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<TITLE> Description of Objects in VPython</TITLE>
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<H1 CLASS="Heading-1"> <font color="#0000A0">Composite Objects with frame</font></H1>
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<P CLASS="Normal">
You can group objects together to make a composite object that can be moved and rotated as though it were a single object. Create a frame object, and associate objects with that frame:</P>
<DIV>
<H2 CLASS="program0">
f = frame()</H2>
<P CLASS="program">
cylinder(frame=f, pos=(0,0,0), radius=0.1, length=1, color=color.cyan)</P>
<P CLASS="program">
sphere(frame=f, pos=(1,0,0), radius=0.2, color=color.red)</P>
<P CLASS="program">
f.axis = (0,1,0)</P>
<P CLASS="program">
f.pos = (-1,0,0)</P>
<P CLASS="Normal"> By default, frame() has a position of (0,0,0) and axis
in the x direction (1,0,0). The cylinder and sphere are created within the
frame. When any of the frame attributes are changed (<span class="attribute">pos</span>,
<span class="attribute">x</span>, <span class="attribute">y</span>, <span class="attribute">z</span>,
<span class="attribute">axis</span>, or <span class="attribute">up</span>),
the composite object is reoriented and repositioned.</P>
<P CLASS="Normal">Another frame attribute is <span class="attribute">objects</span>,
which is a list of objects contained in the frame. If you want to make all
the objects in a frame temporarily invisible, do the following (assume the
frame is named f):<br>
</P>
<div>
<h2 class="program0"> for obj in f.objects:<br>
obj.visible = 0</h2>
</div>
<P CLASS="Normal">You could use a similar method to set all the objects in
a frame to have the same color.</P>
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