If the grid spacing can is set to 'Auto' D3PLOT will calculate a
sensible value. If you want you can input a value manually.
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With the 2D graticule the space system used to display the model dimension
depends on the current view.
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Model space
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Is used if the view is orthogonal down one of the screen X, Y
or Z axes. The appropriate XY, YZ or XZ coordinates are shown,
and these move as the model moves (try dynamic translation and
you'll see).
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Screen space
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Is used if the view is not orthogonal. This just shows the current
window dimensions (X = 0 - 4095, Y = 0 - 3129). It is only useful
for setting up volume clipping using screen space orientation.
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If a
GRID
is added it draws a grid
on the screen at the current tick mark interval.
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