I have some particles moving over a path using position POP and also use a velocity node to orient them according to their head direction on the path.
So I wanted to add to them a little move like a slightly noise, so I tried to use a translation POP node with a expression on the X axis to make them zigzag a little, but the problem is they do it according to the world axis not according to each particle local axis.

Is there a way to to that?

Thanks

If you use the Drive Particles > Noise tool, you'll note that it simply uses a Force POP with parameters on its Noise tab.

Hummm

I'll Try that.

I'll post later the results.

It doesn't work with the particles being driven by the position tool.

Any more tips?

Try playing with the normals? $NX, $NY, $NZ

Make sure the source geometry has normals, add them with a Point SOP.

The help on the Transform POP is a bit misleading. It gets you all excited when it talks about points having a local orientation then lets you down in reality when it just adds a world transform to the points and it “translates the local coordinate system”. In itself this is handy but…

I built a quick VOP POP network to do what you want: move the points in the local frame of reference in x.
Add a proper up vector with UpVector POP.
In VOPs use a Cross Product VOP to build the X direction vector from the v and up.
Use the x vector to modulate the point's position with some noise.
Done.

You can do the same for the y up direction.

Now you are free to use the Rotation POP to bank them along the z velocity direction and the points will move according to the local cooordinates.

WOW!!!

Thanks man, that helps a lot, that is exactly what I was after.

I made a ramp that controls the Z angle by life so I can bank the particles at any part of the path, thats cool.

Do you know any way to add rotation to the other axes following the local orientation as well?

I tried to use the rotation POP but I couldn't find a way to make it work.

But thanks you very much everybody for the help.