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>Blender Documentation Volume I - User Guide: Last modified April 29 2004 S68</TH
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>Tracking</H1
><P
> To make an object rotate so that it
faces another object, and keep this facing even if either object is moved,
select at least two objects and press <B
CLASS="keycap"
>CTRL-T</B
>.
A dialog appears asking if you want to use a Track <I
CLASS="emphasis"
>constraint</I
>
or the old (Pre-2.30) track system. The Track constraint will
be analyzed in <A
HREF="x6875.html"
>the Section called <I
>Constraints</I
> in the chapter called <I
>Character Animation</I
></A
> and is
the preferred method.
</P
><P
> Here we will briefly treat the old track system, so, let's assume you have
selected <TT
CLASS="literal"
>Old Track</TT
> in the dialog.
By default the inactive object(s) now track the active object
so that their local y axis points to the tracked object.
However, this may not happen if the tracking object already has a rotation
of its own. You can produce correct tracking
by canceling the rotation (<B
CLASS="keycap"
>ALT-R</B
>) of
the tracking object.
</P
><P
> The orientation of the tracking object is also set so that the
z axis is upward. To change this, select the tracking
object, change the Button Window to Object Context (<B
CLASS="guiicon"
> <IMG
SRC="PartAT/effects/gfx/AnimationButtonsIcon.png">
</B
>, or
<B
CLASS="keycap"
>F7</B
>) and select the track axis from the first row
of six radio buttons and the upward-pointing axis from the second in the
<TT
CLASS="literal"
>Anim Setting</TT
> panel.
(<A
HREF="x2290.html#BSG.EDT.F.S68.OB5"
>Figure 5</A
>).
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><P
><IMG
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></DIV
><P
><B
>Figure 5. Setting track axis.</B
></P
></DIV
><P
> To clear a track constraint, select the tracking object and
press <B
CLASS="keycap"
>ALT-T</B
>. As with clearing a parent constraint,
you must choose whether to lose or save the rotation imposed by
the tracking.
</P
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