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Thorsten came up with a toy for mass generation of birds. They actually flap wings and appear to go forward, though if you look closely, the swarm goes nowhere.
the main guidance principle for this effect has been that it has to be cheap because the vast majority of users will see it for a few seconds flying past. It's entirely unsuitable for things like following a migratory swarm with an ultralight. You get to see something that looks like birds in the scene - that's basically it.
Birds are largely unpredictable which makes true simulation impossible anyhow. You could follow a group migrating birds but they don't fly indefinitely so now you would have to account for breaks and proper landing areas. Which is infeasible.
to see birds, you technically need to:
- have FG 2016.2+ with a working random objects code
- have random objects on
- run ALS
- fly in a region where they are defined
(Just south-west of Barcelona airport at the river delta is a good place - but it's of course the whole landclass). They're low - some 100-200 m above ground. They're difficult to spot against bright background, but in the morning hours usually appear bright against the dark ocean. And they're small - so you need to get close to resolve them as birds, from the distance they look like dancing sparks or so.