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>Blender Documentation Volume I - User Guide: Last modified April 29 2004 S68</TH
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><H1
CLASS="section"
><A
NAME="mesh_modelling_objectmode_rotating"
></A
>Rotating objects</H1
><P
>
To rotate objects, activate Rotate mode by pressing
<B
CLASS="keycap"
>RKEY</B
>. As in Grab mode, you can change the
rotation by moving the mouse, confirm with <B
CLASS="keycap"
>LMB</B
>,
or <B
CLASS="keycap"
>ENTER</B
> cancel with <B
CLASS="keycap"
>RMB</B
>
or <B
CLASS="keycap"
>ESC</B
>.
</P
><P
>
Rotation in 3D space occurs around an axis, and there are various
ways to define this axis. Blender defines an axis by
direction and a point that it passes through. For example, by default, the
direction of the axis is orthogonal to your screen.
</P
><P
> If you are
viewing the scene from the front, side, or top, the
rotation axis will be parallel to one of the global coordinate
system axes. If you are viewing the scene from an angle, the rotation axis
is angled too, which can easily lead to a very odd rotation of your
object. In this case, you may want to keep the rotation axis
parallel to the coordinate system axes. Toggle this behaviour by
pressing <B
CLASS="keycap"
>MMB</B
> during Rotate mode and watch the
angle display in the window header.
</P
><P
> Alternatively, once you are in rotate mode, you can press
<B
CLASS="keycap"
>XKEY</B
>
<B
CLASS="keycap"
>YKEY</B
> or <B
CLASS="keycap"
>ZKEY</B
> to constrain rotation
along that axis of the <I
CLASS="emphasis"
>global reference</I
>.By
pressing <B
CLASS="keycap"
>XKEY</B
>-<B
CLASS="keycap"
>XKEY</B
> (<B
CLASS="keycap"
>XKEY</B
> twice) you constrain rotation
around the x axis of the Object <I
CLASS="emphasis"
>local reference</I
>.
The same is true for double <B
CLASS="keycap"
>YKEY</B
> and <B
CLASS="keycap"
>ZKEY</B
>.
As for Grab, a third keypress removes constraints.
</P
><P
> It is possible to have a numerical imput for rotation exactly as it
was for translations.
</P
><P
>
Select the point for the rotation axis to pass through
with the pertinent menu in the header of the 3D window, as discussed below.
(<A
HREF="x2137.html#BSG.EDT.F.MAK.OB1"
>Figure 1</A
>).
</P
><DIV
CLASS="figure"
><A
NAME="BSG.EDT.F.MAK.OB1"
></A
><DIV
CLASS="mediaobject"
><P
><IMG
SRC="PartM/objectmode/gfx/ObjectModeRotate.png"></P
></DIV
><P
><B
>Figure 1. The rotation point selection buttons</B
></P
></DIV
><P
></P
><UL
><LI
><P
>
<I
CLASS="emphasis"
>Bounding Box Center</I
> -
the axis passes through
the center of the selection's bounding box.
(If only one object is selected, the point used is the center
point of the object, which might not necessarily be in the geometric
center. In <A
HREF="x2137.html#BSG.EDT.F.MAK.OB1"
>Figure 1</A
> it is on the middle
of the rightmost edge, marked by a purple dot. For more on this point,
see <A
HREF="x2434.html"
>the Section called <I
>EditMode</I
> in the chapter called <I
>Mesh Modelling</I
></A
>.)
</P
></LI
><LI
><P
> <I
CLASS="emphasis"
>Median Point</I
> -
the axis passes through
the median point of the selection. This difference is only
relevant in EditMode, and the 'Median' point is the barycentrum
of all vertices.
</P
></LI
><LI
><P
> <I
CLASS="emphasis"
>3D Cursor</I
> -
the axis passes through the
3D cursor. The cursor can be placed anywhere you wish before rotating.
You can use this option to easily perform certain translations the
at the same time that you rotate an object.
</P
></LI
><LI
><P
> <I
CLASS="emphasis"
>Individual Object Centers</I
> -
each selected object
receives its own rotation axis, all mutually parallel and passing
through the center point of each object, respectively. If you
select only one object, you will get the same effect
as with the first button.
</P
></LI
></UL
><P
>
If you're just getting started with rotation, don't worry too much about
the foregoing details. Just play around with
Blender's tools and you'll get a feeling for how to work with them.
</P
><P
> Keeping <B
CLASS="keycap"
>CTRL</B
> pressed switches to snap mode.
In snap mode rotations are constrained to 5� steps. Keeping
<B
CLASS="keycap"
>SHIFT</B
>
pressed allows fine tuning here too. The rotation of selected objects can
be reset to the default value
by pressing <B
CLASS="keycap"
>ALT-R</B
>.
</P
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> </TD
><TD
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><P
>
You can also enter Rotate mode by drawing a
circular line while holding down <B
CLASS="keycap"
>LMB</B
>.
</P
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