field.attribute

A named attribute of a domain as a field. Wired, read off geometry; unwired, read off the domain the field is evaluated over. class picks the domain's point, vertex, primitive, edge or detail columns. A detail value stands for every element. The type and width come from the column, or from width for an unwired read of a name other than P, N and v.

Inputs

• geometry (Geometry, optional). The geometry the attribute is read off. Left unwired, the attribute is read off the domain the field is evaluated over: a solver's particles, or the geometry an attribute write targets.
• name (String). Default "P". Which attribute to read, P (the position) when left alone. It has to be one the domain carries; a name it does not carry is an error.
• class (one of detail, edge, point, primitive, vertex). Default "point". Which domain's column is read. A detail value, one for the whole domain, is read as the same value at every element.
• width (Float). Default 0. How many components the attribute holds when geometry is unwired and it is not a position, normal or velocity (3 each). 0 reads one.

Outputs

• field: the attribute as a field (unwired) or as the column itself (wired).

Example

local points = g.points.grid({ countX = 4, countZ = 1, spacing = 1 })
local out = g.attribute.set({ geometry = points, name = "v", value = g.field.attribute({ name = "P" }).x * 10 })

Each point's v is ten times its own x: -15, -5, 5, 15.