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− | * | + | * Note: The following is from a thread on the BRL-CAD help forum |
+ | (http://sourceforge.net/mailarchive/message.php?msg_id=1010480): | ||
− | + | A user on the BRL-CAD help forum recently asked twenty rather | |
+ | insightful and detailed questions regarding MGED that I felt would be | ||
+ | a good idea to share with those on the mailing lists as well. Some of | ||
+ | the questions frequently come up in discussion, so hopefully these | ||
+ | answers will be of use to many others out there as well. Also, note | ||
+ | that some of the questions are covered in the BRL-CAD tutorial series | ||
+ | available at http://brlcad.org under the Documents section. Users are | ||
+ | encouraged to suggest other documents and documentation that would be | ||
+ | of use. As always, if folks aren't happy with an answer or state of | ||
+ | affairs, please feel free to post a feature request at | ||
+ | https://sourceforge.net/tracker/?group_id=3D105292&atid=3D640805 (with | ||
+ | one request per submission and lots of detail). The questions from | ||
+ | this particular user along with my answers are provided in following | ||
+ | below. | ||
+ | |||
+ | :Cheers! | ||
+ | |||
+ | :Sean | ||
+ | |||
+ | ---- | ||
'''Q1:''' | '''Q1:''' | ||
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:way I'm doing it is by making inner and outer walls using rcc and trc | :way I'm doing it is by making inner and outer walls using rcc and trc | ||
:primitives, and I have figured out that I need to make a combination | :primitives, and I have figured out that I need to make a combination | ||
− | :of the two, then hide the primitives and draw the comb, and then do | + | :of the two, then hide the primitives and draw the comb, and then do rt |
− | :to see the finished product. That's | + | :to see the finished product. That's all well and good. But if I |
:translate or rotate the inner wall, for example, away from the point | :translate or rotate the inner wall, for example, away from the point | ||
:of creation, I cannot seem to figure out a way to restore it to its | :of creation, I cannot seem to figure out a way to restore it to its | ||
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:just lacking a drop-down box because there are generally '''way''' too | :just lacking a drop-down box because there are generally '''way''' too | ||
:many primitives for that to be a useful selection mechanism with any | :many primitives for that to be a useful selection mechanism with any | ||
− | :real model and | + | :real model and it's use is often discouraged for other reasons (it's |
− | :'''very''' | + | :'''very''' succeptible to human error that in ways that are difficult to |
:recover from--use with caution). Type the name of the primitive | :recover from--use with caution). Type the name of the primitive | ||
:you wish to edit into the 'Name:' field and hit enter. The values | :you wish to edit into the 'Name:' field and hit enter. The values | ||
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'''Q7:''' | '''Q7:''' | ||
:When trying to translate a combination, where is the 'Z move'? I | :When trying to translate a combination, where is the 'Z move'? I | ||
:see only 'X move', 'Y move', 'XY move'. Answer: You may have to select | :see only 'X move', 'Y move', 'XY move'. Answer: You may have to select | ||
− | :the combination and use the | + | :the combination and use the translate or tra commands to reposition |
:the object. | :the object. | ||
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'''Q8:''' | '''Q8:''' | ||
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'''Q11:''' | '''Q11:''' | ||
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:answer is "yes". You can raytrace from any azimuth/elevation as well | :answer is "yes". You can raytrace from any azimuth/elevation as well | ||
:as from any arbitrary view whether ''panned'' or not. By default in | :as from any arbitrary view whether ''panned'' or not. By default in | ||
− | :mged, when you run | + | :mged, when you run rt, it will invoke the raytracer with a view that |
:matches the geometry window's view so if you're not in an edit mode, | :matches the geometry window's view so if you're not in an edit mode, | ||
:you can change the view to whatever you want without editing or | :you can change the view to whatever you want without editing or | ||
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'''Q15:''' | '''Q15:''' | ||
− | :How do you make a | + | :How do you make a nonsmooth surface such as a corrugated circular |
:surface surrounding a cylinder? | :surface surrounding a cylinder? | ||
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'''Q19:''' | '''Q19:''' | ||
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'''Q20:''' | '''Q20:''' | ||
:When I shift and rotate geometry around so that it fits into the | :When I shift and rotate geometry around so that it fits into the | ||
− | :viewing area (a) does that actually reposition the geometry to a new | + | :viewing area, (a) does that actually reposition the geometry to a new |
− | :place, or is that just visual | + | :place, or is that just visual? (b) Is there a 'reset' or 'undo' |
− | :command to reset the geometry to its original position | + | :command to reset the geometry to its original position? Is there a way |
:to precisely re-zero the geometry? | :to precisely re-zero the geometry? | ||