RealFlow Wisdom

RealFlow blog: Tips, Technics and Scripting.

Sun simulations (revised)

I was doing some R+D about solar filaments with RealFlow, you can find very cool references at this website http://www.helioviewer.org/.

This is my personal approximations to this kind of phenomena. I have simulated this using Fibers emitters and some scripting lines to emit from them.

The movement of the fibers is achieved thanks to a Noise and Attractor Daemons, these make collide with the sphere. You can increase the number or particles make the sphere emit more particles from vertexes.

I used a Simulation Event script to get emitted particles from the particles driven by the fibers, you can download the script and the scene from here.

Scripting is, in most of the cases, the way you could get more control over the simulation and the most spectacular effect.

Due to several requests I am going to explain the steps to get the correct results in the scene provided:

To obtain the correct results is needed two simulation steps.

  • Simulation Step 1:
    • Once loaded the scene, Activate and make visible the Fibers node.
    • Deactivate script from the Simulation Event panel switching off the scripts.
    • (Optional) You can retime this simulated particles if you see they move too quick.
    • Simulate.
  • Simulation Step 2:
    • Make sure you have loaded in the Binary Loader the particles simulated in the previous step.
    • Deactivate and make visible the Fibers node.
    • Activate the scripts  from the Simulation Event panel switching on the scripts.
    • Simulate.

I hope this helps.

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May 21, 2012 Posted by | Particle Base Fluids, RenderKit, Scripting | 1 Comment

Evaporation

Having a look to this reference video for a possible project I get to work on it.

At the beginning I tried to get something similar in RealFlow using a simple set up with filter daemons and supported by some python scripting which generate some trail particles, the main concept was to get three layers of fluids, water, snow and vapour to render them later using Render Kit.

Once finished the simulation I started to test with Mental ray/Render Kit using  Mesher, Particler and Cloud in Maya. Although I did not spend a lot of time on the vapour particles to get a good behaviour as mist I think it could get better results transferring the particles to a Mist Domain with a high-resolution to obtain a good volumetric effect.

The fact is you can get really good results using Maya Fluids and RealFlow simulations, in this example I used two layers of particles rendered by using RFRK and another layer using the snow particles from RealFlow as Fluid emitter in Maya.

I want thanks to Florian Koebisch from NextLimit forum his advises about Maya Fluids.

August 17, 2011 Posted by | Daemons, Particle Base Fluids, Render, RenderKit, Scripting | , , , , | 7 Comments

Looking for presets

Two years ago I wrote an article talking about Presets for RF4. This article is off-line now. Anyway that article was based on RF4 but due to some changes in RF5 the performances are different now and more accuracy. You can see some of the videos I did in the RF YouTube channel (Prefix “Preset”).

I would be very glad to reproduce that article here but I have not access to it by now, for that reason I was making several sims to compare for my own. (Videos are HD, it is recommended see ing the videos at full screen. The other parameters not evaluated are set by default)

These are the results.

Density: 250, 1.000, 3.000, 1.0000

The Densities does not use to affect the motion of the fluid,  you can only see the difference using two different fluids with different densities or involving dynamic bodies in the simulation, in the next example the object has a mass of 4375 units, approximately same density as water (1000 units) the fluid has different densities.

Density: 100, 1.000, 10.000, 50.000

The different Viscosities are more evident in the next examples.

Viscosity: 3, 5,  25, 100

In the case of the Surface Tension you can see more particles are grouped when higher values are used in the surface tension parameter.

Surface Tension: 2, 10, 25, 100

But the best way to see the effect is using less particles.

Surface Tension: 0, 1, 10, 100, 1.000, 10.000, 100.000

October 14, 2010 Posted by | Particle Base Fluids | , , , | 5 Comments