Indicates if this object is still valid, i.e. hasn't been deleted or some other action done to invalidate the reference.
"lineParallelToPlanarSurfaceConstraint_var" is a variable referencing a LineParallelToPlanarSurfaceConstraint object.
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"lineParallelToPlanarSurfaceConstraint_var" is a variable referencing a LineParallelToPlanarSurfaceConstraint object.
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