The most important file-format, which can be loaded with Spin3D is the lrn-format. It is basically a text-file consisting of rows and columns containing the dataset's vectors. Each column represents one vector starting with a non-ambiguous key followed by the vetcor's components.
For a more detailed description follow this link.
Once the file is loaded, the first three
dimensions are selected for visualization
(if the vectors are less than three-dimensional,
the second/first dimension will be duplicated).
The component responsible for each axis (x/y/z) can be selected manually.
The lrn-files can be created manually with a text-editor or automatically by any data-generating process.
Some example-files are available
here.