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Write a step by step tutorial on modeling a simple toy car with BRL-CADBRL-CAD
Status: ClosedTime to complete:
72 hrs
Mentors: Sean
This task involves writing a tutorial for creating a simple car model using BRL-CAD. This tutorial should be easy for a new user to understand. Use screenshots and images for each step. The toy car model should be such that it can be printed using a 3d printer, which means your model must be devoid of overlaps (run the rtcheck and/or gqa commands in 'mged'). You will need to go through the introductory modeling references below to learn some of the basics of modeling with BRL-CAD.
The output of this task can be a pdf, html, doc, odt or any other document file that contains this article. Submit your .g for review as well.
References:
- http://brlcad.org/wiki/Documentation
- http://brlcad.org/w/images/c/cf/Introduction_to_MGED.pdf
Uploaded Work
| File name/URL | File size | Date submitted | |
|---|---|---|---|
| car.g | 6.4 KB | November 23 2013 14:04 UTC | |
| We are going to create a toy car with BRL.docx | 4.2 MB | November 23 2013 14:07 UTC | |
| Car TUT.zip | 3.5 MB | November 24 2013 07:45 UTC | |
| Revised.zip | 3.8 MB | November 25 2013 10:48 UTC |
I would like to work on this task.
This task has been assigned to Sharan. You have 72 hours to complete this task, good luck!
The work on this task is ready to be reviewed.
Sharan, so this is looking good, but you're going to have to fix the overlaps in car.g that were overlooked when you first modeled it. If you just draw axles.c and run rt or rtcheck, you see that there are overlaps reported. These are due to you having unioned the axlecuts with the axle cylinders without defining a region.
You'll need to change the model. I suggest joining the axles and wheels together by unioning them together into one wheel+axle.r region. It's simple and will be fewer modeling instructions. Note that you need to emphasize the importance of *exactly* lining up the axles with the center of all four wheels or they will not spin correctly. Similarly, the importance of the axles being perfectly perpendicular to the body and parallel to each other or it won't go in a straight line.
Your model should consist of three region objects (created with the 'r' command): one for the body, one for the front axle and front wheels, and one for the rear axle and rear wheels. In terms of 3D printing, a notion of those being the regions of the model are important becaue they are the "parts" that you might individually print with different materials or colors.
As for the instructions, I have more comments, but I'll defer them until after you update the model and instructions+screenshots to reflect the modeling changes. One change to make, however, tell them to use the "erase" command intead of the "d" command. Another, tell them how to move the wheels into position -- this is a tutorial, no? :)
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I might be bad at tutorials because this might be my first text tutorial
Sharan,
This looks a lot better now. The model is nearly perfect. The only issue I see on quick review is that the holes in the car for the axles and wheel wells are not big enough. The precision of most 3D printers requires a millimeter or two separation between all surfaces or it will end up fusing them together.
Make sure the car is approximately 5-10 centimeters long (2-4 inches). At that size, the axle cut and wheel cuts need to provide at least 2mm separation from front.r and rear.r, all surfaces.
Do that and we can call this done, probably create a follow-on task to create a more precise modeling transcript.
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.
I didnt resize the car but I set the correct ratio for the separation;I also added this to the tutorial
Also did a followup on sticker, I think its all right now. -https://db.tt/VeX0O2uU
I am very much interested in modeling tasks, please add more of modeling tasks...:)
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A follow-on task for this tutorial has been posted. Search for "toy car".