With this option you can display a stream line, or in fluid dynamics, a particle tracing, in a vector field. After choosing a vector result, using the default analysis and step selected, the program asks you for a point from which to start plotting the stream line. This point can be given in several ways:
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Clicking on the screen:
The point will be the intersection between the line orthogonal to the screen and the plane parallel to the screen and containing the center of rotation.
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Joining a node:
The selected node will be used as a start point.
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Selecting nodes:
Here several nodes can be selected to start with.
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Along a line:
With this option you can define a segment along which several start points will be chosen. The number of points will also be asked for, including the ends of the segment. In the case of just one start point, this will be the center of the segment.
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In a quad:
Here you can enter four lines that define a quadrilateral area which will be used to create a N x M matrix of points. These points will be the start for the stream lines. When giving N x M, N lies on the first and third line, and M on the second and fourth. So, points (0, 0..N), (M, 0..N), (0..M, 0) and (0..M, N) will lie on the lines. But in case of N=1 or M=1, this will be the center of the line, and if N = 1 and M = 1, this will be the center of the Quad.
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Intersect set:
The point will be the intersection between the line orthogonal to the screen and the current viewed sets nearest the viewpoint.
When viewing Stream Lines, labels can be drawn to show the times at the start and end points of the stream line.
Stream lines can also be deleted and their color changed (green by default).
The following options can be chosen for Stream Lines:
Color
: The colour of the stream lines.
Delete
: This option lets you select the stream lines to be deleted.
Label
: This option lets you select the kind of label:
- None: No labels are drawn.
- 0_End: Labels are drawn according to the following convention: 0 at the start of the stream line, and the total time taken for the particle to travel at the end.
- Ini_End: Labels are drawn according to the following convention: 0 at the chosen point, with - time
before at the beginning of the stream line and + time
after at the end.
Size & detail
: Here you can adjust the size, width and detail of the stream lines using the Stream line options window (see Point and Line options
).