## ICEAttribute.GetDataArrayChunk

### Description

Returns a read-only Array object containing the data defined by this attribute. The data can be accessed in multiple chunks given an index offset that refers to the attribute's global data buffer and a chunk size. This method is particularly useful for minimizing the memory allocation required to store the data retrieved from a very large data set. An empty array is returned if the attribute's structure type is not a singleton.

### C# Syntax

    Object ICEAttribute.GetDataArrayChunk( Int32 in_nOffset, Int32 in_nSize );

### Scripting Syntax

    oArray = ICEAttribute.GetDataArrayChunk( Offset, ChunkSize );

### Return Value

Array

### Parameters

Parameter | Type | Description
--- | --- | ---
Offset | Long | Index offset referring to the global data buffer.
ChunkSize | Long | The size of the data chunk to get.

### Examples

#### Python Example

    #

    # This example shows how to access all attribute data in chunks on a geometry.

    #

    from win32com.client import constants

    xsi = Application

    xsi.CreatePrim("Sphere", "MeshSurface", "", "")

    attrs = xsi.Selection(0).ActivePrimitive2.Geometry.ICEAttributes

    for attr in attrs:

    	if attr.StructureType != constants.siICENodeStructureSingle:

    		continue

    	xsi.LogMessage( "*******************************************************************" )

    	xsi.LogMessage( "Name: " + attr.Name )

    	xsi.LogMessage( "DataType: " + str(attr.DataType) )

    	xsi.LogMessage( "StructType: " + str(attr.StructureType) )

    	xsi.LogMessage( "ContextType: " + str(attr.ContextType) )

    	xsi.LogMessage( "IsDefined: " + str(attr.IsDefined) )

    	xsi.LogMessage( "IsConstant: " + str(attr.IsConstant) )

    	xsi.LogMessage( "Readonly: " + str(attr.IsReadonly) )

    	xsi.LogMessage( "AttributeCategory: " + str(attr.AttributeCategory) )

    	xsi.LogMessage( "Element count: " + str(attr.ElementCount) )

    	if attr.IsDefined == 0:

    		continue

    	# Compute the chunk vector to access the data

    	nChunkCount = 4

    	nChunk = attr.ElementCount / nChunkCount

    	nLastChunk = attr.ElementCount % nChunkCount

    	chunks = []

    	for i in range(nChunkCount):

    		chunks.append( nChunk )

    	chunks.append( nLastChunk )

    	nOffset = 0

    	dataType = attr.DataType

    	for i in range(len(chunks)):

    		nChunk = chunks[i]

    		if nChunk == 0:

    			continue;

    		xsi.LogMessage( ">>>>offset: " + str(nOffset) + " chunk size: " + str(nChunk) )

    		data = attr.GetDataArrayChunk( nOffset, nChunk );

    		nOffset += nChunk

    		for elem in data:

    			if dataType == constants.siICENodeDataFloat:

    				xsi.LogMessage( "float: " + str(elem) )

    			elif dataType == constants.siICENodeDataLong:

    				xsi.LogMessage( "long: " + str(elem) )

    			elif dataType == constants.siICENodeDataBool:

    				xsi.LogMessage( "bool: " + str(elem) )

    			elif dataType == constants.siICENodeDataVector3:

    				xsi.LogMessage( "Vector3: " + str(elem.X) + ":" + str(elem.Y) + ":" + str(elem.Z) )

    			elif dataType == constants.siICENodeDataQuaternion:

    				xsi.LogMessage( "Quaternion: " + str(elem.W) + ":" + str(elem.X) + ":" + str(elem.Y) + ":" + str(elem.Z) )

    			elif dataType == constants.siICENodeDataRotation:

    				xsi.LogMessage( "Rotation: " + str(elem.RotX) + ":" + str(elem.RotY) + ":" + str(elem.RotZ) )

    			elif dataType == constants.siICENodeDataMatrix33:

    				xsi.LogMessage( "Matrix33:" );

    				xsi.LogMessage( str(elem.Value(0,0)) + ":" + str(elem.Value(0,1)) + ":" + str(elem.Value(0,2)) )

    				xsi.LogMessage( str(elem.Value(1,0)) + ":" + str(elem.Value(1,1)) + ":" + str(elem.Value(1,2)) )

    				xsi.LogMessage( str(elem.Value(2,0)) + ":" + str(elem.Value(2,1)) + ":" + str(elem.Value(2,2)) )

    			elif dataType == constants.siICENodeDataMatrix44:

    				xsi.LogMessage( "Matrix44:" );

    				xsi.LogMessage( str(elem.Value(0,0)) + ":" + str(elem.Value(0,1)) + ":" + str(elem.Value(0,2)) + ":" + str(elem.Value(0,3)))

    				xsi.LogMessage( str(elem.Value(1,0)) + ":" + str(elem.Value(1,1)) + ":" + str(elem.Value(1,2)) + ":" + str(elem.Value(1,3)))

    				xsi.LogMessage( str(elem.Value(2,0)) + ":" + str(elem.Value(2,1)) + ":" + str(elem.Value(2,2)) + ":" + str(elem.Value(2,3)))

    				xsi.LogMessage( str(elem.Value(3,0)) + ":" + str(elem.Value(3,1)) + ":" + str(elem.Value(3,2)) + ":" + str(elem.Value(3,3)))

    			elif dataType == constants.siICENodeDataColor4:

    				xsi.LogMessage( "Color:" );

    				xsi.LogMessage( str(elem.Red) + ":" + str(elem.Green) + ":" + str(elem.Blue) + ":" + str(elem.Alpha) )

    			elif dataType == constants.siICENodeDataString:

    				xsi.LogMessage( "String: " + elem );

### See Also

ICEAttribute.DataArray ICEAttribute.DataArray2D ICEAttribute.GetDataArray2DChunk