To move the light position in the interactive RTI, make sure the lightbulb icon in the bottom right corner is highlighted rather than dark then click and drag across the viewer.
To pan around the image, turn the lightbulb icon off, and click and drag across the viewer.
Use the layers icon to enable enhanced views of the RTI, including diffuse and specular (mathematical enhancements that remove colour and increase contrast), and normals (a false-coloured static view of the surface profile).
This brush head was washed up and found on the foreshore of the River Thames. RTI has bought it back to life, revealing how over time water, sand and mud has become embedded and changed the surface texture of this object.