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.