Visual

Rasterization

The solver, in DIRECT mode, has the capability to record the evolution of simulation variables and export them as videos (.mp4 format). For this, FFMPEG is used. To enable this, make sure you have ffmpeg installed on your system. Then, in settings file, specify:

  rendering:
    renderer : DIRECT

To tell the solver to use ffmpeg.

In the configuration file one can define:

fields_to_rasterize:
  field1:
    id: 1
    min: 0.009
    max: 0.0
    autoset: false
    output: output_density.mp4
  field2:
    id: 2
    min: 1.5
    max: 0.02
    autoset: true
    output: output_density1.mp4
  field4:
    id: 2
    min: 3
    max: 0.02
    autoset: true
    output: output_mach.mp4
  field3:
    id: 5
    min: 0
    max: 1
    autoset: true
    output: output_temp.mp4

Field ID's tell the solver which field you want to rasterize. These are:

Field IDs

id	Field
0	Density gradient
1	Density
2	Pressure
3	Temperature
4	Mach number
5	u (x-velocity)
6	v (y-velocity)

The rest of the specification tells how the solver should rasterize these fields:

Field	Description
min	Minimum value for the color scale
max	Maximum value for the color scale
autoset	If true, automatically determines min/max instead of using the specified values
output	Output filename for the rendered video