Purpose

Docker container for building RTI models using relight.

Building

docker build -t sepastian/relight-docker .

Usage

This repository includes test images in exmaples/ring.
An RTI model has been build and placed in web.
To rebuid the model follow these steps.

Prerequisite: build the Docker container first, see Building above.

Inside examples/ring are 64 images taken with an RTI dome and a corresponding lights.lp file, describing light positions.
Note that the number of images must match with the number of lines in lights.lp;
file names inside lights.lp must match with names of image files.

Next, use the container to build an RTI model from the images in examples/ring, save the results in web.

$ docker run -it --rm \
  -v $(pwd)/examples/ring:/data \
  -v $(pwd)/web:/out \
  sepastian/relight-docker \
  relight-cli /data /out
Nsamples: 160000
Done in: 6927ms

This creates the following new files in web.

$ ls web
info.json
materials.png
plane_0.jpg
plane_1.jpg
plane_2.jpg

Run an HTTP Server to view the resulting RTI model.

# For example, using Python 3's built-in HTTP server.
python -m http.server

Open http://localhost:8000 in a browser.
You should see an image similar to the screenshot at the top of this site.
Note: Firefox in Linux may not be able to display the results, use Chrome instead.

Options

To display relight’s help message, run:

$ docker run -it --rm sepastian/relight-docker relight-cli
Create an RTI from a set of images and a set of light directions (.lp) in a folder.
It is also possible to convert from .ptm or .rti to relight format and viceversa.
Usage: relight-cli [-mrdqp]<input folder> [output folder]
       relight-cli [-q]<input.ptm|.rti> [output folder]
       relight-cli [-q]<input.json> [output.ptm]
    input folder containing a .lp with number of photos and light directions
    optional output folder (default ./)
    -b <basis>: rbf(default), ptm, lptm, hsh, yrbf, bilinear
    -p <int>  : number of planes (default: 9)
    -q <int>  : jpeg quality (default: 95)
    -y <int>  : number of Y planes in YCC
    -n        : extract normals
    -m        : extract mean image
    -M        : extract median image (7/8th quantile) 
    -k <int>x<int>+<int>+<int>: Kropping extracts only the widthxheight+offx+offy part
Ignore exotic parameters below here
    -r <int>  : side of the basis function (default 8, 0 means rbf interpolation)
    -s <int>  : sampling RAM for pca  in MB (default 500MB)
    -S <float>: sigma in rgf gaussian interpolation default 0.125 (~100 img)
    -R <float>: regularization coeff for bilinear default 0.1
    -B <float>: range compress bits for planes (default 0.0) 1.0 means compress
    -c <float>: coeff quantization (to test!) default 1.5
    -C        : apply chroma subsampling 
    -e        : evaluate reconstruction error (default: false)
    -E <int>  : evaluate error on a single image (but remove it for fitting)
Testing options, will use the input folder as an RTI source: 
    -D <path> : directory to store rebuilt images
    -L <x:y:z> : reconstruct only one image from light parameters, output is the filename

For further information, consult the relight project.

Credits

RTI viewer website based on the original relight project.
Images in examples/ring produced by Nina Kunze, Uni Passau.