flickering pyro - especially after converting particles to vdb

 Say you've made some nice particles and you give them density/burn/temperature and then convert these to VDB fields. You might find they flicker ever so slightly during rendertime. This is to do with a changing grid size. The "fix" is to make a gigantic box shaped VDB that encompasses the area of your particles/sim and plug this into the second input of the VDB from Particles node. Now the grid is fixed and you shouldn't have any more related flickering!

Pro tip from Walter.