OpenSim​/Wind

FSFW (Simple Fluid Solver Wind) Module

• This is a Wind module for OpenSim
• Project Manager is H.Nishimura
• System Constructor is Fumi.Iseki (Fumi.Hax)

• This module uses Simple Fluid Solver program code by Jos Stam
• This module uses AForge.NET for FFT
   

Demo

• YouTube Demo

Theory of Simple Fluid Solver for Wind

Theory and Original Source Code

• by Jos Stam
  • http://www.dgp.utoronto.ca/people/stam/r​eality/Research/pub.html
  • http://www.dgp.toronto.edu/people/stam/r​eality/Research/pdf/jgt01.pdf　
  • http://www.nealen.net/projects
    • http://www.nealen.net/projects/algoanim/​flowanim.cpp
       

DownLoad

Binary DLL

v1.0.0

• for OpenSim-0.9.2.2 (Mono) SimpleFluidSolverWind.dll (12288Byte)
• for OpenSim-0.9.3Dev (net6.0) SimpleFluidSolverWind.dll (24576Byte)

• AForge.Math.dll http://www.nsl.tuis.ac.jp/DownLoad/SoftW​are/OpenSim/Modules/AForge.Math.dll (68096Byte)

Source Code

Subversion Repository

• • svn co http://www.nsl.tuis.ac.jp/svn/opensim/op​ensim.modules/trunk/Wind
     

Compile Source Code (Linux)

[Download WindModule-x.y.z.tgz]　(x, y, z are integer number)
# cp WindModule-x.y.z.tgz  [OpenSim directory]/bin
# cd [OpenSim directory]/bin
# zcat WindModule-x.y.z.tgz |tar xfv -
# cd WindModule-x.y.z
# ./build.sh                    (if you use 0.9.2, execute ./build.sh 0.9.2)
# cp bin/SimpleFluidSolverWind.dll ..
# cp AForge.NET/AForge.Math.dll ..

Install & Settings

Install

Download SimpleFluidSolverWind.dll

1. Download SimpleFluidSolverWind.dll at this page.
2. Copy downloaded SimpleFluidSolverWind.dll to OpenSim bin folder or directory.
    

Download AForge.NET

1. Please download AForge.NET from AForget.NET Download Page. My recommendation is [ Download Libraries Only ]
2. Extract downloaded zip file.
3. Copy AForge.Math.dll to OpenSim bin folder or directory (only AForge.Math.dll).
    

Settings

• Please Edit bin/OpenSim.ini
  • Sample

    [Wind]
       ;# {enabled} {} {Enable wind module?} {true false} true
       ;; Enables the wind module.
       enabled = true
    
       ;# {wind_update_rate} {enabled:true} {Wind update rate in frames?} {} 150
       ;; How often should wind be updated, as a function of world frames.
       ;; Approximately 50 frames a second
       wind_update_rate = 100
    
       ;; The Default Wind Plugin to load
       ;wind_plugin = SimpleRandomWind
       wind_plugin = SimpleFluidSolverWind
       ..........
    [XEngine]
       ...........
       AllowOSFunctions = true

Support Script

SFSW_controller.lsl

• SFSW_controller.lsl
• When you touch it, object Says module parameters
   

Commands

/6000 force value

• Set a kind of the external force
• value
  • 0 : Random Wind (default)
  • 1 : North Wind
  • 2 : East Wind
  • 3 : South Wind
  • 4 : West Wind
  • 5 : Rotational Wind

/6000 period value

• Set period of the external force
• When this Wind module is called times of this value, Wind module restarts.
• If set 0, Wind module never restart by period.

/6000 strength value

• Set Wind strength
• Default is 1.0

/6000 damping value

• Set damping rate of the external force
• Default is 0.85

/6000 wind_visc value

• Set (scaled) viscosity coefficient of the wind
• Default is 0.001

/6000 wind_eps value

• Set lower limit of the energy variation rate.
• When the energy variation rate is under this value, Wind module restarts.
  • energy variation rate = (Previous Wind Energy - Current Wind Energy)/(Current Wind Energy)
• If set 0.0, Wind module never restart by energy variation rate.
• Default is 0.004

/6000 region value

• Set size of the region
• Normally, the region is automatically set

/6000 stop

• Stop the wind

/6000 reset

• Stop the wind and reset script

/6000 help

• Show the help messages
   

Memo