add a plane behind donut
in geometry node, add -> points -> distribute points
add -> geometry -> set position
add -> utility -> random value
change to random to vector type
add -> geometry -> set position
hover over offset field, press I to insert a frame at #0
shift + right arrow to go to the end frame #100
change offset, press I to insert key frame again
press space to play animation
right click on set position -> delete key frames
add -> input -> value
input value #frame. during animation frame # will be the value
add -> search -> combinedXYZ
only offset value in z axis
press space, points move in z axis
select divide node -> ctrl + J to create annotation
press N to open property window
connect speed of animation to x axis also
reference:
https://www.youtube.com/watch?v=oA4maNXlIf0
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