Particle ID is unique, but point index is not. For example, when you delete some particles, their ID is removed from the set, but the point indices will be shifted. So for any particle ID, its index could change from one frame to the next. You might have an occasion when you want to grab an ordered set of locations from a pointcloud, but if there are gaps in the set of IDs, then you can use the point indices as a reliable lookup. So, you can probably think of a few more examples when one or the other would be more useful...
On Tue, Feb 10, 2015 at 12:02 PM, Leonard Koch <[email protected]> wrote: > Just out of curiosity, does anyone know the difference between the ID to > Location and the Point Index To Location nodes? > According to their descriptions they seem to be the same. > Are they actually different or is this just an instance where a node got > built twice by accident? > > -Leo >
