Schlieren
Schlieren (Line Integral Convolution (LIC)) is another possibility to visualize the fluid flow field provided in FlowDict, AddiDict and FilterDict. LICs are visually displayed as distorted striations or streaks in 2D sections that represent fluid motion through the 3D flow field, in any of the three directions.
The Schlieren tab controls the visibility of the schlieren. Some additional options and all the options from the View Controls can also be found in the Visualization Settings dialog. Expand the Visualization Settings dialog either by clicking the gear wheel icon in the bottom right of the Schlieren tab or by opening the Visualization tab in the sidebar and unfolding the Data View → Schlieren section.
Flow
The Flow pull-down menu shows one choice for each loaded vector field. For a flow field for example, only the field Velocity is available. The Schlieren are computed from the selected field.
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Direction
Direction defines the location of the schlieren 2D section in the three directions.
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Position
The Position of the 2D schlieren section can be changed either by moving the slider below Direction in the Schlieren tab or by entering different values in the Visualization Settings dialog (Data View - Schlieren - Position)
For example, to examine the schlieren along the Z-direction, change the Position value as indicated:
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Length
Length defines the elongation of the individual LIC lines.
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Resolution
Resolution specifies the number of pixels in one spatial direction that represent the related voxel.
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Type
Type allows predefined post-processing of the schlieren by choosing from the pull-down menu. Type 0 displays the original LIC and Type 1 to Type 4 each applies a different sharpening filter to the original LIC.
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Normalize
Checking Normalize activates the normalization of the visualization in relation to the maximum fluid velocity.
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Colorize and Color Field
Colorize defines whether the schlieren are displayed in gray scales or in color. The color then can be selected from the flow fields, available in the pull-down menu for Color Field (Visualization Settings dialog: Data View - Schlieren - Color Field).
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Clipping
Clipping works similar as for the structure and the other fields, but only two directions are available for clipping, depending on the chosen direction.
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