SelectPoints

The node lets you select named points on a model, remove and rename them. It also allows loading and saving points to a file.

You can merge two sets of named points using a MergePoints node.

Two sets of named points can be combined into PointCorrespondences using a PointsToPointPairs node.

Editor

SelectPoints node has a visual editor that allows adding, removing, editing, and renaming points.

LMB	to add a new point
CTRL + LMB	to remove a point
click and drag a point	to move it

Point position is stored relative to a mesh triangle in which the point is located so the same point selection is suitable for different models with the same topology.

Inputs

geometry: Geometry An input geometry

Output

NamedPointsOnTriangle Named Points On Triangle

Parameters

Show Point Labels:

if set, point names are displayed in the visual editor

Show Invisible Points:

if not set, unselected points invisible from current point of view will not be displayed

Base Name:

a base name for a newly created point

Padding:

defines a minimal number of digits that will be used in the name of a newly created point

Symmetry:

No Symmetry: don’t use symmetry
Topological: use topological symmetry
X: use symmetry in X-axis
Y: use symmetry in Y-axis
Z: use symmetry in Z-axis

Rename All Points:

renames all the points according to specified base name and padding.

Rename:

renames a selected point

Delete:

deletes a selected point

Import:

loads named points from a file

Export:

saves the points into a file

File Formats

Named points can be exported in the following JSON formats:

Point On Triangle

The points are represented in the following JSON format:

[ [0, 0.3, 0.5], [1, 0.0, 1.0] ]

This line stores two points. Each point is represented with 3 numbers:

index of the triangle containing the point
the first barycentric coordinate of the point inside the triangle
the second barycentric coordinate of the point inside the triangle

Tip

If a model contains polygons with more than 3 vertices Wrap implicitly stores a triangulated version of the model. Wrap uses naive fan triangulation with the fan origin at the first vertex of the polygon.

Tip

Barycentric coordinates is a way to encode point position inside a triangle with two numbers U and V. If a triangle has 3 vertices with 3D coordinates A, B and C, barycentric coordinates U and V defines a point in 3D which position is calculated like:

P = A * U + B * V + C * (1 - U - V)

Named Point On Triangle

The points are represented in the following JSON format:

{ "Point01" : [0, 0.3, 0.5], "Point02" : [1, 0.0, 1.0] }

3D-Point

This JSON format stores point coordinates in 3D space.

[ [ 0.1, 0.5, 1.2 ], [ 0.0, 1.7, 0.9 ] ]

This line stores two points. Each point is represented with 3 numbers:

X coordinate of the point
Y coordinate of the point
Z coordinate of the point