Multiple GameObjects Issue

[tchemaly]

Code works great when I have one game object and one transform. However, when I have multiple game objects and corresponding transforms, the code switches between them and is stuck on one object where the position of one object is being updated and that of the others is not. Any thoughts?

[franklinwk]

Assuming the OpenIGTLinkFlag is set up correctly on all the objects, it's possible that this is a problem with a newer version of the OpenIGTLink protocol since this repository has not been updated in several years. Also possibly a problem with the names of the transforms on either end.

[tchemaly]

OpenIGTLinkFlag is set up on all the objects and Receive box is checked.
The names are correct because I did Debug.Log inside the if statement that checks they are equal, and all is good there.
It seems like the transforms are not received in parallel but there is rather a switching between them. Do you have any suggestions?

[franklinwk]

I would try with an older version of OpenIGTLink and see if that's the problem. Maybe OpenIGTLink Protocol version 2. http://openigtlink.org/developers/spec

[tchemaly]

Thank you @franklinwk
I will let you know how that goes.

[dallen-28]

Hi @tchemaly, just wondering if you ever found a solution to this issue? I am having the same problem

[KeiranCantilina]

Hi @tchemaly and @dallen-28 ,

I managed to solve the problem by removing the queue of ReceiveTransformMessage coroutines in OpenIGTLinkConnect and instead replacing it with an array of single-packet-width buffers, one buffer for each tracked object in the scene. Also, transforms are matched to scene objects by tags, not object names. This results in better performance and prevents problems that can occur with duplicate object names.

The downside is now only the most recent transform for each gameobject is retrieved every update, and all previous transforms are thrown away. If you just want to track objects and don't care about recording all transforms, this should be fine.

See my fork of this repository at https://github.com/KeiranCantilina/OpenIGTLink-Unity

[Zzc-ZHAO]

Hi @tchemaly, just wondering if you ever found a solution to this issue? I am having the same problem