change gravity at runtime

[muttistefano]

Hello All,
I am trying to change gravity in runtime by using :

gz service -s /world/world_demo/set_physics --reqtype gz.msgs.Physics --reptype gz.msgs.Boolean --timeout 2000 --req 'gravity { x: 0 y: 0 z: -2.8 }'

which returns :
data: true

The problem is that in the simulation, the gravity does not change.
I tried multiple physics plugins, and none of them allow this change.

I don't know if it's related, but I get this output on the gz terminal when I make the first call to the gz service to change gravity :

[gazebo-2] [Wrn] [Component.hh:144] Trying to serialize component with data type [N2gz4msgs7PhysicsE], which doesn't have operator<<. Component will not be serialized.
[gazebo-2] [GUI] [Wrn] [Component.hh:189] Trying to deserialize component with data type [N2gz4msgs7PhysicsE], which doesn't have operator>>. Component will not be deserialized.

Am I doing something wrong, or is this simply not implemented?
Thanks.

[iche033]

looking at the code, I see that set_physics eventually just sets step size and rtf. I also noticed that gravity is only set when the world is first created. So looks like changing gravity through set_physics is not supported yet.