Model a bicycle chainBRL-CAD
Status: ClosedTime to complete: 100 hrs Mentors: Sean, DishankTags: modeling, CAD, design, chain, 3D

BRL-CAD provides several ways to model 3D geometry including a graphical tool named mged, another named archer, and various ways to create geometry using scripts. We use 3D models for development and to showcase our features. You can learn the basics of 3D modeling in just an hour or two using our tutorial documentation.

If you haven't yet noticed, our project logo looks a lot like a gear or a couple bicycle chain links. We want you to model an actual bicycle chain with 2-to-10 links.

Model accurate bicycle chain links using the below references. Your job is to model it natively using any of BRL-CAD's tools (i.e., don't model it in something else, don't import anything).

The model should have regions defined for each part (each separate piece of metal becomes it's own region) and no overlaps (use rtcheck and/or gqa commands to verify). Create one top-level combination to group everything together.

Submit a text file or comment describing any resources or web links you used in making your chain and describe your model.

References:
  • http://en.wikipedia.org/wiki/Bicycle_chain
  • http://upload.wikimedia.org/wikipedia/commons/b/b0/Rollenketting.gif
  • http://pardo.net/bike/pic/fail-004/000.html
  • https://www.google.com/search?q=bicycle+chaintbm=isch
  • https://www.google.com/search?q=bicycle+linktbm=isch
  • https://www.google.com/search?q=bicycle+drawingtbm=isch
Modify:
  • Submit your model as a .g file (BRL-CAD's geometry file format) and a rendered PNG image. You can run "rt -s1024 -o your_rendering.png your_geometry.g your_top_level_object" to create a PNG rendering of your model.
Uploaded Work
File name/URLFile sizeDate submitted
chain.png23.4 KBJanuary 12 2015 16:50 UTC
chain.g9.5 KBJanuary 12 2015 16:51 UTC
about this work276 bytesJanuary 12 2015 19:34 UTC
Comments
Raptoron January 12 2015 16:12 UTCTask Claimed

I would like to work on this task.

Daniel_R on January 12 2015 16:49 UTCTask Assigned

This task has been assigned to Raptor. You have 100 hours to complete this task, good luck!

Raptoron January 12 2015 16:51 UTCReady for review

The work on this task is ready to be reviewed.

Ch3ck on January 12 2015 19:09 UTCNice work

Could you just add the text file describing your work?


Cheers!

Ch3ck on January 12 2015 19:09 UTCTask Needs More Work

One of the mentors has sent this task back for more work. Talk to the mentor(s) assigned to this task to satisfy the requirements needed to complete this task, submit your work again and mark the task as complete once you re-submit your work.

Raptoron January 12 2015 19:34 UTC

Thanks for the feedback!

Raptoron January 12 2015 19:34 UTCReady for review

The work on this task is ready to be reviewed.

Sean on January 12 2015 21:35 UTCplease stop

Please stop logging onto IRC to merely post a URL to this task and leave.  This is unnecessary, unhelpful, and rather annoying to others on the IRC channel.  Please read http://brlcad.org/wiki/IRC on proper IRC etiquette.


 

Sean on January 13 2015 03:42 UTCTask Closed

Congratulations, this task has been completed successfully.

Raptoron January 13 2015 04:42 UTC

sorry