Messages

1

Python and Java API / Chunk AlignCameras in 1.6

« on: February 28, 2020, 12:52:07 PM »

We are updating our python script to 1.6 using the change log to tell us what has been renamed (no deprecation warnings...) at the bottom of this resource: https://www.agisoft.com/pdf/metashape_python_api_1_6_1.pdf

Maybe I am blind, but I cannot see anywhere in the change log that mentions a new parameter 'reset_alignment' to Chunk.alignCameras. To make matters worse, this new parameter defaults to a value that changes the result of the function rather than a value which would keep the result consistent with 1.5.

2

Python and Java API / Re: Camera orientation

« on: December 19, 2019, 03:48:03 PM »

To solve this, I had to use the chunks coordinate system; the camera transform and chunk transform was not sufficient. I think 'internal coordinate system' turned out not to be what I wanted. Please see these links:
https://www.agisoft.com/forum/index.php?topic=7999.0
https://agisoft.freshdesk.com/support/solutions/articles/31000145016-how-to-calculate-estimated-exterior-orientation-parameters-for-the-cameras-using-python

3

Python and Java API / Re: Camera orientation

« on: November 08, 2019, 12:47:56 PM »

Hello Llama,

Is the chunk you are working with referenced or transformed (whether chunk.transform.matrix is not an identity matrix)?

The chunk is referenced, chunk.transform.matrix is not the identity. If I perform chunk.transform.matrix.mulv( v ) the value is still not what I expect

4

Python and Java API / Re: Camera orientation

« on: November 07, 2019, 08:05:38 PM »

Hello Llama,

I suggest to use the following vector:

Code: [Select]

v = camera.transform.mulp(camera.sensor.calibration.unproject(Metashape.Vector([camera.sensor.width/2, camera.sensor.height/2]))) - camera.center
print(v.normalized())


Hello Alexey, thank you for your response.

This gives a very similar vector. Is this vector in the same coordinate system as the 3 axes as in my screenshot?

In this screenshot I am looking down the X axis, and the camera clearly appears to be facing predominantly in the negative Z direction, why then is the Z positive and its Y component larger and negative?

Apologies if I'm missing something here

5

Python and Java API / Re: Camera orientation

« on: November 07, 2019, 05:52:53 PM »

Also may I ask how to set the ground height in the Python API?

6

Python and Java API / Camera orientation

« on: November 07, 2019, 05:38:32 PM »

I am trying to get the direction vector of my cameras in what I think is the internal coordinate system, to go on to detect cameras that aligned facing upwards. Here is my current attempt:

Code: [Select]

for camera in chunk.cameras:
    if camera.transform and camera.selected:
        print(camera.transform.mulv(Metashape.Vector([0,0,1])).normalized())

I would expect the result in my screenshot to have a large -Z component, and low X and Y components since this camera is pointing straight down. However, it has quite significant X and Y components. I suspect I'm missing something obvious here, but any help would be appreciated.