challenge_2.md

Challenge 2: Recovery of Generic Object Scans

Given a partial object scan, X, the goal is to recover the complete scan, Y.

This challenge uses the 3DObjectTex dataset.

Training data

Provided:

1. A set of complete scans, Y.

Not provided:

1. The partial scans, X. They are generated by the participants.

Evaluation data

Provided:

1. A set of partial scans, X.

Not provided:

1. The ground-truth scans, Y. (They will be released after the competition.)

Evaluation

Considered for the evaluation:

• the shape,
• the texture.

See evaluation for the definition of the metric.

Submission format

The predicted complete mesh, Y', should be in .obj or .npz (see formats).

The mesh colour information should be either:

1. a single texture atlas,
2. or RGB colour stored as vertex attributes.

A mixture of vertex colour attribute and texture mapping is not allowed.

The mesh geometry may be different than the input, X.

The submission must be a .zip archive that unfolds in this directory structure:

  eval/
    <scan_name>/
      <scan_name>-completed.(npz|obj)
    .../

where <scan_name> correponds to the name of the input scan.

Directory structure of the dataset

The data files are arranged in the following directory structure:

  train/
    <scan_name>/
      <scan_name>.obj
      <scan_name>.mtl
      <scan_name>_0.png
    .../
  test/
    <scan_name>/
      <scan_name>.obj
      <scan_name>.mtl
      <scan_name>_0.png
    .../
  eval/
    <scan_name>/
      <scan_name>.obj
      <scan_name>.mtl
      <scan_name>_0.png
      <scan_name>-partial.obj
      <scan_name>-partial.mtl
      <scan_name>-partial.png
    .../

For each scan, there is one subdirectory with a unique <scan_name>, e.g. model_1, model_1208... The files are:

• <scan_name>(.obj|.mtl|_0.png) = Y: The ground-truth mesh, i.e. the raw scan.
• <scan_name>-partial(.obj|.mtl|.png) = X: Partial scan generated from Y.

See formats for the mesh format.