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Description
Ground material was set to "inked sketch" like everything else (previously it had shadow composed of a smooth gradiated tone which was rather jarring).
The upper and lower parts are from two separate renders, composited together in Photoshop. The problem was if the tread were lit brightly enough to see the wheels, the upper section was too washed out. So two renders were made, with dim and with bright lighting, and the best bits were used from each.
This technique looks very much like pen-and-ink/scratchboard illustration. Reminds one of the illos done by Vincent di Fate for Analog magazine.

Description
Ground material was set to "inked sketch" like everything else (previously it had shadow composed of a smooth gradiated tone which was rather jarring).
The upper and lower parts are from two separate renders, composited together in Photoshop. The problem was if the tread were lit brightly enough to see the wheels, the upper section was too washed out. So two renders were made, with dim and with bright lighting, and the best bits were used from each.
This technique looks very much like pen-and-ink/scratchboard illustration. Reminds one of the illos done by Vincent di Fate for Analog magazine.