On Thu, Mar 10, 2016 at 12:21 AM, Margaret Hu <margaret.ss...@gmail.com>
wrote:
> Sean:
>
> >>Not really — that is your job to propose a best candidate — but we do
> keep notes on our geometry conversion desires in our TODO file. There is a
> section entitled >>CONVERTERS that pertain to our conversion interests.
>
> Thanks for the information, looking at the CONVERTERS section in the TODO
> file and checking the current status of src/libgcv. It is obvious that the
> work should be obj, stl, vrml. Some work has already started at the obj
> part, the lex/yacc grammer/token is already there while stl and vrml exists
> only as a skeleton directory. Unless using the asset import library is
> planned in the immediate future, it seems working on obj, stl, vrml format
> is a reasonable start.
>
> Is there a SVN checkout of the test cases for the src/conv directory,
> where can I find some small yet representative 3D files of various format?
>
>
>
Hello,
It is probably better to start out with the obj and stl formats. AFAIK
support is rather widespread among 3D tools and the formats themselves are
easier to comprehend. vrml is a rather complicated file format and not all
applications support it well. In addition vrml was superseded by x3d (an
even more complex standard). The only standard as complex as x3d in the 3D
file format world is probably collada. i.e. the 3D file format to rule them
all... which didn't. Both x3d and collada are XML based so you would need a
XML parser and then parsers for those higher level formats as well. Hard to
do in the time of the GSoC unless you use an utility library (or several)
and add extra dependencies.
Just my 2 cents here.
> On Tue, Mar 8, 2016 at 2:13 PM, Christopher Sean Morrison <brl...@mac.com>
> wrote:
>
>> Hi Margaret,
>>
>> will investigate CMake online, should not be too hard, will first try to
>> build all executables from source in Ubuntu 14.04, (I downloaded
>> brlcad-7.24.2.tar.gz). Can you point me the documentation of the build
>> process, such as : configure, make all, make install.
>>
>>
>> Like most open source software, see the README and/or INSTALL files. ;)
>>
>> Have investigated some of the source code, raytrace.h seems to be an
>> important file to get familiar with,
>> most of the data structure is similar to "union tree" which is like
>> base-class derived-class kind of approach in C.
>>
>>
>> Indeed, old school tricks for “object-oriented C”.
>>
>> The src/libgcv directory already have something called bot which seems to
>> be related to 4 file formats
>> OTYPE_DXF OTYPE_OBJ OTYPE_SAT OTYPE_STL
>> is the above 4 format done already? if not perhaps I can start with the
>> one that is not yet finished? or perhaps some other simpler format.
>>
>>
>> You’re in the wrong directory. I believe you are referring to
>> src/libged/bot_dump.c which implements mged's bot_dump command. Unrelated.
>> Please revisit/recheck the list of filepaths provided on the wiki page
>> and make sure you’re using an SVN checkout.
>>
>> I also find the following link helpful
>> https://en.wikipedia.org/wiki/Category:CAD_file_formats
>>
>>
>> In that list and important is
>> https://en.wikipedia.org/wiki/CAD_data_exchange
>>
>> But I did not investigate those format in detail.
>>
>>
>> That is one of many things you will need to do in order to make a
>> successful proposal.
>>
>> wonder if you can give me some hints of what is the best candidate format
>> for this project.
>>
>>
>> Not really — that is your job to propose a best candidate — but we do
>> keep notes on our geometry conversion desires in our TODO file. There is a
>> section entitled CONVERTERS that pertain to our conversion interests.
>>
>> Cheers!
>> Sean
>>
>>
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>
>
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--
Vasco Alexandre da Silva Costa
PhD in Computer Engineering (Computer Graphics)
Instituto Superior Técnico/University of Lisbon, Portugal
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