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I created a group of standard objects (cube, sphere and cone). I applied a Rigid Body modifier to each of the objects with standard settings.

Next, I created a separate file and using the Copy-Paste Objects method, I created three identical groups (A, B and C). How to properly bake the animation so that Group A starts falling at frame #50, Group B starts falling at frame #100, Group C at frame #150?

Here the Floor object is a passive element of the Rigid Body system. But for me, the algorithm itself (sequence of actions) for baking animation in a similar situation is important.

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  • $\begingroup$ Blender version 3.0. $\endgroup$
    – Геннадий Горбач
    Commented Feb 10, 2022 at 13:26
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    $\begingroup$ This has been dealt with elsewhere, but I don't feel like digging it up. The easiest method is probably to animate deactivation on the rigid bodies. Breakable constraints and non-rendering colliders are other possibilities. $\endgroup$
    – Nathan
    Commented Feb 10, 2022 at 17:49
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    $\begingroup$ @Nathan -- actually I took a look and am struggling, as you'll see by my "duplicate collection doesnt add to rigidbodyworld collection" blender.stackexchange.com/questions/253394/… ! Otherwise yes, more or less animating the Dynamic checkbox (and perhaps copy/paste as driver in other objects). $\endgroup$
    – james_t
    Commented Feb 10, 2022 at 18:32
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    $\begingroup$ Your question is a different question, where you are duplicating collections (and the answer is, don't duplicate collections, instead duplicate objects and, optionally, move them to new collections.) Copy-pasting rigid body objects as Геннадий Горбач is doing, between instances of Blender, does not cause this problem (at least in 3.0 +, although it used to.) $\endgroup$
    – Nathan
    Commented Feb 10, 2022 at 18:41

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As stated by @Nathan part of the solution is to animate the Dynamic attribute of the Active RB (on frame 1 uncheck the Dynamic and click on the little dot to its right.

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Then on the "start falling" frame #, click to enable Dynamic and click on what is now a diamond to set another keyframe.

Then on that animated object, right-click on Dyamic and Copy as New Driver,

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and paste onto dynamic of all the other objects in that group.

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In this way a change to the "start simulating" frame # on the first single object will affect the start time of the others in (your) Group A.

Now I run into an issue that if I Duplicate the Collection. I am not getting these properly added to the Rigid Body World (a possible bug?).

(Again @Nathan added a similar comment to suggest the following.) So I would next tell you to select all objects withing Group A, "D" (duplicate), and then move all of these to a New Group ("Group B"), and change the keyframe # for when to enable Dynamic simulation.

And so on for your other groups.

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