Hello, running BRL CAD on Ubuntu. Trying to export my project as a dxf. I did this:
g-dxf test.g front_panel.s -o test.dxf
And it produces some console output but no dxf file. I also get:
db_lookup(-o) failed: -o does not exist
The tutorial pdf is ambiguous as to the order of the options. It also is ambiguous as to whether o or -o should be used. Can I just see an example of what to do? Thanks!
Why isn't dxf an option in the export menu in mged?
Is it possible to export to 3ds file format?
Running g-dxf without any arguments provides the following usage:
Order of operations spelled out there indicates the -o option comes before the .g and object names. Running "g-dxf -o test.dxf test.g front_panel.s" should work in your instance.
DXF isn't an export menu option in mged simply because nobody has written the code to add them yet. There is an open to-do item to add them, but all of the devs are fully taxed on other tasks right now. What you can run within mged is the bot_dump command IFF the object you're trying to export is already a polygonal mesh. That command has internal support for outputting directly to dxf, stl, and a variety of other formats. Again, though, the object has to already be a BoT mesh entity (see the 'facetize' mged command or the facetall.sh script in a source distribution).
BRL-CAD presently does not have a 3ds exporter.
Hmm, I thought I had tried that order, but I think the problem was that in the tutorial pdf, on page 37 it says
"o output.dxf "
rather than "-o output.dxf" which I should have tried.
Thank you! I did that, and it produced a dxf file, but I get
_db_walk_subtree() FAIL on '/front_panel.s'
What does that mean?
Looks like I got a lot to learn but BRL-CAD is looking perfect for my needs right now.
Wow. You know, that's one of those things that you look at dozens of times over the years and don't see it until someone points it out! I never noticed that Vol IV doesn't prefix the command options with the requisite dash. Coincidentally, we're in the process of working on updating those tutorials and other documents too. I changed the (216) various instances referring to options so they all list the dash now. Thanks for noticing and pointing it out!.
Many of the tools, dxf-g included, only recognize solid geometry so they expect a group or region combination (i.e., an assembly or a part in other terms), not a primitive. If you add that primitive to a simple group and request that be converted instead of the primitive, it should proceed just fine:
g mygroup front_panel.s
Or if you really wanted to structure it properly and mark it as a proper solid region, it'd be something like:
r myregion.r u front_panel.s
g mygroup myregion.r
g-dxf -o file.dxf myfile.g mygroup
Volumes II and III introduce groups and regions across a series of tutorials and explanations but the MGED Quick Reference summarizes it al in a simple little diagram.
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