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22 Jan 2010

The graphics library has a new class, TransformController, that derives from
Controller.  It manages the local transformation for a Spatial object.

The KeyframeController class used to be derived from Controller, but is now
derived from TransformationController.  The reason is that the key frames of
a KeyframeController may affect only *some* of the transformation channels.
For example, if a KeyframeController has only translation key frames, then the
3x3 matrix of the transformation is never modified.  Effectively, the system
relied (implicitly) on the application setting the local transformation for
mObject, which fills in those transformation channels not affected by the
key frames.  By living on top of TransformController, KeyframeController now
fills in *all* of the transformation channels.

The streaming system is affected by this change.  The streaming version of
Wild Magic 5.0 is WM_VERSION_5_0 (see LibCore/ObjectSystems, files
Wm5InStream.h and Wm5OutStream.h).  The version number is changed to
WM_VERSION_5_1.  A streamed KeyframeController object in WM_VERSION_5_1 has
a Transform object occurring *before* the mNumCommonTimes member.
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