VisIt Pseudocolor Isosurface

Isosurface Operator in VisIt
Isosurface Operator in VisIt

In VisIt, coloring an isosurface by a variable is an exercise in thinking in reverse. First, choose the variable that you want to color by, then choose the isosurface variable.

  1. In the Plot Manager section of the VisIt Main Window, select Plots->Pseudocolor and choose the scalar variable that you want to color the isosurface by.
  2. In the Plot Manager section, select Operators->Isosurface. This will add the Isosurface operator to the Pseudocolor Plot.
  3. In the Plot Manager section, select OpAtts->Isosurface. This will allow you to change the isosurface value. By default, VisIt chooses 10 levels that are linearly spaced between the minimum and maximum values.
  4. In the same window, change the Variable from default to the correct scalar value.
  5. Click on Apply.
  6. Click on the Draw button in the Plot Manager section.

Example

In this example, using the 5514roll.401.vtk database:

Pseudocolor Isosurface in VisIt
Pseudocolor Isosurface in VisIt

Pseudocolor Isosurface Example in VisIt
Pseudocolor Isosurface Example in VisIt

  1. In the Plot Manager section of the VisIt Main Window, select Plots->Pseudocolor and choose the Velocity Magnitude. This is the color that we will apply to the isosurface.
  2. In the Plot Manager section, select Operators->Isosurface. This will add the Isosurface operator to the Pseudocolor Plot.
  3. In the Plot Manager section, select OpAtts->Isosurface. We will change the Select By to Value(s) and input the value of 0.5 to get the surface of the water.
  4. In the same window, change the Variable from default to the correct scalar, in this case called Fraction.
  5. Click on Apply.
  6. Click on the Draw button in the Plot Manager section.

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