SamHancock

You could just use point(“../curvature”,$PT, “curvature”,0) instead.

or add another attribute with that expression so that you can use its local variable.

Does anybody know how to make a local variable if one doesn't exist (without creating another attribute).

To get the volume density into dops, use a sopscalarfield, point it to your volume and set it to the same dimensions as you smokeobject. Also set the time to ‘set always’ and $T. set the data name to something meaningful.

Use the apply data node to attach it to the smokeobject.

And then plug a gasCaluculate into the advection stage of the smoke solver, with that you can max the density field and the one you imported from SOPs…

for the velocities, do the same thing but with a vector field.

I had some reasonable results with:
- cached particles
- on any frame, project UVs onto the points and lock the node.
- copy UV attribute to sim particles

and then I think I used an attribute transfer to get the UVs onto the fluid mesh.

Really simple but it worked for what i needed…