Class

• <DRM World 3x3>

Superclass

• <DRM SEDRIS Abstract Base>

Subclass

• None.

Definition

An instance of this DRM class specifies a nine element matrix containing scaling and rotation data as part of a <DRM World Transformation>. The direction of rotation is determined by the right-hand rule.

Translation data is not provided by a <DRM World 3x3>, because a <DRM World 3x3> instance only exists as part of a <DRM World Transformation>. The translation, or offset, component of a <DRM World Transformation> is provided by the mandatory <DRM Location> component of the <DRM World Transformation>. In essence, a <DRM World 3x3> matrix can be considered to be a full transformation matrix in which the rightmost column and bottom row have been omitted, because each is implicitly (0, 0, 0, 1).

<DRM World Transformation> instances usually exist in the scope of an <DRM Environment Root> defining a non-LSR spatial reference frame. Consequently, <DRM World 3x3> instances usually exist within a 'world' spatial reference frame, hence the name.

The matrix multiplication order is defined by w = M * v, where M is the <DRM World 3x3> matrix, v is the original location vector, and w is the resulting location vector.

Class diagram

Figure 6.359 — DRM_World_3x3

Constraints

• Publishable Object

Example(s)

• Scale and rotation applied to a <DRM Model> when placing an instance.

• ,P> The house near Dixie Road is facing east. The large house across the street is facing west.

• See <DRM Local 4x4> for more examples and explanations of matrix structure.