Table 6.166—DRM_Local_4x4
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Property |
Description |
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Superclass |
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Class |
· <DRM Local 4x4> |
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Subclass |
· none |
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Definition |
An object of this DRM class specifies a sixteen element matrix used to scale, orient, and position objects in the scope of its parent <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 occurs as part of an <DRM LSR Transformation>, and an <DRM LSR Transformation> only occurs 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 define <DRM Model>s but not <DRM Environment Root>s, <DRM Local 4X4> is usually considered to be 'local'. However, a <DRM Environment Root> may be defined in an LSR spatial reference frame, in which case <DRM LSR Transformation> 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. |
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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. |
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Inherited field elements |
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Field elements |
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Associated to (one-way) (inherited) |
· none |
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Associated to (one-way) |
· none |
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Associated by (one-way) (inherited) |
· none |
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Associated by (one-way) |
· none |
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Associated with (two-way) (inherited) |
· none |
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Associated with (two-way) |
· none |
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Composed of (two-way) (inherited) |
· none |
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Composed of (two-way) |
· none |
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Composed of (two-way metadata) (inherited) |
· none |
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Composed of (two-way metadata) |
· none |
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Component of (two-way) (inherited) |
· none |
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Component of (two-way) |
· one <DRM LSR Transformation> |
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Constraints |
· none |
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Notes |
1 A standard 4x4 transformation matrix. |
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Class diagram |