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Dear Webots community,

I'm currently trying to obtain the global position of a Transform (An attached part of a robot's body). I now that the supervisor_API gives the possibility to get the position of a node. However, as stated in in the documentation:

"If the requested node does not exist in the current world file or is an internal node of a PROTO, the function returns NULL"

Is there any way to access the nodes inside a Proto file using one of the supervisor options (by def, by id, etc.)?

Thank you very much in advance,

Best regards

Jan-Felix

Jan-Felix Klein
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2 Answers2

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It's indeed not possible by definition to access the internal nodes of a PROTO from a Supervisor.

To get the position of any part inside a PROTO, you could include a GPS node where you want in the PROTO; the GPS API can retrieve the GPS node global position.

FabienRohrer
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With the latest versions of Webots, it is now possible to access internal nodes of a PROTO from a Supervisor. You should use the new wb_supervisor_node_get_from_proto_def Supervisor API function. Once you obtained a pointer to the node, you can access its fields as you would do it for a normal node.

Olivier Michel
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