Hi everyone, thanks for checking my quesiton.
I baked an geo into brickmap then read it in houdini, used Pref(rest position) to stick the baked information onto the deformed one. It works well.
When I copy this object onto a box's points with copy sop, it works fine.
the problem is:
When I use point instance, it doesn't work. It seems that the point instance didnt read my pref attribute in, or something other got wrong.
please check my attach file.