Click the small triangle at the bottom
of the Diagnostic Shading panel to
show the shading options.
Do any of the following:
Choose the direction of the stripes (horizontal
or vertical).
Use the Repeats slider
to increase or decrease the number of stripes.
Normally the highlights are relative
to the camera, so you can see them “roll” over the surface as you
tumble. Turn on the Lock Texture option to lock
the texture to the surface.