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Convex Hull 2D

Outputs a 2D convex hull.

The Convex Hull 2D outputs the edges/graph of a 2D convex hull. Prune points to exclude non-hull vertices. Specify attributes and projection settings for customization.

In
Points clouds that will be triangulated
Vtx
Endpoints of the output Edges
Edges
Edges associated with the output Vtxs
Paths
Hull points ordered as a path

Table of content

The 2D Convex Hull node capture the convex bounding shape of a set of point in two dimensions.
Under-the-hood the points are first projected on a plane, and the hull is deducted from that projection.

The node outputs a single cluster that contains the unordered hull & its edges, as well as an actual “canon” path, whose points are ordered in clockwise order.

details/hulls/hull-convex-hull-2d-lead.png

Properties


Projection Settings


The projection settings control how the point position is translated to a 2D space before the graph is computed; and how this projection will translate back to the original space, if relevant.

Property Description
Projection Normal Normal vector of the plane used for projection.
By default, the projection plan normal is Up; so the graph is computed over the X Y plane.
Local Projection Normal If enabled, uses a per-point projection vector.
Local Normal Attribute ti read normal from,

Local projection normal is very powerful but can also be very clunky to use – it’s very easy to end up with singularities that will prevent the graph from being properly computed.

Cluster Output Settings

See Working with Clusters - Cluster Output Settings.