I stumbled upon this tutorial and I know it originally came from SFX tutorials but I can't find it here.

http://www.wonderhowto.com/how-to-attract-particles-curve-houdini-9-241096/ [wonderhowto.com]

Can someone dig this one out again in its full resolution? The link above goes to a resolution size that does not allow me to read the expressions in the expression editor.

If we can't find this, could someone here give me the correct expression using“opinput” in the point SOP so I can get a point on a curve's normal to look at the next point normal on that same curve? I need to get particles to follow a path. Thank you.

David

point(“../”+opinput(“.”,0), $PT+1, “P”, 0)-$TX

point(“../”+opinput(“.”,0), $PT+1, “P”, 1)-$TY

point(“../”+opinput(“.”,0), $PT+1, “P”, 2)-$TZ

That's it! Thank you sir.

David