Ability to step backward few scans when view space
When you walk to something scan by scan, say, A----B-----C-----D(now), to see things, but sometimes you need to see things at C again, it can not easily back to C.
But in reality, it is easy to step back few scans.
I find I did not clear my idea. I should say `step backward` instead of `step back`
I cannot upload the image to the post ( the progress bar say like this: 0% ----1%-----30%----undefined%, maybe issue of my network), so I upload the image to google drive.
If I want see the dinosaur, A scan:
walk a little closer, B scan:
more closer, C scan:
I want more! D scan:
Oops, It is too close to see the Dinosaur, I want step backward to C scan.
I had to turn back, walk to C scan, but in reality, I can step backward to C scan directly!