Running the Data Example

[ntseng450]

Hello, the results look very impressive in the paper and I'm excited to try out the repository myself but am having some issues with getting the scripts in the Read-Me to run without error.

I downloaded the data and went to the nerfactor section step 1 for learn data-driven BRDF priors. At this point I don't have data/brdf_merl_npz/ims512_envmaph16_spp1, is this something that needs to be generated with data_gen/merl/make_dataset_run.sh? If so, when I follow the instructions in the data_gen folder, I get the following error message when running data_gen/merl/make_dataset_run.sh.

Training & Validation: 0%| | 0/4 [00:00<?, ?it/s]Loading MERL-BRDF:
/mnt/c/Users/Documents/wrk_dir/data/brdf_merl/Copyright_Notice.txt
Training & Validation: 0%| | 0/4 [00:00<?, ?it/s]
Traceback (most recent call last):
File "/mnt/c/Users/Documents/wrk_dir/code/nerfactor/data_gen/merl/make_dataset.py", line 144, in
app.run(main)
File "/home/user/anaconda3/envs/nerfactor/lib/python3.6/site-packages/absl/app.py", line 312, in run
_run_main(main, args)
File "/home/user/anaconda3/envs/nerfactor/lib/python3.6/site-packages/absl/app.py", line 258, in _run_main
sys.exit(main(argv))
File "/mnt/c/Users/Documents/wrk_dir/code/nerfactor/data_gen/merl/make_dataset.py", line 75, in main
brdf = MERL(path=path)
File "/mnt/c/Users/Documents/wrk_dir/code/nerfactor/brdf/merl/merl.py", line 31, in init
cube_rgb = merl.readMERLBRDF(path) # (phi_d, theta_h, theta_d, ch)
File "/mnt/c/Users/Documents/wrk_dir/code/nerfactor/third_party/nielsen2015on/merlFunctions.py", line 19, in readMERLBRDF
BRDFVals = np.swapaxes(np.reshape(vals,(dims[2], dims[1], dims[0], 3),'F'),1,2)
File "<array_function internals>", line 6, in reshape
File "/home/user/anaconda3/envs/nerfactor/lib/python3.6/site-packages/numpy/core/fromnumeric.py", line 299, in reshape
return _wrapfunc(a, 'reshape', newshape, order=order)
File "/home/user/anaconda3/envs/nerfactor/lib/python3.6/site-packages/numpy/core/fromnumeric.py", line 58, in _wrapfunc
return bound(*args, **kwds)
ValueError: cannot reshape array of size 144 into shape (808591476,1751607666,2037411651,3)

Resolved: need to move the brdfs folder out of the downloaded data and move/delete the Readme inside the folder.

[cjw531]

Here is a more detailed explanation how to address this shape mismatch / incorrectly loaded MERL dataset.