<div style="line-height:1.7;color:#000000;font-size:14px;font-family:arial">Dear Kenneth,<div>Thanks a lot for your reply. I think I didn't describe the question clearly. </div><div>a) The curve isn't planar. It isn't close to planar neither. It is a loop, an output of vtkSplineFilter.</div><div>b) The surface isn't close to planar near the curve.</div><div>c) I didn't get you quite well about this point. I mean I want the result just looks like you draw the curve on the surface, that means after projecting the result curve is totally <i>lying </i>on the surface. It needn't be accurate, just looks smooth.</div><div><br></div><div>Regards,</div><div>Yue<br> <br><br><br><br><div></div><div id="divNeteaseMailCard"></div><br>At 2013-11-28 14:39:54,"Kenneth Sloan-3 [via VTK]" <<a href="/user/SendEmail.jtp?type=node&node=5724694&i=0" target="_top" rel="nofollow" link="external">[hidden email]</a>> wrote:<br> <blockquote style='border-left:2px solid #CCCCCC;padding:0 1em' id="isReplyContent" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
A lot depends on the nature of the curve and the surface.
<br><br>a) is the curve (close to) planar?
<br>b) is the surface close to planar near the curve?
<br>c) do you want the curve literally "projected" onto the surface, or do want
<br> the curve somehow "draped" over the surface?
<br><br>Easiest is probably the case where the surface is large and locally "flat" near the curve, and the curve
<br>itself is relatively flat. Select a compromise plane (or, from another point of view, a compromise vector from the curve in the direction of the surface). Sample the curve, and cast rays from curve sample points in the direction of the surface. Find points of intersection and connect the dots.
<br><br>If both the surface and the curve are convoluted, then the problem becomes much harder, and the answer less well defined.
<br><br>Good luck!
<br>--
<br>Kenneth Sloan
<br><a href="/user/SendEmail.jtp?type=node&node=5724691&i=0" target="_top" rel="nofollow" link="external">[hidden email]</a>
<br><br><br>On Nov 28, 2013, at 05:49 , Green Hedgehog <<a href="/user/SendEmail.jtp?type=node&node=5724691&i=1" target="_top" rel="nofollow" link="external">[hidden email]</a>> wrote:
<br><div class="shrinkable-quote"><div class='shrinkable-quote'><br>> Dear all,
<br>>
<br>> There is a closed surface with a curve near it. I want to project the curve
<br>> onto the surface and then render . Does anyone have any suggestions?
<br>>
<br>> Yue
<br>>
<br>>
<br>>
<br>> --
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