Forum : Photosynth Lounge

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Topic: Help, question

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joecaraccio (Over 1 year ago)
I need to basically create my school out of photos, a walkable interior of the school. SO my goal would be to make a user be able to enter through the front door, and explore the area, walk down halways, etc. I had taken thousands of photos hoping to be able to do this with Microsoft Photosynth but it does not appear to work, because it is more panoramic. Does anyone know what this concept is called and/or how I could do it. Really any help would be so great, I neeed this for school. Thanks so much!
Nathanael (Over 1 year ago)
Hi, Joe, 

If you're hoping for a complete 3D model, I can tell you right now that you won't be fitting your entire school into a single photosynth. 

If you're wanting a 3D model and you're not that interested in presenting your audience with the input photography, then Photosynth may not be the tool for you. Look up Computer Vision and Photogrammetry. The Photogrammetry Forum keeps a list of related software. http://pgrammetry.com 

Be forewarned, though, that all of the photogrammetry tools listed there will take a serious amount of manual interaction and editing to get something like a complete 3D model of your school.
Nathanael (Over 1 year ago)
In reply to your observation that, for your purposes, "Photosynth ... does not appear to work, because it is more panoramic", I would have to disagree with you. 

Photosynth's mobile apps only deal in panoramas and the website does support uploading panos from Microsoft ICE http://bit.ly/msrice and Photoshop http://bit.ly/pstops on Windows, however the original Photosynth desktop application which you have used to upload your tests on your profile is not intended for creating panoramas and is well capable of going far past where any panorama stitcher has gone. 

In order to get good results, however, you will need to learn to shoot photos in a way that Photosynth can use to the best effect. 

To this end, please download the Photosynth Photography Guide, available as a PDF or XPS here: http://photosynth.net/help.aspx#photosynthhelp

You can also benefit from watching the Photosynth beginners' video crash course here: http://bit.ly/howtosynth
Nathanael (Over 1 year ago)
If you'd like more of an explanation from me, please read through this discussion: http://bit.ly/sinkorsynth
Nathanael (Over 1 year ago)
I had meant to mention that when I looked at your test synths I saw a few things that are hurting your attempt to synth your school: 

:: In many cases, your school's walls and floors do not have any distinctive visual texture or pattern to them. Photosynth's image matching works by matching visual patterns (specifically it looks for corners and blobs with unique arrangements of light around those corners and blobs), so things like concrete, gravel, stone, grass, sand, brick, tree bark, wood grain, etc. all work great, but flat white walls with no pattern on them or hundreds of brown floor tiles with no speckles visible on them or anything else to make them unique from each other gives Photosynth nothing to lock onto, visually.

If you load your test synths in either the Silverlight or the Direct3D viewer and use the [P] key to toggle to the point cloud and then use the period key [.] or [Spacebar] to advance through the photos you'll see what Photosynth tracks.
Nathanael (Over 1 year ago)
:: In addition to your somewhat difficult choice of subject, a fair number of your photos are blurred. This will not help you. 

I speak from personal experience here, so don't feel like I'm criticising you personally. I understand that you were likely in a hurry and your test probably wasn't meant to be your showcase of your best work, but I'm just letting you know.

:: In some cases, you actually did shoot more like a panorama than a photosynth. If you'd like to try these shots as an actual panorama, try stitching them with Microsoft ICE and uploading them to the website, but know that each panorama on Photosynth.net remains a standalone experience for the time being, sadly.

If you don't have time to read through my sinkorsynth link above, then just know this: in order to get a good 3D model from photogrammetry programs, you will want to photograph a stationary rigid subject from multiple camera angles - angles which are not *too* far apart from each other.
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