glowscript / docs / GlowScriptDocs / helix.html

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            <td width="77%"><div align="center"><span class="style1 style2"><font color="#0000A0">helix</font></span></div></td>
            <td width="23%"><div align="center"><img src="images/helix.jpg" alt="helix" width="131" height="127" /><a href="arrow.html"></a></div></td>
        <p class="Normal">The following statement will display a helix that is
        parallel to the x axis (the default axis direction), with length 5 and diameter 1:</p>
          <p class="program">var spring = helix( {pos:vec(0,2,1), <br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;      size:vec(5,1,1)} )</p>
          <p class="Normal">The attribute <span class="attribute">thickness</span> is the diameter of the cross section of the curve used to draw the helix; default is diameter/10.     </p>
          <p class="Normal"> Here is the rest of the attributes for a helix. All 3D objects have all of these attributes, other than arrow and curve:</p>
          <p class="attributes"> <font color="#FF0000" class="attribute">pos</font> Position: the center of one end of the helix; default = vec(0,0,0).</p>
          <p class="attributes"> <span class="attribute">size</span> The length, width, and height of the helix; default = vec(1,1,1). Changing the size does not change the thickness.</p>
          <p class="attributes"> <font color="#FF0000">axis</font> The axis points in the direction of the length of the helix, default = vec(1,0,0). Only the direction of the axis is meaningful, not its magnitude. The length of the helix is size.x, not the magnitude of the axis. </p>
          <p class="attributes"> <span class="attribute">color</span> Color of object, 
            as a red-green-blue (RGB) triple: vec(1,0,0) is the same as, default = vec(1,1,1), 
            which is color.white.</p>
          <p class="attributes"><span class="attribute">up</span> Which side
            of the  helix is &quot;up&quot;; default = vec(0,1,0).</p>
          <p class="attributes"><span class="attribute">visible</span> If false, 
            object is not displayed; e.g. <span class="attribute">spring.visible = false</span><em class="program"><br />
              </em> Use <span class="attribute">spring.visible = true</span> to make the object 
            visible again.</p>
          <p class="Normal"> <strong>End vs center:</strong> The <span class="attribute">pos</span> attribute 
            for arrow, cone, cylinder, helix, and pyramid corresponds to one end of the object, 
            whereas for a box, ring, or sphere it corresponds to the center of the object. </p>
          <p class="Normal"><strong>No texture or opacity:</strong> Currently helixes cannot be transparent, it is not possible to apply a texture, and it cannot be part of a compound object.</p>
          <p class="Normal">To display a trail or an arrow along the path of a moving object, see <a href="trail.html"><strong>Attach a trail or arrow</strong></a>.</p>
      <p class="Normal">See <a href="rotation.html"><strong>Rotating an Object</strong></a> for an easy way to change the direction of an object.</p>
          <p class="Normal">When you start a  program, for convenience GlowScript 
            creates a <a href="display.html">canvas</a> on the web page and names it <span class="attribute">scene</span>. 
          Objects that you create are drawn on this canvas. If you have more than one canvas, you can specify  in which canvas to place a new object, as in box( {canvas:myscene} ).</p>
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