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
- 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.
| File name/URL | File size | Date submitted | |
|---|---|---|---|
| chain2.g | 104 bytes | January 14 2015 05:00 UTC | |
| chain2.png | 25.0 KB | January 14 2015 05:00 UTC | |
| chain2.1.g | 13.8 KB | January 14 2015 05:05 UTC | |
| chain2.1.g | 19.3 KB | January 14 2015 06:01 UTC | |
| chain2.1.g | 22.7 KB | January 14 2015 15:44 UTC | |
| chain2.1.g | 25.7 KB | January 14 2015 16:04 UTC | |
| chain2.1.g | 25.8 KB | January 14 2015 16:22 UTC | |
| chain2.1.g | 25.8 KB | January 14 2015 16:33 UTC |
I would like to work on this task.
This task has been assigned to Raptor. You have 100 hours to complete this task, good luck!
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O), what is the underlying?
Raptor, this is creative and nice, but it looks like you didn't define any regions in your model. This means while your model does define some shapes, it doesn't define physical geometry that illsEach object that would be a stand-alone piece of metal (e.g., each link and each peg) should be a separate region (and conventionally have a .r suffix on the name. Would you make those edits please?
the "BRL-CAD" was so close! ... are you going to go back to work on that one?
Yesgoing, but it's betterto upload moreready)))
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A region is a building part of the over all geometry. In this sense cil2 isn't one but 6 regions/parts. Same for the other regions. As the links_down and links_top can be moved to each other they won't form a fixed shape.
I.e. you should split up every of your region in 6 regions.
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The regions are OK and the grouping of the regions is OK too - but you should set the color in the regions, not in the higher groups.
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The top level group containing all relevant elements is missing.
And, when you are on it, you can remove the region_id attribute from cil1, cil2, links_top and links_down.
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Congratulations, this task has been completed successfully.