Mesh:getVertex
Gets the properties of a vertex in the Mesh.

In versions prior to 11.0, color and byte component values were within the range of 0 to 255 instead of 0 to 1.
attributecomponent, ... = Mesh:getVertex( index )
index number The one-based index of the vertex you want to retrieve the information for.
attributecomponent number The first component of the first vertex attribute in the specified vertex.
... number Additional components of all vertex attributes in the specified vertex.
x, y, u, v, r, g, b, a = Mesh:getVertex( index )
index number The index of the vertex you want to retrieve the information for.
x number The position of the vertex on the x-axis.
y number The position of the vertex on the y-axis.
u number The horizontal component of the texture coordinate.
v number The vertical component of the texture coordinate.
r number The red component of the vertex's color.
g number The green component of the vertex's color.
b number The blue component of the vertex's color.
a number The alpha component of the vertex's color.