Class

• <DRM Local 4x4>

Superclass

• <DRM SEDRIS Abstract Base>

Subclass

• None.

Definition

An instance of this DRM class specifies a sixteen element matrix that is used to scale, orient, and position objects in the scope of its aggregate <DRM LSR Transformation>. The direction of rotation is determined by the right-hand rule. The translation parameters are always in the rightmost column of the matrix.

Since a <DRM Local 4x4> only appears as part of an <DRM LSR Transformation>, and an <DRM LSR Transformation> only appears in the scope of an LSR spatial reference frame, the objects to which a <DRM Local 4x4> is applied are always defined in an LSR spatial reference frame. (Since LSR spatial reference frames are usually used to specify <DRM Model> rather than <DRM Environment Root> instances, <DRM Local 4x4> is usually considered to be 'local'. However, an <DRM Environment Root> may be specified in an LSR spatial reference frame, in which case <DRM LSR Transformation> instances would be legal within its scope.)

The matrix multiplication order is defined by w = M * v, where M is the <DRM Local 4x4> matrix, v is the original location vector, and w is the resulting location vector.

Class diagram

Figure 6.164 — DRM_Local_4x4

Constraints

• Publishable Object

Example(s)

• The position and orientation of the control tower in a <DRM Model> of an airport is specified by the <DRM Local 4x4>. See <DRM Transformation> for more examples.