Simple Rigid Body Object was added to the Scene( Fluid to Object Coupling)

Support User Generated Forces

Support user generated forces
Instead of voice volume input, I use mouse motion to generate the force added to water. Now, it supports user generated forces. When the user drags the mouse, generate a corresponding wave.

Including these processes:
1、Screen To World

2、Mouse Pick Ray

3、Ray Intersection

4、Force Generation

Demo:

An introduction to openFramework

An simple introduction to openFramework
website: http://www.openframeworks.cc/

openFrameworks is an open source C++ toolkit designed to assist the creative process by providing a simple and intuitive framework for experimentation. The toolkit is designed to work as a general purpose glue, and wraps together several commonly used libraries, including:

• OpenGL, GLEW, GLUT, libtess2 and cairo for graphics
• rtAudio, PortAudio or FMOD and Kiss FFT for audio input, output and analysis
• FreeType for fonts
• FreeImage for image saving and loading
• Quicktime and videoInput for video playback and grabbing
• Poco for a variety of utilities

The code is written to be massively cross-compatible. Right now we support five operating systems (Windows, OSX, Linux, iOS, Android) and four IDEs (XCode, Code::Blocks, and Visual Studio and Eclipse). The API is designed to be minimal and easy to grasp.

Simply put, openFrameworks is a tool that makes it much easier to make things with code. We find it super useful, and we hope you do too.

openFrameworks is actively developed by Zach Lieberman, Theodore Watson, and Arturo Castro, with help from the OF community. openFrameworks is indebted to two significant precursors: the Processing development environment, created by Casey Reas, Ben Fry and the Processing community; and the ACU Toolkit, a privately distributed C++ library developed by Ben Fry and others in the MIT Media Lab's Aesthetics and Computation Group.

3D Version of Tides

3D version of height filed water simulation
So far, we extend the 2d version to 3d version, rendering with cubes，you can see the cubes clearly when closing up, which we will work with in the next process.
The force added to the left-up of the water is still controlled by voice volume.

There is also a link to the video: http://youtu.be/92EHZ6hGztA

Interactions between heightfield water and object

There are several ways to deal with the interaction between fluid and rigid body:

Quote:
There are mainly two different ways of interacting with a height field. Either the height field and flow are modified directly or the boundary conditions are modified.
The first approach is used in [CL95, Tes04a] to simulate the motion of rigid objects. In the approach used by [Tes04a] the height of the water is in-creased in front of a moving object and decreased behind it. When an object is submerged the height is increased above it corresponding to the volume of the object and when an object emerges the height is decreased. This approach can also be used to add and remove water.
The other approach is to use handle interaction by applying pressure. When an object is floating in the water pressure is applied to the height field resulting in a lower height below the object.
End Quote  --from Real-time Interactive Water Waves(KTH computer Science and communication)

In this project, we are tyring to use the method discribed in Wave Particles(Cem Yuksel, Donald H.House, John Keyser) for the Fluid to Object Coupling  part.

• The buoyancy force:

 

• The dynamic forces:  are computed over the interface of fluid and object and they are based on the relative motion of the object sufface to the fluid.  The dynamic force consists drag force and and lift force, they can be computed by the following fomula:

The mechanism of Object to Fluid Coupling is shown briefly in the following picture:

2D Version of Tides

2d version of height filed water simulation
We use openFramework, It provides GLSL shader sample code as well as audio input.

The physically simulation code part is written by ourselves.

In the pictures and video, the left channel shows the height changes of water, the right channel show the change of voice volume.
And the start force add to the left-up of the water is controlled by voice.

Alpha Version Review of TIDES

A video will be here

Timeline of TIDES

Our project can be broke into 3 stages:

• In the first stage,  the height field water simulation with particles will be implemented.

• basic physics for object interactions in 3d.

• GLSL real time rende, adding more details to the water.

About TIDES

This is our final project for Physically Based Animation course.    

We will use height field method to do the main water body simulation, and add SPH particles for the details like sprays, splashes and individual water drops. We will also implement basic physic interactions of rigid body objects in 3D.

References:  

1.   Two-way Coupled SPH and Particle Level Set Fluid Simulation( Frank Lpsasso et. al)
2.   Real-time Simulation of Large Bodies of Water with Small Scale Details( Nuttapong Chentanezz and Matthias Muller)