hi , i'm learning particle using houdini. i attached the hip file (h9).
the animation show the particle is following a path. At the beginning it looks ok,but when it turn left it doesn't look right.
maybe the method i used is wrong, since i have no idea other than using the ‘sort’ node. so can anyone help me to create the smooth crawling ?

thanx

I'd try animating the painted trail, or use an animated curve on top of the grid that uses an attribute transfer to draw a coloured path.