topology.participation (procNode)

The faces a group selects, as a 0/1 column over the primitives: all of them when no group is named. A group on another class selects the faces every one of whose elements is in it (promote = "all") or at least one is ("any"). The selection every topology node restricts its answer by.

Inputs

• geometry (Geometry): the geometry carrying the group.
• group (String, default ""): names a 0/1 attribute on class restricting which faces take part; empty, the whole mesh takes part. A name the class does not carry is refused.
• class (String, default "primitive"): the class group lives on: "edge", "point", "primitive" or "vertex".
• promote (String, default "all"): how a group on a class other than "primitive" becomes a face set: "all" takes the faces every one of whose elements of that class is in the group, "any" the faces at least one is.

An element is in the group when its value is above 0.5.

Outputs

• mask (Field<Float>): 1 for each face that takes part, 0 for the rest, one value per primitive.

Example

local box = g.mesh.box({})
box.point.up = g.compare(box.point.N.y, "gt", 0.5)
local taking = g.topology.participation({ geometry = box, group = "up", class = "point" })