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      <title>Flattening lofted flanges</title>
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      <div class="title_topic3" id="xps10_pagetitle">Flattening lofted flanges</div>
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      <p class="para_topic">Only lofted flanges that consist of planes, partial cylinders, and partial cones can be flattened. Lofted flanges that contain ruled surfaces cannot. The type of geometry constructed depends upon how you draw the profiles. A lofted flange is constructed by mapping the faces between corresponding profile elements. The following are examples of how arcs and lines are lofted into varying shapes of <b class="uiTerm">Lofted Flange</b> sections.
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      <ul>
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            <p class="para_item">Two lines are lofted into a planar section.</p>
            <p class="para_item"><img align="bottom" src="graphics/lofted2.jpg" border="0"><img align="bottom" src="graphics/lofted3.jpg" border="0"></p>
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         <li>
            <p class="para_item">Two arcs of the same radius are lofted into a cylindrical bend region. </p>
            <p class="para_item"><img align="bottom" src="graphics/lofted4.jpg" border="0"><img align="bottom" src="graphics/lofted5.jpg" border="0"></p>
         </li>
         <li>
            <p class="para_item">Two arcs of differing radii are lofted into a conical bend region. </p>
            <p class="para_item"><img align="bottom" src="graphics/lofted0.jpg" border="0"><img align="bottom" src="graphics/lofted1.jpg" border="0"></p>
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         <li>
            <p class="para_item">A line can also loft into a point to create a triangular planar section. However, this can only happen in conjunction with other section curves. A simple set of sketches consisting of a line and a point won't create a <b class="uiTerm">Lofted Flange</b>. 
            </p>
            <p class="para_item"><img align="bottom" src="graphics/lofted6.jpg" border="0"><img align="bottom" src="graphics/lofted7.jpg" border="0"></p>
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         <li>
            <p class="para_item">An arc can also loft into a point to create a conical section. Once again, this can only happen in conjunction with other section curves.</p>
            <p class="para_item"><img align="bottom" src="graphics/lofted9.jpg" border="0"><img align="bottom" src="graphics/lofted8.jpg" border="0"></p>
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      <p class="para_topic">If the two profiles have the same number and type of elements, and each element on the first profile maps to the same element type on the second profile (line to line, or arc to arc), in most cases, you can flatten the lofted flange.</p>
      <p class="para_topic"></p>
      <div class="title_division">Ruled surface examples</div>
      <p class="para_division"> Any lofted flange that contains a ruled B-surface can't be flattened. A B-surface face is constructed when:</p>
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         <li>
            <p class="para_item">The start and end section lines have a different relative angle.</p>
         </li>
         <li>
            <p class="para_item">Two section arcs have different start angles, end angles, or total angles.</p>
         </li>
         <li>
            <p class="para_item">An arc is mapped to a line.</p>
         </li>
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