Contest Track - Structural Shape Retrieval


The contest track on structural retrieval requires the participant to retrieve a ranked list of models, given a query for each class. The retrieval method used is advised only to depend on the characteristics of the shape and should be able to capture, explicitly or implicitly, information about the morphological arrangement of the main parts, or features, of the shape. The models in the dataset will not contain other information than its mesh.

For example, the models below (a) can be judged to have a similar structure, while the models in (b) do not have a similar structure.

Data set

The track features a new set of 3d models, which are mainly new and build from shapes never used before during previous years of the contest. The models have been gathered and constructed with structural differences in mind. Features like protrusions, holes and concavities characterise the 3d shapes found in the repository. The models will not contain any metadata or colour. 

The shape repository contains 200 models. The models are classified in 10 main classes. Each main class contains a pair of (two) subclasses. Each subclass therefore contains 10 models. Matching models from inside a class are highly relevant and matching results between models the two pair class are marginally relevant.

An example of the used format and the quality of the shapes can be found here:

Method Evaluation

The performance of the shape retrieval will be measured using 1st and 2nd tier precision and recall, finally presented as the F-measure. This measure gives a nice overview of the complete retrieval performance and the method especially, since the repository is similar for all participants. Read more…

Competitor procedures and schedule

1.   November 21, 2008: Website online / Call for Participation

2.   December 16, 2008: Participants can register for this track by mailing to both jhartvel"@" and michi"@" before this registration deadline.

i.     Supply the registration message with enough information like names, institution, contact information, etc.

3.   December 18, 2008: Confirmation of registration will be send to all participants.

4.   January 10, 2009: The full contest repository will be made available on this website. The competitors can start evaluating their methods. Update: The models are now available!

i.     Participants will submit their results by email, following the format as described in the repository readme file.

ii.    Participants are allowed to send up to four lists of results generated with different parameters or algorithms.

5.   January 17, 2009: The filled result files are returned by email.

6.   January 20, 2009: The resulting scores will be made available.

7.   January 24, 2009: deadline for sending the short papers including the results. The short papers will be included in the proceedings.


The track of SHREC 2009 called "Structural Shape Retrieval" is organised by Jurrian Hartveldt (Utrecht University) and Michela Spagnuolo (IMATI). SHREC 2009 is an initiative of the Network of Excellence AIM@SHAPE. To contact the organisers, send a message to shrec”@”


This SHREC ’09 contest track is focused on the retrieval of 3d models which exhibit a relevant similarity in the shape structure.

Track description

The structural retrieval contest track requires the participant to retrieve a ranked list of models given a query for each class. The retrieval method used is advised only to depend on the characteristics of the shape. The models will not contain other information than its mesh.

(a) Structurally similar                                                            (b) Semantically similar (but not structurally similar) 

News and updates can be found here