Plugin channels/WorldEditCUI
WorldEdit uses plugin channels to communicate with the clientside WorldEditCUI mod to display selections. Client-side source code: https://github.com/Mumfrey/WorldEditCUI/
This is a (very) rough documentation of those channels that I'll improve.
Contents
Selection types
There are several types of selections. Each type has a format used with current versions of WorldEditCUI and a second format used in older versions (usually a cube with similar edges).
Cuboid
A basic rectangular selection, with minimum and maximum points.
Minimum protocol version: 0
- Current version and legacy versions
Shape ID is cuboid.
If the selection has a position one (left click), it is sent with as a Point with an id of 0. If the selection has a position two (right click), it is sent with as a Point with an id of 1.
Ellipsoid
Ellipsoid selections form 3-dimensional ellipses and spheres. They have a center, and then x, y, and z radii (measured from the center).
Minimum protocol version: 1
- Current version
Shape ID is ellipsoid.
An ellipsoid point with id 0 is sent for the center, and an ellipsoid point with id 1 is sent to set the radii (these are distances, not coordinates).
- Legacy versions
Ellipsoid regions are sent as cuboids with their minimum and maximum positions in legacy versions.
Cylinder
A vertical cylinder selection.
Minimum protocol version: 1
- Current version
Shape ID is cylinder.
A cylinder packet is sent with the center and radius, and then a min/max packet is sent to set the bottom and top of the selection.
- Legacy versions
Sent as a cuboid with the minumum and maximum positions.
2D Polygon
A 2-dimensional, flat polygon.
Minimum protocol version: 0
- Current and legacy versions
Shape ID: polygon2d
For all of the points in the selection, a Point 2D packet is sent with the point's x and z coordinates. Then, a min/max packet is sent to set the bottom and top of the selection.
3D Polyhedron
A 3-dimensional polygonal selection.
Minimum protocol version: 3
- Current version
Shape ID is polyhedron.
For each point in the polyhedrion, a Point packet is sent with the x, y, and z coordinates. Then, for each triangle in the selection, a Polygon packet is sent with vertecies set to the index of each point that makes up the triangle.
- Legacy versions
Sent as a cuboid with the minumum and maximum positions.
Structure
All communication is performed over the WECUI plugin channel, and is made up of a single UTF8 string with each value separated by |. The client, aside from REGISTERing the channel, must also send an initialization packet. All other data is sent from the server (on the same channel).
Version
The v packet is sent from the client to the server to tell it that WorldEditCUI is installed. It has one parameter, the version of WorldEditCUI's protocol (an integer). This value is used to decide which types of selections can be sent - if a type of selection is not supported it will be sent as a different structure that is known to be supported.
v|(version)
Shape
The s packet does something with shapes. It has one field, the shape of the selection (?).
s|(shape)
Point
The p packet sets the location of one of the points in the current selection. It has 5 fields: the id, the block x, y, and z, and the total area.
p|(id)|(x)|(y)|(z)|(area)
Point 2D
The p2 packet sets the location of one of the points in the current selection, two-dimensionally. It has 4 fields: the id, the block x and z, and the total area.
p2|(id)|(x)|(z)|(area)
Cylinder
The cyl packet sets info about a cylindrical selection (?). It has 5 fields: the x, y, and z of the center and then the radius x and z.
cyl|(x)|(y)|(z)|(radX)|(radZ)
Ellipsoid Point
The e packet does... I don't know. It has 4 fields: the id, and x, y, and z coordinates.
e|(id)|(x)|(y)|(z)
Min/Max
The mm packet does something else. It has two fields, the minimum and the maximum. What these are the minimum and maximum of, I know not.
mm|(min)|(max)
Polygon
The poly packet sets verticies of a polygonal selection. It has an array of 3 (although it may be possible to add more) values, which seem to be indexes in the points list?
poly|(vertex1)|(vertex2)|(vertex3)
