[Opensim-dev] Texture UUID in XML File

Wed Aug 5 20:20:31 UTC 2009

Thanks for all of the ideas everyone. I will look into libOMV to see if it
can help us. Some of the members on this project are Graduate Compter
Science students (including myself since I got the task of implementing
this). So hopefully we can work with the code without too much hassle. If we
have any more questions, we'll be sure to ask.
-- Steve

On Wed, Aug 5, 2009 at 4:08 PM, James Stallings II <
james.stallings at gmail.com> wrote:

> Steve,
>
> It sounds as if you probably are planning to reload a saved object after
> the fact of modification. In that event, you wont need to modify the texture
> in the asset database, nor muck about with databases and their tables.
>
> Sounds like a pretty interesting project :) but as Teravus says, you will
> likely have to use libOMV (http://openmetaverse.org) to decode the texture
> entry in the xml file.
>
> You will need someone who is a fairly proficient coder to work with this
> library - all the details such a person will need can be found at the site
> referenced above.
>
> If there is any way in which I might further assist you, please feel free
> to give me a shout.
>
> Cheers!
>
> James/Hiro Protagonist
>
>
> On Wed, Aug 5, 2009 at 3:00 PM, Melanie <melanie at t-data.com> wrote:
>
>> The asset database has nothing to do with what you want. You can
>> decode and recode the texture entry quite easily, and just replacing
>> the UUID is trivial.
>>
>> Melanie
>>
>> Stephen Carroll wrote:
>> > Thanks for the information Melanie and James.
>> > So you believe the better way to do this is provide a web for to
>> directly
>> > modify the MySQL database that holds the assets information? Admittedly,
>> I
>> > know little about MySQL and so I knew I could work with the xml files.
>> > Perhaps some more information about my project is in order. I am working
>> > with a team of college students and faculty at my university to create a
>> > website that will allow building a virtual area in a virtual world. For
>> > example, a prebuilt object would exist in an avatars inventory on
>> OpenSim.
>> > This object would be a prebuilt building, such as a museum, classroom,
>> > conferenceroom, etc. We call this object a template. The template would
>> also
>> > have locations on the wall reserved for pictures. So the user would
>> choose
>> > through the website that they want to use the museum template, with
>> specific
>> > already in OpenSim images for specific image locations. Then the user
>> would
>> > click a "build" button that rezzes the customized template.
>> > To accomplish this, each template has already been built in OpenSim and
>> then
>> > saved into its xml format (using the save xml2 command). When the user
>> > selects what template and what textures they want to use through the
>> website
>> > interface, a program would go through the xml file and replace the
>> default
>> > template's texture information in that file with the texture information
>> > related to what was chosen on the website. This creates a new xml file
>> that
>> > contains all of the information necessary to rez a customized building.
>> > As I already have rezzing the template in OpenSim through the website
>> and
>> > saving the chosen pictures through the website, all I thought was needed
>> was
>> > replacing the texture information in the template xml file with the
>> texture
>> > information chosen from the website. That is why I was wondering where
>> the
>> > texture information is stored in the xml file. But it sounds like you
>> are
>> > suggesting I deal directly with the asset database instead of changing
>> the
>> > xml file? Are all linked prims that make up an object stored neatly in
>> the
>> > database and is the texture UUID also stored neatly in the database with
>> the
>> > linked prims that make up the object? To me it sounds like directly
>> > modifying the database is more work than necessary but what do the rest
>> of
>> > you think?
>> > Thanks,
>> > Steve
>> > On Wed, Aug 5, 2009 at 3:01 PM, Melanie <melanie at t-data.com> wrote:
>> >
>> >> That string is a base64 representation of the binary texture entry,
>> >> which contains texture, color, offset, rotation, scale, etc.
>> >>
>> >> Melanie
>> >>
>> >> Stephen Carroll wrote:
>> >> > Hello,
>> >> > My name is Steve and I am working on a web interface that will allow
>> >> > changing textures on prims in OpenSim. I have got a web interface to
>> >> process
>> >> > the save xml2 and load xml2 commands thinking I could modify the xml
>> file
>> >> > itself to set the texture UUID to what is chosen on the website. I am
>> >> > confident that I can write a program to modify the xml file, but I
>> can
>> >> not
>> >> > see where the texture UUID is stored in the xml file. Looking through
>> the
>> >> > xml file generated on a test object after issuing the command "save
>> >> xml2", I
>> >> > see a line that looks like:
>> >> >
>> >>
>> <TextureEntry>i1/sZY2NncXNqI/fJxbjYQAAAAAAAAAAgD8AAACAPwAAAAAAAAAAAAAAAAAAAA==</TextureEntry>
>> >> > It looks to me that the above line tells OpenSim what texture to
>> apply to
>> >> > the object when the object is loaded with the command "load xml2".
>> But I
>> >> do
>> >> > not see a connection between this string and the UUID of the texture.
>> The
>> >> > texture's UUID is not in the xml file though. So where is the texture
>> >> > information stored in the xml file? Does the <TextureEntry> line have
>> >> > anything to do with identifying what texture to apply to the object?
>> Is
>> >> > there a reference manual that says what parts of the xml file are for
>> >> what
>> >> > in OpenSim?
>> >> > Thanks,
>> >> > Steve
>> >> >
>> >> >
>> >> >
>> >> >
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