Uploaded by hdlect on 22.09.2010

Hello, This is JCO with a Realflow 5 High Definition
I am going to talk today about HYBRIDO
HYBRIDO stands for HYBrid larRge dImension LiquiD sOlver
This is the latest approach that Realflow 5 uses for large scale simulations that require
millions of particles
Among the amazing things that HYBRIDO incorporates,
is the capability for automatic creation of what Nextlimit calls secondary particles
such as splash, foam and mist.
These series of tutorials will briefly explain the necessary steps required for setting up
a HYBRIDO simulation.
For the new users of Realflow I will quickly show how to change views
and zoom.
In addition, I will also explain very basic concepts of global and exclusive links
which are paramount for the proper HYBRIDO calculations to be successful.
Then I will give an overview of what HYBRIDO is,
and what are the steps required to setup a simulation that will create a core fluid and
secondary particles.
Another set of tutorials will cover each one of the parameters available for HYBRIDO and
how they have an effect on the simulations.
Later tutorials will show how to bring Realflow simulations into 3D STUDIO MAX and MAYA and
how to produce a final rendered animation.
First I will show quickly how to navigate in Realflow for those who are new to the program.
Let's add an object from the object menu. In this case, a rocket.
There are four basic views: top, front, side, and perspective.
To appreciate better objects and fluids, I need to change the point of view.
This can be done from the top menu if you select view, …point of view…
The shortcuts on the keyboard for the different points of view are:
1 for the top view,
2 for the front view,
3 for the side view or,
4 for the perspective view.
You can also rotate your point of view, but this can only be done if Perspective is the
active window or the active point of view.
To rotate the view, hold the ALT key on the keyboard and your left mouse button simultaneously.
Then, drag in all directions to rotate the view to your needs.
To zoom in and out press the key ALT on the keyboard and at the same time press the right
mouse button.
Then, drag the mouse
up to zoom in
and down to zoom out.
To pan the view, hold the ALT key on the keyboard and press the middle button or wheel on the
mouse and drag the mouse
or down.
In upcoming tutorials I will explain the basics of the Realflow interface. Please come back
to this channel to watch.
Now that I have demonstrated some of the most basic commands we can start with the main
Prior versions of realflow were limited in their capacity to simulate large rough oceans,
waves breaking or crashing on the coast, very big floods, or severe storms.
Trying to make liquids with convincing realism requires to replicate what happens in real
When water hits a rock, rolls over itself, or crashes on a shore, the impact results
in sprays and smaller particles
that tend to be suspended in the air or particles of air suspended in the liquid. These are
the equivalent of secondary particles in Realflow.
In older versions of Realflow we needed to use Phyton scripting to simulate these secondary
Now, Realflow 5 comes prepared with the necessary tools to automatically compute the particles
that will add realism to your scene.
Let's get started so you can see how HYBRIDO works.
The workflow for HYBRIDO simulations is different to what users are accustomed to because everything
will occur in a domain.
In simple words, a Domain is just a container for the simulation.
Domains are created by default with a dimension of 10 meters in all axes.
This picture shows the basic elements required for HYBRIDO:
1. A Domain
2. An Emitter which must be an object. It could be a Realflow object like the ones shown
here or any object imported from an external 3D application
3. We also require Gravity, or any other force that will have influence on the particles
produced by the emitter.
Let's make our first HYBRIDO simulation.
First I add the domain from the top menu.
Another method to get the same results is:
Right click on the nodes window and select Add… Grid Fluid... Domain.
I don't need more than one domain so I will delete the second Domain I created by selecting
it and hitting the delete key on the keyboard.
Then I add and object from the objects menu. In this case I am going to select the cube.
I will scale it by using the shortcut R key on the keyboard or by using the Scale button
on the top menu
and then dragging the handles in all directions that I need to resize until it is the size
I want.
To place the cube in the right position, use the shortcut W, or click directly on the move
option from the menu window.
Once the cube is at the right size and position, I tell Realflow that this object will become
the emitter for the simulation.
To do that, I select the object and click on the Domain menu and select emitter.
Immediately, Realflow creates another element in the Nodes pane called Grid Fluid Emitter
Be aware that the object has to be selected before converting it into an emitter.
If you don't select the object first, a window will pop up asking you to select the element
that you want to become the emitter.
If there are several objects created all will be presented as an option.
I am going to create a sphere to demonstrate this.
To create the sphere, select objects… sphere.
Now, deselect all objects. To do that, click on an empty area of the screen.
Now, select the Grid Fluid Domain.
Add an emitter by selecting… Grid Fluid Menu… and then emitter.
Immediately, a window named select element pops up here you have the option to select
any object that has been created before.
In this case I want the Cube 01 that has been re-sized already. Let's select Cube 01 and
and hit the ok button.
At this point you may be tempted to simulate the animation but we need gravity or any other
force that will affect the liquid
like attractor, wind, noise, etc.
If you don't add any force, then the simulation will proceed, but the liquid will remain in
the same place.
Let's take a look by hitting the simulate button.
The liquid doesn't fall or flow…
Ok, Now that I have shown the importance of adding influence to the emitter,
let's add gravity by clicking on the top menu in the Daemons button and select gravity from
the options below.
Gravity can also be added from the Nodes pane by right clicking inside and selecting Add…Daemon…
Now that we have created a Domain, an object that has been selected as the emitter
and a force that will move the particles, the simulation is ready to run.
By default, Realflow will simulate 200 frames if the scene was created inside Realflow from
If the animation was imported from another 3D application like 3DS Max, Maya or Cinema
Realflow will simulate the same number of frames that were created in that imported
I want to have a longer simulation to appreciate better the fluid falling and crashing. Let's
make it 400 frames long.
These 2 boxes control the length of the animation.
On the left is the last editing frame and on the right is the last simulation frame.
I am going to increase the default number of frames from 200 to 400 by clicking on the
box for last editing frame
which controls simulation duration and typing 400.
Then, I will hit the Tab key to automatically input that same number in the last simulation
frame box.
Now hit simulate to produce the animation.
The time it takes for the simulation to complete depends on the amount of RAM and speed of
the computer.
Before we continue I will delete the elements that we don't need in the scene like the Grid
Fluid Emitter 02 and the sphere
and then I will make the Grid Fluid Domain longer by using the scale option and dragging
the handles.
I will also move the grid Fluid Emitter to the side…
We can simulate by hitting the Simulate button.
At this time, I will pause the recording and show the final simulation produced in the
next video.
Please subscribe to the channel and rate the tutorials. All comments are welcome.