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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<title>points</title>
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<p class="Normal"><a href="primitives.html">Pictures</a> of 3D objects</p>
<p class="Normal">Choose a 3D object:</p>
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<td width="77%"><div align="center"><span class="style1 style2"><font color="#0000A0">points</font></span></div></td>
<td width="23%"><div align="center"><img src="images/points.jpg" alt="points" width="131" height="127" /><a href="arrow.html"></a></div></td>
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<div>
<p class="Normal">The points object takes a list of points for <span
class="attribute">pos</span>, like the curve object. The following statement
will display two points, each of radius 50 pixels:</p>
<div>
<p class="program">points(pos=[(-1,0,0), (1,0,0)], size=50, color=color.red)</p>
<p class="Normal">The points object is similar to a curve, but with
disconnected points. As with curve, the pos attribute is an array
of points, and color can also be an array. If you say <span class="attribute">shape="round"</span>,
the points are round, which is the default; <span class="attribute">shape="square"</span> makes
square points. The size of the points is specified by <span class="attribute">size</span>
and the default size is 5 (meaning a square 5 by 5, or a circular
disk bounded by a 5 by 5 square). The size attribute is in screen
pixels if <span class="attribute">size_units="pixels"</span> (the
default), but if <span class="attribute">size_units="world"</span>,
the size is in the usual coordinates. The maximum size of a point
is about 50 by 50 pixels; specifying a larger size than the maximum
does not increase the size. </p>
<p class="Normal">Lighting does not affect the appearance,
which is determined solely by the color. You cannot specify a material
for points, and currently it is not possible to specify the opacity
of a points object.</p>
<p class="Normal">See description of <a href="options.html">Additional
Attributes</a> available for all 3D display objects.</p>
<p class="Normal"><span class="Normal"><em>Technical
caveat:</em> size_units="world" may not work on very old video drivers which do not support OpenGL
1.4 or the ARB_POINT_PARAMETERS extension. If you have problems,
upgrade your video driver.</span></p>
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