Fix switching between earth/mars in atmosphere example

[KategoryBee]

Objective

The keys for switching between earth and mars atmospheres in the atmosphere example currently do nothing. This change restores the functionality.

I'm guessing the issue is from the Atmosphere component changing from using Transform to GlobalTransform directly in Atmosphere::set_default_transform. The example is expecting to iterate over a Transform, never finds one, and thus never changes the atmosphere.

Solution

Change the example to modify GlobalTransform instead of Transform.

It may be preferable to modify the example to insert a Transform in set-up. Let me know if this is the case and i'll update the PR.

Testing

• Tested by running the atmosphere example, hitting the 3 and 4 keys and seeing sufficiently earth and mars like atmospheres, as well as messages in the console.

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[SludgePhD]

Calling single_mut() on the queries instead of iterating would cause a fatal error instead of doing nothing. Might be worth doing, to make issues like this more noticeable.