Using streamlines to visualise the fibre and sheet directions in the heart. This first image below shows the results of this example, with the coloured ribbons aligned along the fibre axis with the width of the ribbons aligned with the sheets. The colour spectrum indicates the distance along the ribbon: blue (0) at the start of the streamline and red (100) at the end. The gold ribbons use the reordered fibre tensor to be aligned with the sheet axis with the width oriented to the fibre direction. These streamlines are shown on their own in the second image.