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).
The initial photography determines the quality and magnification possible in the finished RTI. In this case, a 100mm macro lens, and an approximately 1mm sphere were used to create an RTI of a fabric sample where individual wool hairs are clearly visible. This makes it easier to analyse features such as the angle and direction of twist in the yarn.
A sample swatch of woven wool fabric, created to test different weave patterns and densities. The rows of pink thread mark different sections, such as the more open plain weave in the middle and the denser weave below it.