Agisoft Metashape

Agisoft Metashape => Python and Java API => Topic started by: 3DWinter on November 16, 2020, 11:44:39 PM

Title: 'NoneType' object has no attribute 'chunk'
Post by: 3DWinter on November 16, 2020, 11:44:39 PM

Hello Agisoft support,
I have worked for  six years with Photoscan and no Metashape, and have coded in python outside of the Agisoft environment for longer. Now I am taking my first steps using Methashape Python API, and I got stuck on what seems to be a straightforward first step, defining the document object and creating the chunk.  I have searched the forum as well to some extent on Stack Overflow and could not find a solution that would resolve my problem.

Basically, after I create a document and try to create a chunk,

Code: [Select]

Import Metashape
doc=Metashape.app.document
chunk=doc.chunk I get following error:

Code: [Select]

AttributeError                            Traceback (most recent call last)
<ipython-input-2-e7bf1adf3fae> in <module>
      1 #create a processing parameter object
      2 doc=Metashape.app.document
----> 3 chunk=doc.chunk

AttributeError: 'NoneType' object has no attribute 'chunk'

So it seemes like the process of creating the document object is failing- is None. Though the manual states requirements are Python 3.5, I am using Python 3.7.6 becuase that was what I already have, and Python Wheel for Windows is labeled 1.6.5-cp35.cp36.cp37-none-win_amd64.whl, so I don't think that should be the problem.

thanks

Title: Re: 'NoneType' object has no attribute 'chunk'
Post by: Alexey Pasumansky on November 17, 2020, 08:46:10 PM

Hello 3DWinter,

Metashape.app.document returns the active project instance only for GUI mode, so if you want to create a new project using script run from the command line (in headless mode) you should use the following approach:

Code: [Select]

import Metashape
doc = Metashape.Document()
chunk = doc.addChunk()
...


Title: Re: 'NoneType' object has no attribute 'chunk'
Post by: 3DWinter on November 17, 2020, 10:21:09 PM

Thanks for that.

 I tried looking up references in the manual to working in headless mode and I found none. Even no mention of using Metashape.Document().

thanks