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Projection Objects

Projection Objects can be created within the ProblemModuleInit routine in problem.f90. To create projections you first need to add two USE statements to your problem.f90

  USE Projections
  USE Fields
  USE Cameras

Then in ProblemModuleInit declare a variable pointer of type ProjectionDef

  TYPE(ProjectionDef), POINTER :: Projection

Then create the Projection and set the various parameters as in the following example

    CALL CreateProjection(Projection)
    Projection%Field%id=CoolingStrength_Field
    Projection%Field%component=GASCOMP
    Projection%Field%name='Cooling_Strength'
    Projection%dim=3d0

• For more information on the Field sub-object's properties see ProcessingFields
• If you are making several projections, you can reuse the Projection Pointer (with or without Nullifying it) by calling CreateProjection(Projection) for each new projection.
• Also if you wish to use a particular camera viewpoint you can setup a camera object as follows:

     ALLOCATE(Projection%Camera)
     Projection%Camera%pos=(/4d0,-10d0,4d0/)
     Projection%Camera%UpVector=(/0d0,0d0,1d0/)
     Projection%Camera%Focus=(/4d0,4d0,4d0/)
     Projection%Camera%FOV=30d0
     Projection%Camera%Aspect=1d0
  

Here is a full list of the various Projection parameters with the default values

      INTEGER :: dim = 3                      ! projection axis
      REAL(KIND=qPREC) :: pow=1d0             ! power to multiply field by before summing
      INTEGER :: PlotLevel=MAXIMUMPLOTLEVEL   ! Sets resolution of output to that of PlotLevel.  
                                              ! (MAXIMUMPLOTLEVEL uses the current finest level of resolution)
      TYPE(CameraDef), POINTER :: Camera      ! Optional definition of a particular camera to use for the projection.  

At each process event (currently each frame) a bov/dat file pair will be generated in the out directory ie. out/cooling_strength_along_3_00014.bov and out/cooling_strength_along_3_00014.dat. The .bov file contains information about the data as well as the location of the actual data file .dat which contains the raw unformatted binary data. Visit will only recognize the .bov files. After opening the file, there will be a 2D dataset with a single variable projection that contains the integrated values.