RealFlow Wisdom

RealFlow blog: Tips, Technics and Scripting.

Graph: Adding Age Channel to Domain Particles

Domain particles in RealFlow does not contain any channel to allocate the age value, but this does not mean that you cannot  calculate it. This graph adds a new channel called “age”. It is very useful to do operations with particles like filtering and transferring, deleting or even changes particle properties as we will see in futures graphs. If you open the compress file from the link you will find two folders, the SimulationPre folder contains two graph files that have to be plugged into the SimulationPre folder, in the same order of their names. Inside the StepsPre folder there is another graph file that must be plugged to the StepsPre folder.
screenshot_age1

 

screenshot_age2                       screenshot_age3             screenshot_age4

October 15, 2014 Posted by | Graph, Tips | , | Leave a comment

Silly tips!! – Part I

Here you go some newbie tips I had in the treasure trove, remember them is never a bad idea.

Relaxing fluids:

If you need to a pool of fluid you always need to relax the fluid to get a initial state, you can simulate during a lot of frames.

To accelerate this process you can use a KSpeed daemon activating the  limit&keep option, I use to animate the Simulation attribute in the first frame….

screenshot.91

… and activate the Lock function in the time line, depending on the scene set up it´ll be needed increase or decrease the number of frames for the countdown.

screenshot.93

Breaking patterns:

Usually emitters in RealFlow  have a pattern in the emission, the slices. To avoid them you could use several methods:

  • Use the H/V random
  • Adding some randomness in the emission, you could do this with a simple expression in the speed attribute 4.5+rnd(1), 4.5 is the main speed.
  • You can use a Noise daemon linked to the emitter and bounded to the space icon.

screenshot.95

  • Using droppers, a dropper is a basic geometry to make the fluid collide before to drop down, you can make it simple with planes or modelling it in a 3d platform so you could get nice and realistic patterns.

Simulation in vacuum:

Remember RealFlow is not in essence a Computational Fluid Dynamics software (CFD) and works always in vacuum, so if you would need to simulate with accuracy  you will need to add a second fluid -air- interacting with the main fluid, but this could be against the simulation times.

Sticky Attribute:

It is really important the normals aim to the collision side in order to get correct results, the sticky attribute is a force applied to the colliding particle and is inverse to the geometry normal.

March 20, 2013 Posted by | Tips | , , | Leave a comment

Membrane: Dancing fluids

More old stuff, I did this using Hybrido. I have not enough memory to render it but is cool anyway.

I did it animating a surface geometry in a similar way as a membrane in a speaker, around 25 millions of particles.

November 13, 2012 Posted by | Animaton, HYBRIDO, Tips | , , , | Leave a comment