Hello Brian,

you can manipulate the pointarrays by using a combination of split points and point ext. Here you can insert other values for the xlength, ylength and zlength - inner organization of pointarrays. I've attached an example.

>>>>The other question is whether concat and concat2 are the same.
Concat2 was created as a time were the concat command was splitted in seperate nodes for numarray pointarray and objects. Max has them joint together also - the only difference today is the maximum number of inputs and the naming of them.

>>>>BatchPts and concatPts seem to do the same thing?
I think you mean bundlePts vs. Concat in Point mode. the difference is in the order. Concat takes a pointarray and adds a second one. BundlePts takes the first point of the first pointarray and than the first point of the second pointarray and places them to the output array - and so on. So you can create e.g. points on different curves, bundle them and draw new curves across the base curves.

Have a nice day
Karsten

p.s.: If you want to use curve instead of convertPts you have to set zlength and xlength in the pointExt node;-)