cameraSetSubclass/exCameraSet.h

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#include <maya/MObject.h>
#include <maya/MPxCameraSet.h>
#include <maya/MTypeId.h> 

class MPlug;

class exCameraSet : public MPxCameraSet
{
public:
                        exCameraSet();
    virtual             ~exCameraSet(); 

    MStatus             setLayerType(unsigned int index, int layerType);
    MStatus             getLayerType(unsigned int index, int & layerType) const;

    static  void*       creator();
    static  MStatus     initialize();

public:
    static  MObject     layerTypeAttr;  // The layerType attribute.
    static  MTypeId     id;             // The IFF type id

private:
    MStatus             getLayerTypePlug(unsigned int index, MPlug &layerTypePlug) const;
};