Forum : Advice & Critiques

Can’t seem to get something to synth right? Curious about what lens is best? Ask your fellow Photosynthers here.


Topic: HELP!

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jwking (Over 1 year ago)
Hi my name is Josh and I am currently working on a research project. 

I have a Gigapan Epic 100 I am using to take panoramas of parts of the forest. I need to turn these into 3D point clouds and then take the data and put it into a single xyz coordinate axis.

I have just been doing some test pictures so far. But when I look at the 3D point cloud it is patchy. If you look at my account the specific picture is labeled test_1. Is there anyway to fix this?

Thanks so much!!!
Nathanael (Over 1 year ago)
Hi, Josh, 

Photosynth can only create point clouds for parts of the scene seen in multiple shots and that would explain why you're seeing bands of points (where your columns of photos overlap). 

Photosynth can only estimate depth for a portion of the scene that is seen from multiple perspectives, however. It is not sufficient when creating a photosynth, rather than a panorama, to shoot from a single perspective. 

Since you have a great panoramic head to work with, I'd try taking a minimum of two panoramas several feet from each other to give Photosynth some parallax to work with and put both sets of photos in a single synth. That should result in a much more constant point cloud and given the multiple perspectives, should take you away from the flat sphere of points that panoramic shooting yields. 

For more on how to get the most from Photosynth, please read the Photosynth Photography Guide available from: http://photosynth.net/help.aspx#photosynthhelp
Nathanael (Over 1 year ago)
As for merging multiple point clouds into a single XYZ coordinate system, look up the weblogs of Josh Harle, Kean Walmsley, Henri Astre, Nathan Craig, and Mark Willis.
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