Face4 - Quad face
------------------------

.. rubric:: Constructor

.. class:: Face4( a, b, c, d, normal, color, materialIndex )

    Quad face

    (indices start from zero)

    :param integer a: vertex index
    :param integer b: vertex index
    :param integer c: vertex index
    :param integer d: vertex index
    :param varying normal: face normal or array of vertex normals
    :param varying color: face color or array of vertex colors
    :param integer materialIndex: material index


.. rubric:: Attributes

.. attribute:: Face4.a

    Vertex A index

.. attribute:: Face4.b

    Vertex B index

.. attribute:: Face4.c

    Vertex C index

.. attribute:: Face4.d

    Vertex D index

.. attribute:: Face4.normal

    Face normal

    ``default (0,0,0)``

.. attribute:: Face4.color

    Face color

    ``default white``

.. attribute:: Face4.centroid

    Face centroid

.. attribute:: Face4.vertexNormals

    Array of vertex normals

.. attribute:: Face4.vertexColors

    Array of vertex colors

.. attribute:: Face4.vertexTangents

    Array of vertex tangents

.. attribute:: Face4.materialIndex

    Material index (points to ``geometry.materials`` array)


.. rubric:: Example

::

    var face = new THREE.Face4( 0, 1, 2, 3, new THREE.Vector3( 0, 1, 0 ), new THREE.Color( 0xffaa00 ), 0 );