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The SEDRIS Data Representation Model
APPENDIX A - Classes LSR Transformation |
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An instance of this DRM class is a <Transformation> instance, specified by a 4 × 4 matrix, used to transform a DRM object defined in one LSR SRF into another LSR SRF when the original SRF does not have <LSR 2D Location> instances that are maintained as conforming points. (If the original SRF does have conforming points that are maintained, a <World Transformation> instance shall be used instead.)
NOTE The 4 × 4 matrix may be explicitly specified as a <Local 4x4> component and/or implicitly by a series of <LSR Transformation Step> components, as long as <<LSR Transformation Components>> is obeyed.
Let V be a <Model> instance classified as ECC_GROUND_VEHICLE, such that V represents a ground vehicle with four wheels. Let W be another <Model> instance, where W represents one such wheel, and V and W are specified in identical 3D LSR SRFs.
Rather than V specifying the geometry of a wheel four times, once for each instance of such a wheel, V contains <Geometry Model Instance> instances that reference W, once for each wheel, where a given <Geometry Model Instance> instance has an <LSR Transformation> component specifying how to transform that instance of the wheel model to position and orient it on the appropriate axle of V.
The <Translation> instances, <Rotation> instances, and <Scale> instances applied to a gun barrel when modelled into a tank turret.
Let S be a <Model> instance representing a sidewinder missile, where S is specified in an LSR 3D SRF and S is represented within that SRF standing vertically on its fins.
Suppose that S is a component of a <Model Library> instance within which the data provider specifies that all geometric representations of <Model> instances are being given a horizontal rather than a vertical orientation. To make S consistent with the <Model Library> instance, the <Geometry Model> instance of S contains an <LSR Transformation> component that specifies an appropriate <Rotation> instance that, if applied, results in the desired orientation.
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