MDataBlock Class Reference
[OpenMaya - API module for common classes]

#include <MDataBlock.h>

List of all members.

Detailed Description

Dependency node data block.

An MDataBlock provides storage for the data being received by or sent by the node. It is the data for the plugs and attributes of the node. The data block is only valid during the compute method of the depend node. Pointers to the data block should not be retained after the compute method.

Access to the data in an MDataBlock is done using an MDataHandle or an MArrayDataHandle.

Examples:

affectsNode.cpp, animCubeNode.cpp, anisotropicShader.cpp, apiMeshCreator.cpp, apiMeshCreator.h, apiMeshShape.cpp, apiMeshShape.h, arcLenNode.cpp, backfillShader.cpp, blindDataMesh.cpp, blindDataMesh.h, blindDataShader.cpp, blindDataShader.h, brickShader.cpp, buildRotationNode.cpp, cellShader.cpp, cgfxShaderNode.cpp, cgfxShaderNode.h, cgfxVector.cpp, cgfxVector.h, checkerShader.cpp, circleNode.cpp, clearcoat.cpp, closestPointOnCurveNode.cpp, closestPointOnCurveNode.h, compositingShader.cpp, contrastShader.cpp, curvedArrowsNode.cpp, cvColorNode.cpp, cvColorShader.cpp, depthShader.cpp, displacementShader.cpp, dynExprField.cpp, dynExprField.h, exampleMRampAttribute.cpp, flameShader.cpp, footPrintManip.cpp, footPrintNode.cpp, fullLoftNode.cpp, gammaShader.cpp, genericAttributeNode.cpp, geometrySurfaceConstraint.cpp, geometrySurfaceConstraint.h, geomShader.cpp, GLSLShaderNode.cpp, GLSLShaderNode.h, hwColorPerVertexShader.cpp, hwDecalBumpShader_NV20.cpp, hwDecalBumpShader_NV20.h, hwPhongShader.cpp, hwPhongShader.h, hwReflectBumpShader_NV20.cpp, hwReflectBumpShader_NV20.h, hwRefractReflectShader_NV20.cpp, hwRefractReflectShader_NV20.h, hwToonShader_NV20.cpp, hwToonShader_NV20.h, hwUnlitShader.cpp, hwUnlitShader.h, interpShader.cpp, jitterNode.cpp, lambertShader.cpp, latticeNoise.h, latticeNoiseNode.cpp, lavaShader.cpp, lightShader.cpp, meshOpNode.cpp, meshOpNode.h, mixtureShader.cpp, multiCurveNode.cpp, noiseShader.cpp, offsetNode.cpp, ownerEmitter.cpp, ownerEmitter.h, particleAttrNode.cpp, particleAttrNode.h, phongShader.cpp, pointOnMeshInfoNode.cpp, pointOnMeshInfoNode.h, pointOnSubdNode.cpp, pointOnSubdNode.h, polyTrgNode.cpp, quadricShape.cpp, renderAccessNode.cpp, rockingTransform.cpp, rockingTransformCheck.cpp, rockingTransformCheck.h, shadowMatteShader.cpp, shellNode.cpp, shiftNode.cpp, simpleEmitter.cpp, simpleEmitter.h, simpleFluidEmitter.cpp, simpleFluidEmitter.h, simpleLoftNode.cpp, simpleSpring.cpp, simpleSpring.h, sineNode.cpp, slopeShaderNode.cpp, slopeShaderNode.h, solidCheckerShader.cpp, splitUVNode.cpp, splitUVNode.h, stringFormatNode.cpp, sweptEmitter.cpp, sweptEmitter.h, swissArmyManip.cpp, testNobjectNode.cpp, testNobjectNode.h, testNucleusNode.cpp, testNucleusNode.h, torusField.cpp, torusField.h, transCircleNode.cpp, volumeShader.cpp, weightListNode.cpp, and yTwistNode.cpp.


Public Member Functions

virtual ~MDataBlock ()
MDataHandle inputValue (const MPlug &plug, MStatus *ReturnStatus=NULL)
MDataHandle inputValue (const MObject &attribute, MStatus *ReturnStatus=NULL)
MDataHandle outputValue (const MPlug &plug, MStatus *ReturnStatus=NULL)
MDataHandle outputValue (const MObject &attribute, MStatus *ReturnStatus=NULL)
MArrayDataHandle inputArrayValue (const MPlug &plug, MStatus *ReturnStatus=NULL)
MArrayDataHandle inputArrayValue (const MObject &attribute, MStatus *ReturnStatus=NULL)
MArrayDataHandle outputArrayValue (const MPlug &plug, MStatus *ReturnStatus=NULL)
MArrayDataHandle outputArrayValue (const MObject &attribute, MStatus *ReturnStatus=NULL)
MStatus setClean (const MPlug &plug)
MStatus setClean (const MObject &attribute)
bool isClean (const MPlug &plug)
bool isClean (const MObject &attribute, MStatus *ReturnStatus=NULL)
MDGContext context (MStatus *ReturnStatus=NULL)
MStatus setContext (const MDGContext &ctx)

Friends

class MArrayDataBuilder
class MPxNode
class MPlug

Constructor & Destructor Documentation

MDataBlock::~MDataBlock (  )  [virtual]

The class destructor.

Member Function Documentation

MDataHandle MDataBlock::inputValue ( const MPlug &  plug,
MStatus *  ReturnStatus = NULL 
)

Gets a handle to this data block for the given plug's data. The data represented by the handle is guaranteed to be valid for reading. If the data is from a dirty connection, then the connection will be evaluated. If no connection is present, then the value that the plug has been set to will be returned. If the plug has not been set to a particular value, then the default value will be returned.

Parameters:
[in] plug the plug whose data you wish to access
[out] ReturnStatus the return status
Returns:
Data handle for the given plug's data
Status Codes:
Examples:
affectsNode.cpp, animCubeNode.cpp, anisotropicShader.cpp, apiMeshCreator.cpp, apiMeshShape.cpp, arcLenNode.cpp, backfillShader.cpp, blindDataMesh.cpp, brickShader.cpp, buildRotationNode.cpp, cellShader.cpp, cgfxVector.cpp, checkerShader.cpp, circleNode.cpp, clearcoat.cpp, closestPointOnCurveNode.cpp, compositingShader.cpp, contrastShader.cpp, cvColorNode.cpp, cvColorShader.cpp, depthShader.cpp, displacementShader.cpp, dynExprField.cpp, flameShader.cpp, gammaShader.cpp, genericAttributeNode.cpp, geometrySurfaceConstraint.cpp, geomShader.cpp, hwColorPerVertexShader.cpp, hwPhongShader.cpp, hwToonShader_NV20.cpp, interpShader.cpp, jitterNode.cpp, lambertShader.cpp, latticeNoiseNode.cpp, lavaShader.cpp, lightShader.cpp, meshOpNode.cpp, mixtureShader.cpp, multiCurveNode.cpp, noiseShader.cpp, offsetNode.cpp, ownerEmitter.cpp, ownerEmitter.h, particleAttrNode.cpp, phongShader.cpp, pointOnMeshInfoNode.cpp, pointOnSubdNode.cpp, rockingTransformCheck.cpp, shadowMatteShader.cpp, shiftNode.cpp, simpleEmitter.cpp, simpleEmitter.h, simpleFluidEmitter.cpp, simpleLoftNode.cpp, simpleSpring.h, sineNode.cpp, slopeShaderNode.cpp, solidCheckerShader.cpp, splitUVNode.cpp, stringFormatNode.cpp, sweptEmitter.cpp, sweptEmitter.h, testNobjectNode.cpp, testNucleusNode.cpp, torusField.cpp, torusField.h, transCircleNode.cpp, volumeShader.cpp, and yTwistNode.cpp.

MDataHandle MDataBlock::inputValue ( const MObject &  attribute,
MStatus *  ReturnStatus = NULL 
)

Gets a handle to this data block for the given plug's data. The data represented by the handle is guaranteed to be valid for reading. If the data is from a dirty connection, then the connection will be evaluated. If no connection is present, then the value that the plug has been set to will be returned. If the plug has not been set to a particular value, then the default value will be returned.

Parameters:
[in] attribute the attribute of the node that you want to access
[out] ReturnStatus the return status
Returns:
Data handle for the given attributes's data
Status Codes:

MDataHandle MDataBlock::outputValue ( const MPlug &  plug,
MStatus *  ReturnStatus = NULL 
)

Gets a handle to this data block for the given attributes's data. The data is not guaranteed to be valid. No dependency graph evaluations will be done. Therefore, this handle should be used only for writing.

Parameters:
[in] plug the plug whose data you wish to access
[out] ReturnStatus the return status
Returns:
Data handle for the given plug's data
Status Codes:
Examples:
affectsNode.cpp, animCubeNode.cpp, anisotropicShader.cpp, apiMeshShape.cpp, arcLenNode.cpp, backfillShader.cpp, blindDataMesh.cpp, blindDataShader.cpp, brickShader.cpp, buildRotationNode.cpp, cellShader.cpp, cgfxShaderNode.cpp, cgfxVector.cpp, checkerShader.cpp, circleNode.cpp, clearcoat.cpp, closestPointOnCurveNode.cpp, compositingShader.cpp, contrastShader.cpp, cvColorNode.cpp, cvColorShader.cpp, depthShader.cpp, displacementShader.cpp, flameShader.cpp, fullLoftNode.cpp, gammaShader.cpp, genericAttributeNode.cpp, geometrySurfaceConstraint.cpp, geomShader.cpp, GLSLShaderNode.cpp, hwColorPerVertexShader.cpp, hwDecalBumpShader_NV20.cpp, hwPhongShader.cpp, hwReflectBumpShader_NV20.cpp, hwRefractReflectShader_NV20.cpp, hwToonShader_NV20.cpp, hwUnlitShader.cpp, interpShader.cpp, jitterNode.cpp, lambertShader.cpp, latticeNoiseNode.cpp, lavaShader.cpp, lightShader.cpp, meshOpNode.cpp, mixtureShader.cpp, noiseShader.cpp, particleAttrNode.cpp, phongShader.cpp, pointOnMeshInfoNode.cpp, pointOnSubdNode.cpp, renderAccessNode.cpp, rockingTransform.cpp, rockingTransformCheck.cpp, shadowMatteShader.cpp, shellNode.cpp, shiftNode.cpp, simpleLoftNode.cpp, sineNode.cpp, slopeShaderNode.cpp, solidCheckerShader.cpp, splitUVNode.cpp, stringFormatNode.cpp, testNobjectNode.cpp, transCircleNode.cpp, and volumeShader.cpp.

MDataHandle MDataBlock::outputValue ( const MObject &  attribute,
MStatus *  ReturnStatus = NULL 
)

Gets a handle to this data block for the given attributes's data. The data is not guaranteed to be valid. No dependency graph evaluations will be done. Therefore, this handle should be used only for writing.

Parameters:
[in] attribute the attribute of the node that you want to access
[out] ReturnStatus the return status
Returns:
Data handle for the given attribute's data
Status Codes:

MArrayDataHandle MDataBlock::inputArrayValue ( const MPlug &  plug,
MStatus *  ReturnStatus = NULL 
)

Gets an array handle to this data block for the given plug's data. This is only valid if the given plug has array data. The data represented by the handle will be valid. If the data is from a dirty connection, then the connection will be evaluated. If no connection is present, then the value that the plug has been set to will be returned. If the plug has not been set to a particular value, then the default value will be returned.

Parameters:
[in] plug the plug whose data you wish to access
[out] ReturnStatus the return status
Returns:
Array data handle for the given attributes's data
Status Codes:
Examples:
anisotropicShader.cpp, backfillShader.cpp, dynExprField.cpp, fullLoftNode.cpp, geometrySurfaceConstraint.cpp, lambertShader.cpp, ownerEmitter.h, phongShader.cpp, shadowMatteShader.cpp, simpleEmitter.h, sweptEmitter.h, testNucleusNode.cpp, and weightListNode.cpp.

MArrayDataHandle MDataBlock::inputArrayValue ( const MObject &  attribute,
MStatus *  ReturnStatus = NULL 
)

Gets an array handle to this data block for the given plug's data. This is only valid if the given plug has array data. The data represented by the handle will be valid. If the data is from a dirty connection, then the connection will be evaluated. If no connection is present, then the value that the plug has been set to will be returned. If the plug has not been set to a particular value, then the default value will be returned.

Parameters:
[in] attribute The attribute whose data you wish to access
[out] ReturnStatus The return status
Returns:
Array data handle for the given attributes's data
Status Codes:

MArrayDataHandle MDataBlock::outputArrayValue ( const MPlug &  plug,
MStatus *  ReturnStatus = NULL 
)

Gets a handle to this data block for the given plug. No dependency graph evaluations will be done, and therefore the data is not guaranteed to be valid (i.e. it may be dirty). Typically, this method is used to get the handle during compute in order to write output data to it.

Another usage of this method is to access an input array attribute without evaluating any of its array elements. One can then use MArrayDataHandle::jumpToElement to get to the particular element of interest, and evaluate its value using MArrayDataHandle::inputValue.

Parameters:
[in] plug the plug whose data you wish to access
[out] ReturnStatus the return status
Returns:
Array data handle for the given plug's data
Status Codes:
Examples:
apiMeshShape.cpp, dynExprField.cpp, multiCurveNode.cpp, ownerEmitter.cpp, simpleEmitter.cpp, stringFormatNode.cpp, sweptEmitter.cpp, and torusField.cpp.

MArrayDataHandle MDataBlock::outputArrayValue ( const MObject &  attribute,
MStatus *  ReturnStatus = NULL 
)

Gets a handle to this data block for the given attributes's data. The data is not guaranteed to be valid. No dependency graph evaluations will be done. Therefore, this handle should be used only for writing.

Parameters:
[in] attribute the attribute of the node that you want to access
[out] ReturnStatus the return status
Returns:
Array data handle for the given attribute's data
Status Codes:

MStatus MDataBlock::setClean ( const MPlug &  plug  ) 

Tells the dependency graph that the given plug has been updated and is now clean. This should be called after the data in the plug has been recalculated from the inputs of the node.

Parameters:
[in] plug the plug that is to be marked clean
Returns:
Result status code
Status Codes:
Examples:
affectsNode.cpp, animCubeNode.cpp, anisotropicShader.cpp, apiMeshCreator.cpp, arcLenNode.cpp, blindDataMesh.cpp, cgfxVector.cpp, circleNode.cpp, closestPointOnCurveNode.cpp, cvColorNode.cpp, dynExprField.cpp, fullLoftNode.cpp, genericAttributeNode.cpp, geometrySurfaceConstraint.cpp, hwColorPerVertexShader.cpp, jitterNode.cpp, latticeNoiseNode.cpp, ownerEmitter.cpp, pointOnMeshInfoNode.cpp, pointOnSubdNode.cpp, shellNode.cpp, simpleEmitter.cpp, simpleLoftNode.cpp, sineNode.cpp, sweptEmitter.cpp, testNobjectNode.cpp, testNucleusNode.cpp, torusField.cpp, and transCircleNode.cpp.

MStatus MDataBlock::setClean ( const MObject &  attribute  ) 

Tells the dependency graph that the given attribute has been updated and is now clean. This should be called after the data in the plug has been recalculated from the inputs of the node.

Parameters:
[in] attribute the attribute that we have updated the data for
Returns:
Result status code
Status Codes:

bool MDataBlock::isClean ( const MPlug &  plug  ) 

Queries the dependency graph to see whether the given plug is clean.

Parameters:
[in] plug the plug that is to be query
Returns:
Result boolean code, true if plug is clean, false otherwise.

bool MDataBlock::isClean ( const MObject &  attribute,
MStatus *  ReturnStatus = NULL 
)

Queries the dependency graph to see whether the given attribute is clean.

Parameters:
[in] attribute the attribute that is to be query
Returns:
Result boolean code, true if the attribute is clean, false otherwise.
Status Codes:

MDGContext MDataBlock::context ( MStatus *  ReturnStatus = NULL  ) 

Returns a copy of the dependecy graph context for which this data block was created. The context is used to specify how a dependency node is going to be evaluated.

Parameters:
[out] ReturnStatus Status code
Returns:
The dependency graph context
Status Codes:
Examples:
rockingTransformCheck.cpp.

MStatus MDataBlock::setContext ( const MDGContext &  ctx  ) 

Set the dependency graph context for this data block. The context is used to specify how a dependency node is going to be evaluated, thus replacing the context for the given datablock. This does not modify the dirty state of the datablock so that they apply to the new context.

This function should not be used for timed evaluation.

Parameters:
[in] ctx the dependency graph context
Returns:
Status code
Status Codes:

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