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Thanks for the information. And I tried to spawn a child actor at a certain position, but it did not, it seem like the actor constrained to the parent even before it spawned. Is this a GS thing too?

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One question about your Fast Constrain v2, why does the child disappeared if I move it to the lower layer than the parent?

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Do a search for @Socks' fast constrain demo. That can do what you seem to be asking. Unless what you're asking is closer to what @tatiang suggests.

Now, the circle starts to rotate, which means that the green dot needs to move with the circle because they are attached. Therefore I think I need an equation showing the relationship between the rota

Yes. Fantasy Nations has a choice of languages including English and Chinese, and more languages can be added if a new translation done. What I did is put a language determine attribute.

when i press left move change attribute flip horizontally to true and change game.position to 1

@Socks no, I agree that it's possible to store/save an expression value in an attribute. I was referring to the concept of somehow storing/saving an expression without needing attributes (or tables).

Step 3: If I have multiple actors selected like in step 1 and then release the mouse button I will change an attribute called SwipeActive to true. If I retract the swipe back to the original actor, th

In the past there was no numeric expression, only attribute. So it's partly that numeric expression was a feature addition and they couldn't remove attribute as it was used in lots of projects. That s

Yes I know, but then what purpose does attribute serve - its essentially a nerfed version of numeric expression?

So, yeah, what the difference between the two when stating the condition for a rule?

instead of booleans for each type of action, I prefer to have one integer state attribute: