Dealing with parent/child relationships and updating transform | Bevy | Page 1

upper narwhal Apr 11, 2023, 11:20 PM

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I guess these two problems are actually one in the same

upper narwhal Apr 11, 2023, 11:43 PM

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winces maybe something like this?

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fn render_rotation(
    mut query: Query<(&mut Transform, &AntAngle, &AntFacing, Entity), Changed<AntFacing>>,
    mut fixed_query: Query<(&mut Transform, &Parent), With<FixedRotation>>,
) {
    for (mut transform, &angle, &facing, entity) in query.iter_mut() {
        let angle_radians = angle as u32 as f32 * std::f32::consts::PI / 180.0 * get_xflip(facing);
        transform.rotation = Quat::from_rotation_z(angle_radians);

        fixed_query.iter_mut().for_each(|(mut transform, parent)| {
            if parent.get() == entity {
                transform.rotation = Quat::from_rotation_z(-angle_radians);
            }
        });
    }
}

It could be made more performant and generic by trying to run it as a separate stage and zeroing out global transform.

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but then there's be de-sync between the two until that stage runs which is maybe less desirable

upper narwhal Apr 12, 2023, 12:01 AM

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mmm

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I think I might use the parent/child hierarchy but without a SpatialTransform in the parent so that I have a relationship in name only

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move the position etc all to the child sprite

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and then watch for that changing and search for related labels by identifying shared parent

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I think that's the best I can do

#Dealing with parent/child relationships and updating transform