How to get an value from 2 frames before the current frame using API! 2003-12-16 - By Erick Miller
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Use the MDGContext class with MPlug. Here is an example of using it with
MPlug::getValue() to get the value of an internal attribute on a node
back into an MObject (the attribute is in an MObject called
inputMeshAttribute) , this example would work for an attribute of
MFnData::kMesh (polygon mesh) which is a more complex example, but would
work just the same for simple numeric attributes and multis or compounds
just as well, using all the similar MPlug member functions :
double frameLagDbl = 2.0;
MTime timer = MAnimControl::currentTime();
double nowTime = timer.value();
double lagTime = nowTime - frameLagDbl;
timer.setValue( lagTime );
MDGContext timeContext( timer );
MObject thisNode = thisMObject();
MPlug inputGeometryPlug( thisNode, inputMeshAttribute );
MObject laggedInputGeomObj;
inputGeometryPlug.getValue( laggedInputGeomObj, timeContext );
Cheers,
Erick
hradec.com wrote:
>I need to get an attribute value using MDataBlock.inputValue() from
>inside my compute function, but I need to get that value from 2 frames
>before the current frame. Just like getAttr -t option, but for
>MDataBlock.inputValue()!
>How can I do that? Can I use MGlobal::viewFrame()? Or theres another way
>to do that?
>[]'s Hradec
>hradec@(protected)
>www.hradec.com/hradec
>
--
Erick Miller Technical Director emiller@(protected)
Digital Domain, 300 Rose Ave, Venice, CA 90291 (310)314-2800 ext.3504
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