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I see what you did.
First things first: What you need to do:
If you want to continue to work on the existing animation, select environment3:pPlane1; if you want to start over, select environment3:polySurface25 and Delete by Type: History.
Now to explain what happened:
The grid that’s falling over has a lot of history, including a Combine operation (a polyUnite) that left an animated transform. When you do a Combine, Maya keeps the transforms of the objects that participated in the Combine operation, but creates a new shape node with its own transform for the resulting mesh. Those original transforms is not in the hierarchy of the grid, so you don’t immediately see where the animation is coming from.
To illustrate, Let’s say you have object A and object B. B is static, but A is animated.
A is the transform node, and AShape is the mesh. If you do a polyUnite with A and B, you’ll get a new mesh with it’s own transform, polySurface1. The shape node will be polySurfaceShape1.
A is still there, and so is B, but you no longer see the AShape and Bshape. Instead, there will be an empty hidden transform node under A and B. These hidden transforms, (transform1 and transform2) are the new parents for AShape and BShape, who are also invisible, because their .interMediateObject attribute is set to true. If you turn that attribute on, and make the hidden transforms visible, you can see the original objects that were united.
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