core.normals.face (procNode)

Give every primitive its normal: the direction its vertices wind around, written as N on the primitive class. scaled is the same direction scaled by twice the primitive's area.

Built from core.corners, attribute.promote (point to vertex), gather of the next corner, math.cross and a segmented reduce over each primitive's run (segments = primitive.count).

Inputs

• geometry (Geometry). The geometry whose primitives get normals.
• name (String). Default "N". The attribute the normals are written under on the primitive class.

Outputs

• geometry: the geometry with a normal on every primitive.
• scaled: the same direction scaled by twice the primitive's area, a Vec3 column per primitive.

Example

local grid = g.mesh.grid({ size = { x = 2, z = 2 }, cells = { x = 2, z = 2 } })
local faces = g.core.normals.face({ geometry = grid })

faces.geometry carries N on every primitive and faces.scaled the same direction scaled by twice each primitive's area.