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The port could be in also use by any other program that could have nothing to do with any other OptiTrack product. You can try to change the port number in the examples to see if it makes the difference.

I do not know VB, but you can check that the NatNet DLL is present in the system folders or in the working directory of your application.

[quote=smith32]I'd really appreciate some C code that uses the NatNet SDK to create a client.
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They are already several source code examples in the SDK distribution

Thank you Vincent. Being able to change address and port in unicast/multicast would be great!

<r>Hello,<br/> <br/> could it be possible that Tracking Tools or Arena could have an additional option to set the multicast address and port for streaming?<br/> <br/> I have made a few changes to the PacketClient example in NatNet 2.1 SDK to having it work under Linux. The command part works fine, b...

Tracking Tools and Arena send data to 224.0.0.1 and port 1001.

<r>Hi Doug,<br/> <br/> thank you very much for all the debugging information. I could see the red rays aiming to my markers, so I went to the cloud reconstruction parameters and found that the "maximum ray length" and the "minimum angle" values were far different from the Arena default ones. After c...

<t>Hello Vicent,<br/> <br/> when trying to calibrate with TT, I do the wanding process sucessfully. All the cameras have an "Excellent" rating. The problem comes with the second step, the setting of the ground markers. No 3D points are shown on the 3D visor. The frame information reports 36 "2D mark...

<t>I'm having the same problem:<br/> <br/> - Same version of Tracking Tools (latest, downloaded today).<br/> - Calibration files obtained with Arena, later loaded into TT.<br/> - Tracking Tools in "Status: Live Video" mode.<br/> <br/> I can't see any 3D marker on the screen, although they are certai...