Text orientation in space or towards observer
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Billboarding = TRUE, text objects are
always facing the observer. With
Billboarding = FALSE,
text objects retain their orientation relative to other objects.
Often, text objects in 3D are used to label certain places in
a graphic (note that objects can contain a title,
so text objects are usually only necessary for additional descriptions).
In this case, it is desirable that they always face the observer to
be readable and not rotate along with the rest of the scene. This
is the default behavior. To get text objects that are actually part
of the scene in the sense that rotating the scene also rotates the
Billboarding = FALSE.
In the following image, the prime numbers use
= TRUE, while other numbers do not:
plot(plot::Text3d(expr2text(i), [3*i, 0, 0], TextOrientation = [1, 0, 0, 0, 1, 0], Billboarding = isprime(i)) $ i = 1..15, TextFont = , Scaling = Constrained, Axes = None)
Note that text objects with
Billboarding = TRUE ignore