ViewVertical

is an option for Graphics3D and related functions which specifies what direction in scaled coordinates should be vertical in the final image.

Details

The default setting is ViewVertical->{0,0,1}, which specifies that the axis in your original coordinate system should end up vertical in the final image.
The setting for ViewVertical is given in scaled coordinates, which run from 0 to 1 across each dimension of the bounding box.
Only the direction of the vector specified by ViewVertical is important; its magnitude is irrelevant.
Changing ViewVertical has the effect of tipping a simulated camera.
Explicit settings for ViewMatrix override settings for ViewVertical.

Examples

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By default, the direction of the axis is the vertical direction in the final image:

Use the direction of the axis as the vertical direction in the final image:

Various view vertical directions:

Orient a 3D rendering of a 2D cellular-automaton evolution:

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