add_field method

add_field(self, data_type, semantic, index, alias)

Add a new vertex field


def add_field(self, data_type, semantic, index, alias):
    ...

Parameter	Type	Description
data_type	`VertexFieldDataType`	The data type of the vertex field
semantic	`VertexFieldSemantic`	How will this field used for
index	int	The index for same field semantic, -1 for auto-generation
alias	str	The alias name of the field