This tutorial looks at how to use a popsolver to shape a fluid simulation so that a fluid object transforms into a second fluid object.
This first part looks at the basic setup, creating points that fill the letters, using an attractor pop and using the ability of the flip fluid solver to turn off solving for a subset of particles, a feature that allows us to reduce jiggle.
The project file is at sites.google.com/site/pqhoudinitutorial/
Note: in H12 you will need to turn off reseeding particles on the flip solver for this to work. I've included an H12 scene in the project file.