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<TITLE> Description of Objects in VPython</TITLE>
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<H1 CLASS="Heading-1"> <font color="#0000A0">The ring Object</font></H1>
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<P CLASS="Normal"> <IMG SRC="VisualRef-5.gif" ALIGN="RIGHT"> The ring object
is circular, with a specified outer radius and thickness, and with its center
given by the <span class="attribute">pos</span> attribute:</P>
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<H2 CLASS="program0">
ring(pos=(1,1,1), axis=(0,1,0), radius=0.5, thickness=0.1)</H2>
<P CLASS="Normal"> The ring object has the following attributes and default
values, like those for cylinders: <span class="attribute">pos<font color="#000000">
(0,0,0)</font></span>, <span class="attribute">x</span><span class="attribute"><font color="#000000">
(0)</font></span>, <span class="attribute">y<font color="#000000">(0)</font></span>,
<span class="attribute">z<font color="#000000">(0)</font></span>, <span class="attribute">axis<font color="#000000">
(1,0,0)</font></span>, <span class="attribute">length<font color="#000000">
(1)</font></span>, <span class="attribute">color<font color="#000000"> (1,1,1)
which is color.white</font></span>, <span class="attribute">red<font color="#000000">
(1)</font></span>, <span class="attribute">green<font color="#000000"> (1)</font></span>,
<span class="attribute">blue<font color="#000000"> (1)</font></span>, and
<span class="attribute">up<font color="#000000"> (0,1,0)</font></span>.
As with cylinders, <span class="attribute">up</span> has a subtle effect
on the 3D appearance of a ring. The <span class="attribute">axis</span>
attribute only affects the orientation of the ring; the magnitude of the
<span class="attribute">axis</span> attribute is irrelevant. Additional
ring attributes:</P>
<P CLASS="attributes"> <span class="attribute">radius</span> Outer radius
of the ring, default = 1</P>
<P CLASS="attributes"> <span class="attribute">thickness</span> Thickness of ring
(1/10th of radius if not specified)</P>
<P CLASS="Normal"> Note that the <span class="attribute">pos</span> attribute
for cylinder, arrow, cone, and pyramid corresponds to one end of the object,
whereas for a ring, sphere, and box it corresponds to the center of the
object.</P>
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<H1 CLASS="Heading-1"> </H1>
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