FastMesh for Grasshopper: A cluster to make fast, light meshes from curves

Creating a mesh from a curve can be challenging in Grasshopper. Most ways of doing it involve creating a surface and then meshing that surface. And once the mesh is made, it often has inconsistent face densities, with unusual points of high point density.

bad_mesh

The mathematics behind these methds are fine for the general case (any closed curve in any alignment), but in cases where we have a planar polyline (i.e. no curved segments, such as a room or building outline) and where this curve lies in the XY plane, we can use a highly optimised algorithm.

FastMesh is my attempt. Simply connect a polyline (or list of polylines) and it will mesh those curves – without the heavy operation of creating intermediary surfaces. I have attempted to ensure that points are distributed evenly in a grid-like pattern (so it is suitable for creating analysis meshes for tools like Honeybee), and you can optionally control the distance between points by inputting a distance into ‘s’. If you leave ‘s’ blank (or set it to 0) it will create a mesh with a minimum number of faces, creating extremely light meshes, for example in creating buildings with Elk.

good_mesh

The principle of my method is that it generates a collection of mesh points, and removes any mesh points that don’t lie inside the curve. It then performs a Delaunay Triangulation on remaining points. For concave shapes, triangles will be formed that fall outside the curve, which are removed.

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