason that geometry you made (and seem to like) is made of triangles. :smirk:

Yes of course, I understand that much :smirk:
I was looking for a way to minimise deviation while getting a quad mesh. Anyways, the remesher works well, but is prone to causing five sided poles in the mesh. Is the algorithm based on instant meshes?

In the end, the drape command surface modelling ended up working better with GH, there’s no mesh project. Urbano has a project to terrain, but that’s pretty slow compared to surface project, so…

You could try the Softwrap retolopology add-on for Blender. It looks promising.

There’s also Jremesh:

The author was supposedly working on integrating Quadwild, an open-source remesher. This addon already supports Instant Meshes and Blender’s Quadriflow.

Other than that, there’s Quadremesh, which is by the same person who developed Zremesher in Zbrush (Quad Remesher auto-retopologizer - Released Scripts and Themes - Blender Artists Community). Apparently it’s the best one for Blender at the moment.