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Nearly Raw Raster Data (NRRD) is a data format and toolset for describing volume dat

The NRRD website includes extensive details, examples, conversion utilities, resources, and references.

NRRD and the corresponding teem software library facilitates the pre-processing tasks (cropping, quantizing, resampling) of volume data. It also helps with the basic analysis tasks which help to understand the structure of a dataset (histograms, maximum intensity projections, connected components).

Example X3D scenes utilizing NRRD have been prepared by Virginia Tech (VT) Visionarium research group and are published as part of the X3D Basic Examples: Volume Visualization scene archive.