Foliage, organic object and flat elements

[Hollyg]

Hi there,

I mainly use Photoscan to model interiors/exteriors etc. Recently, I have been trying to use it to model smaller things. Generally my tests have been very successful until I started trying to model bushes, ferns, flowers etc. My results have been ok, but not great...I'm wondering if this is a limitation of the software or if I need to approach taking the photos and altering my settings for this different task? Any help much appreciated.

I wondered if my problems had something to do with slight movement in the organic plant or the small/flat depth of the leaves. Therefore I did a test using random shapes cut from a sheet of plastic. I took a good amount of photos of this arrangement of plastic pieces...however, I was faced with the same problem when processing; the software had difficulty in modelling the depth of the plastic pieces. Anyone got any thoughts/insight?

Best
Holly

[FoodMan]

well, I think flat thin objects are a problem atm.. Pscan has very little info when a leaf is seen from its side, and so to get connected front back is indeed an issue..

f/

.. but maybe Alexey has a point on this...?

[Alexey Pasumansky]

Hello Holly,

The only hint is to use background for estimating correct camera positions. But even they are estimated correctly there are likely to be problems with combining two surfaces. Due to the minimal distance between them there could be holes in such flat objects. So the solution may be in combining two scenes in the external 3D editing software. But for natural scenes with a lot of leaves this trick probably wouldn't work.


I have seen the result of rose reconstruction (http://vimeo.com/38028070) but I'm not sure if PhotoScan result wasn't edited.

[FoodMan]

Nice Rose, thanks for the link and advice Alexey..

".....Agisoft Photoscan 3D .obj output imported into Zbrush for further editing/rendering"

[Alexey Pasumansky]

Hello FoodMan,

As we can see, there are still small holes in the bottom parts of the rose.

[FoodMan]

hey..

well yes I've seen it, but still, it's a nice work.. and a nice demonstration of PScan power.. 

[Hollyg]

Hey Alexey and Foodman,

Ah ha! Ok, Thanks very much for your help, Photoscan has been amazing and impressed me considerably with its power and what it can produce so far! I'm working on a film at the moment and we also use lidar scanning for the sets (Lidar also has problems with plants and trees), but photoscan provides a mesh quicker and is automatically textured. The rose does look good, I wonder how much it was edited?

Thanks again
Holly