3D Graphics Programming with QuickDraw 3D 1.5.4

Surface Tangents

Labels

ASCII: SurfaceTangent
Binary: srtn ( = 0x7372746E )

Data Format



 
Vector3D            paramU

Vector3D            paramV

paramU: The tangent in the u parametric direction.
paramV: The tangent in the v parametric direction.

Data Size

Description

A surface tangent object is used to specify three-dimensional tangents to the surface of a geometric object. These tangents serve to indicate the direction of increasing u and v in the surface parameterization of that object.

Parent Hierarchy

Element, attribute.

Parent Objects

Attribute set. A surface tangent always has a parent object.

Child Objects

None.

Example



 
Container (

    AttributeSet ( )

    SurfaceUV ( 0 0 )

    SurfaceTangent ( 

        1 0 0

        0 1 0

    )

)