3D Graphics Programming with QuickDraw 3D 1.5.4

Back-facing Styles

Labels

ASCII: BackfacingStyle
Binary: bckf ( = 0x62636B66 )

Back-facing styles



 
Both                0x00000000

Culled              0x00000001

Flipped             0x00000002

Constant descriptions

Both: A renderer should draw shapes that face toward and away from the camera. If a shape has only front-facing attributes, those attributes are used for both sides of the shape.
Culled: A renderer should not draw shapes that face away from the camera (this is not the same as hidden surface removal).
Flipped: A renderer should draw shapes that face toward and away from the camera. If a shape has only front-facing attributes, those attributes are used for both sides of the shape, but the normals of back-facing shapes are inverted, so that they face toward the camera.

Data Format



 
BackfacingEnum                  backfacing

backfacing: The value in this field must be one of the three constants defined above.

Description

A scene's back-facing style determines whether or not a renderer draws shapes that face away from a scene's camera. This style object defines some of the characteristics of a renderer and generally applies to all of the objects in a model.

Parent Hierarchy

Shared, shape, style.

Parent Objects

None.

Child Objects

None.

Example



 
BeginGroup ( OrderedDisplayGroup ( ) )

    Matrix ( ... )

    BackfacingStyle ( Both )

    Mesh ( ... )

    Mesh ( ... )

EndGroup ( )