imagery embeded into E57 files

[antoinebio]

hello @dgirardeau

Is it possible to get the pose of imageries stored into E57 files (along with laserscan point) after E57 import ?
The idea is to import photo & external orientation to map a 3D mesh model created on the pointcloud.

Here is an example of a E57 file well being read by CLOUD COMPARE (with Imagery)

many thanks
antoine

[prascle]

Hello,
Have you tried asking your question on the CloudCompare issues? It looks like a question on CloudCompare. I'm not very familiar with the E57 format and I'm not sure I understand the question...
Best regards,
Paul

[dgirardeau]

@antoinebio This information is not extracted unless it's a simple pinhole camera (that CC can handle as a 'CameraSensor'). Currently, if it's another projection (fisheye, etc.), then it's ignored.

[antoinebio]

@dgirardeau , @prascle hello and thank you for the reply.
actually the issue is the following.
I've received a E57 file, containing several TLS stations embeeded in that single E57 file.
please note that each of TLS also contains cubic map imageries. https://en.wikipedia.org/wiki/Cube_mapping
when I load that E57 file into CC, spatial information (or pose) of cubic map image is well being read. No issue;
(The idea is to import photo & external orientation to map a 3D mesh model created on the pointcloud)

now I want to break down those TLS stations and split that single E57 into several E57 files, one per station.
so I pre-process the E57 file in order to break it down into several E57 files per scan station.
I use that script command :
CloudCompare -O <my_single_E57_file>.e57 -C_EXPORT_FMT E57 -SAVE_CLOUDS

but we noticed the resulting E57 files lost spatial information and drop metadata of cubic map image, even though images are well being stored...
when We check the XML structure of the resulting files (using e57xmldump.exe), The images are described by the visualReferenceRepresentation structure. This structure can be used for viewing, but is not suitable for evaluating the position of the scanner in space, so apparently CC skips such images metadata...

does it come from CC library ? Am I understanding well ?
antoine

[dgirardeau]

Ah sorry, I missed this message, as I don't deal with CloudCompy!

See my answer here: https://www.cloudcompare.org/forum/viewtopic.php?p=29762