问题
I am creating meshes from Tango datasets, trying to support Asus Zenfone AR. My app is already working fine on Lenovo Phab 2 Pro.
The first step is calling Tango3DR_AreaDescription_createFromDataset to create a Tango3DR_AreaDescription. I am calling the function without specifying a loop_closure_database_path in the second argument:
Tango3DR_Status res = Tango3DR_AreaDescription_createFromDataset(dataset_path.c_str(),
nullptr, //loop_closure_database_path
&area_description_raw,
progress_logger,
&num_api_calls);
The Zenfone AR crashes in this function, probably related to this logcat line:
A/tango: loop_closure_file_reader_disk.cc:186 Check failed: generic::DirectoryExists(loop_closure_files_path) Provided root path for loop-closure files /sdcard/config does not exist.
If I specify an empty (but existing) directory for loop_closure_database_path, I get a similar crash:
A/tango: loop_closure_file_reader_disk.cc:293 Check failed: generic::DirectoryExists(descriptor_sub_path) Path for feature-descriptor type /sdcard/testing/lens_invariant_ocvfreak does not exist.
Interestingly, I see that my Phab 2 Pro actually has a directory named /sdcard/config including various files and a lens_invariant_ocvfreak sub-directory. This directory is not present on my Asus Zenfone AR, however.
What can I do to get this working? The documentation in tango_3d_reconstruction.h says loop closure database is downloadable from the Tango developers website, but I can't find it anywhere. I am not entirely sure what is loop closure database is actually supposed to do, but there should be a way to manage without it, correct?
回答1:
New version of library uploaded on https://developers.google.com/tango/downloads which contains the missing file.
来源：https://stackoverflow.com/questions/45594520/using-tango3dr-areadescription-createfromdataset-on-asus-zenfone-ar