How to Use VRML

The three-dimensional visualization is indispensable in order to understand three-dimensional simulation results such as the earth's magnetosphere better. By the appearance of the VRML (Virtual Reality Modeling Language) which is the international and standard language for the internet's three-dimensional visualization, it would be possible to watch the three-dimensional image as VRML file by the VRML viewer, even if people does not have three-dimensional image processing machinery and three-dimensional image processing software. It is shown the method of how to make VRML file by fortran and example and interface subroutine package of making for the VRML contents preparation.

1. Fundamental example (1)
In this chapter, the fundamental example which makes the image file of the VRML2.0 type using the 
Fortran program is shown. Concretely, the image file of the VRML2.0 type is made by compiling,
linking and executing each main program and subroutine package.

Usage:
1. f77 -c -O pk1subrtn.f
      The object module (pk1subrtn.o) is made by the compilation of subroutine package (pk1subrtn.f).
2. f77 -O box1.f pk1subrtn.o
      The execution file (a.out) is made by the link of the main program (box1.f etc.) with the object 
      module (pk1subrtn.o).
3. a.out
      The VRML 2.0 (fort.10) file is made by the execution of the execution file (a.out).
4. mv fort.10 box1.wrl
      The file name of made VRML is changed at "***.wrl". 

2. Fundamental example (2)
In this chapter, the example that it is fundamental for making the image file of the VRML 2.0 type 
using the Fortran program and can utilize as it is for analysis application of simulation data is 
shown. Concretely, the image file of the VRML2.0 type is made by compiling, linking and executing 
each main program and subroutine package (zvrsuba.f). 

The usage:
1. f77 -c -O zvrsuba.f
      The object module (zvrsuba.f) is made by the compilation of subroutine package (zvrsuba.o).
2. f77 -O msymbol.f zvrsuba.o
      The execution file (a.out) is made by the link of the main program (msymbol.f etc.) with the object
      module (zvrsuba.o).
3. a.out
      The VRML 2.0 (fort.10) file is made by the execution of the execution file (a.out).
4. mv fort.10 box1.wrl
      The file name of made VRML is changed at "***.wrl".

3. Application to the MHD simulation
In this chapter, the concrete application which makes the VRML file by using the asymmetrical 
three-dimensional magnetosphere data of the three-dimensional global MHD simulation of interaction 
between the solar wind and the earth's magnetosphere with dawn-dusk asymmetry, is shown.

The usage:
1. f77 -c -O zvrsuba.f
      The object module (zvrsuba.f) is made by the compilation of subroutine package (zvrsuba.o).
2. f77 -O zvrcroa.f zvrsuba.o
      The execution file (a.out) is made by the link of the main program (zvrcroa.f or zvrmaga.f) with the 
      object module (zvrsuba.o).
3. a.out
      The VRML 2.0 (fort.10) file is made by the execution of the execution file (a.out).
4. mv fort.10 box1.wrl
      The file name of made VRML is changed at "***.wrl".
5. cat zvrcroa.wrl zvrmaga.wrl > zvr1.wrl
      The file of two VRML is synthesized.

4.3-Dimensional MHD Simulation of Earth's Magnetosphere

(Example to execute the MHD Code and Graphic programs)

5.Visualization to Various 3-dimensional MHD Models of Earth's Magnetosphere

5-a. Half volume model of earth's magnetosphere with IMF By and Bz components

5-b. Quarter volume model of earth's magnetosphere

5-c. Half volume model of earth's magnetosphere with dipole tilt

5-d. Whole volume model of earth's magnetosphere