anchor: Mesh:getVertexAttribute
  Gets the properties of a specific attribute within a vertex in the Mesh.
  
  Meshes without a custom vertex format specified in love.graphics.newMesh have position as their first attribute, texture coordinates as their second attribute, and color as their third attribute.
  value1, value2, ... = Mesh:getVertexAttribute( vertexindex, attributeindex )
  vertexindex number The index of the the vertex you want to retrieve the attribute for (one-based).
  attributeindex number The index of the attribute within the vertex to be retrieved (one-based).
  value1 number The value of the first component of the attribute.
  value2 number The value of the second component of the attribute.
  ... number Any additional vertex attribute components.