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Creates a 2D transfer function for use with the VolumeShader and other 3D rendering constructs. The two dimensions of the transfer function are intensity on the x-axis, and gradient on the y-axis. The transfer function than thus alter fragments of a dataset based not only on the fragment's data value, but also the rate-of-change of its data value relative to its neighbouring fragments. This can be useful to help highlight boundaries between different regions or materials in a dataset.

Default label: "TransferFunction2d Builder"
Member of plug-in: Data analysis
Catalogue path: Data analysis/Transfer functions

Inputs:
Volume data		CSIRO::DataAnalysis::Array3dScalar
Classifications	Array	CSIRO::DataAnalysis::TransferFunction2dClassification	A set of classification objects, each of which defines a color for a particular region of the transfer function.
Clear cached data		QDateTime	When this dependency input is updated, the gradient data cached by the operation will be cleared, enabling it to be re-generated.
Outputs:
Transfer function		CSIRO::DataAnalysis::TransferFunction2d
Gradient image		QImage	An image representation of intensity (x-axis) versus gradient (y-axis).