This answer proposes that light bars would be better than a single headlight for night time navigation on the Moon because a single headlight will generate hard shadows. Considering this is exactly what sunlight does to the appearance of the skylight-less Moon's terrain for every rover that's been there as well as for the astronauts. (note that humans and some rovers have used binocular vision as well)

But hard shadows generate a lot of potentially helpful terrain information in addition to the loss of information in the dark areas, and this could be quite helpful.

Question: Have lunar (or Martian) rovers exploited shadows, perhaps for terrain comprehension or obstacle avoidance? Has there been any work on this technique or proposed systems that would exploit hard shadows produced either by sunlight (especially on bodies without a sky for fill-illumination)?

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    $\begingroup$ I don't understand the question. Shadows are the only way to see any structure on an uniformly colored surface like on the Moon. $\endgroup$ – asdfex Oct 14 '19 at 10:01
  • $\begingroup$ @asdfex I think you do indeed understand the question and probably have the basis of a good answer! (i.e. on the Moon, shadows are our friends, and getting rid of them (e.g. by using a light bar) might not necessarily be such a good idea.) Here's a photo demonstrating just how bland the moon looks to a rover looking at the antisolar point for example. $\endgroup$ – uhoh Oct 14 '19 at 10:22
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    $\begingroup$ I seem to remember some near escapes where Apollo LRV drivers nearly ended up in a crater because they misread the terrain (due to the strange lighting conditions and lack of visual references for scale and distance). $\endgroup$ – Hobbes Oct 14 '19 at 14:34

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