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F4.4} Viewports
Viewports
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There are 4 viewports named: "Red", "Green", "Blue" and "Magenta",
identified by the color on the maximize button, on the top right corner.
The cross section of each viewport is represented on the other
viewports with a dash line (viewport-line). The projection of the
center is represented with a small square. See section F4.5 for
navigating in the viewports
Axes System
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Each viewport is identified by its:
1. origin center of the viewport
2. basis relative axes system u, v, w.
w is coming out of the screen towards the user
3. extends zoom
Note:
- The user is looking the negative -w of each viewport
- If bodies A, B are touching the viewport like on the plot.
Only the body B will be visible to the viewer
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