semantic
The semantic of the vertex attribute, which describes how you want RealityKit to interpret the attribute.
Declaration
var semantic: LowLevelMesh.VertexSemanticDiscussion
RealityKit consults the vertex semantic when interpreting the data in your LowLevelMesh. For example, an attribute with the semantic value of LowLevelMesh.VertexSemantic.position uses to determine the position of a vertex.