Photogrammetry problems.

Great_OZ

Hi. 
First of all i dont got a big expensive studio or anything near that.
i wanted to try out photogrammetry...
i have been trying with different objects at different time of the day but have not gotten any great results yet. so now im posting in here to gain some knowledge from experienced people.
i'm using a canon eos 1100D and took alot of pictures of this statue and when i upload all the pictures to Agisoft photoscan, Click align photos when its done the program focuses on everything els than the statue there are some pictures below to show it. i did the photoshoot  turntable'ish
 
Another thing. Why is it not possible to align photos at high every time i do it i get this error message (Not enough memory.)? i got like 16GB ram??

ElleKitty

I havent done this much myself, but I've seen others walk around the model instead of turning the model around (unless in a specially made studio for this kind of thing). In your first picture, the backgrounds seem very similar from picture to picture, when the software probably expects them to be different every time.

Additionally, when you turn your model outside of perfect lighting conditions (wide circular light, directly from the center-top), you are also changing the shading of the model. So she may have a shadow on her belly, but in the next picture, the shadow may not be there, and this likely confuses the software (reflections confuse these programs even more). That's one other reason to try and walk around the model.

Outside of this, probably someone more experienced than me could expand on it.

cabooes

I'm not sure if you found an answer to your problem but here's some possible solutions that could help. On the statue put some sort or markers around it that way Photoscan has an easier time aligning the photos. Another would probably to increase the key points 100,000 and the tie points to 80,000 or so. Higher numbers of course will increase process time. Plus aligning on high should still be fine. In the preferences under the GPU tab check also if you have the option checked to "Use CPU when performing GPU accelerated processing." 

Cheers!

Noors

Yes the issue it that you should turn around your model and not turn the model.

The software "dumbly" tries to detect similar patterns between pictures to set a 3d space.
The statue changes but not the background + lighting changes, so the software is confused.

Nothing should change but your position in space.
Though, in case you can't reshot, or have no choice, you should atleast mask the background in all pictures, which can be automated in photoscan, or imported from photoshop w/e.

ew necro, didn't see...

kurt_hectic

Please watch this:
https://www.youtube.com/watch?v=Ny9ZXt_2v2Y&feature=youtu.be

and this:
https://www.youtube.com/watch?v=GFX-ZL7oTPc