Motion Blur with Geometry Nodes

In Blender (4.1, at least), geometry nodes actually have motion blur! As far as I can tell, this is achieved by evaluating all geometry nodes at three different points: once when the shutter opens, once when the shutter closes, and once in-between these two times. Then, for all instances with the same ID, their transforms are linearly interpolated between these snapshots.

This means that if you have a lazy list, or anything that continuously moves but snaps back every once in a while, if the shutter overlaps this snap then motion blur will be totally wrong. To fix this, use the “Set ID” node and set the instance ID to something that’s also in the continuously sliding window.