Free-D Protocol, how to use it?

Beginners
1

Hi everyone,

I am currently looking how to use Free-D protocol in Touchdesigner in aim to use coordinates from a real camera.

I founded this informations about XML integration :

[code]<?xml version="1.0" encoding="utf-8"?>
<viz_xml_tracking title=“xml_freed”>

 <checksum pkglen="29"
                      calculation="1">
 </checksum>
 <extraction count="9">
   <axis name="rotx" start="5" len="3" order="bigendian" value="INT32" calc="/ 32768"></axis> 
   <axis name="roty" start="2" len="3" order="bigendian" value="INT32" calc="/ 32768"></axis>
   <axis name="rotz" start="8" len="3" order="bigendian" value="INT32" calc="/ 32768"></axis>
   <axis name="posx" start="11" len="3" order="bigendian" value="INT32" calc="/ 640"></axis>
   <axis name="posy" start="14" len="3" order="bigendian" value="INT32" calc="/ 640"></axis>
   <axis name="posz" start="17" len="3" order="bigendian" value="INT32" calc="/ 640"></axis
   <axis name="zoom"  start="20" len="3" order="bigendian" value="INT32" calc="- 524288"></axis>  
           
   <axis name="focus" start="23" len="3" order="bigendian" value="INT32" calc="- 524288"></axis>                                                                                                                                                             

                <!--example for not define axis ?
    <axis name="iris" calc="!"></axis>
 </extraction>

</viz_xml_tracking>[/code]

Source : [url]http://docs.vizrt.com/tracking-hub-guide/1.0/description_of_the_freed_protocol.html[/url]

My question is how to use this XML code in Touchdesigner to get X, Y, Z axis and rotate coordinates? Is it a WEB DAT node needed to use it?

Any help will be welcome !

Thanks :wink:

2

Hi Julien.

If you append an XML DAT, and set Output , Show parameter to: ‘Attributes Per Column’
you’ll get a more usable table with all the values extracted.
From there you can use a Select DAT to extract columns you need.
Not familiar with the exact protocol, but that might help you get started.

Cheers,
Rob.

3

Hello everyone
May is possible to know if there is any possibilities to implement this protocol ?
It seems is one of the most used tracking with broadcast camera.
Is there chance ?
Thanks a lot