Hello TanguyG:
Hi! I’d like to spawn multiple entities of a model in my world using the SDF world/population element following this tutorial and although the SDF element is recognized (I get an error if I dont define the population name) and I dont get any errors, nothing appears in my world nor in the entity tree.
Please note that the tutorial is part of Gazebo Classic and you are using the new Gazebo, particularly Garden. You can check the feature comparison of the two different Gazebo in the documentation. Seems like the support for the populations is not yet implemented in the new Gazebo.
As a workaround, maybe the ERB templates can be useful for you, you have some nice examples in the gz-sim examples directory:
Hope it helps.