<div dir="ltr"><div class="markdown-here-wrapper" style="font-family:"Lucida Sans",Cantarell,Verdana,sans-serif;color:rgb(11,83,148)"><p style="margin:0px 0px 1.2em!important">Hi Sam,</p>
<p style="margin:0px 0px 1.2em!important">While you could use the vtkFollower approach, a better performing approach would be using the <a href="https://www.vtk.org/doc/nightly/html/classvtkPointGaussianMapper.html">vtkPointGaussianMapper</a>.<br>See the <a href="https://blog.kitware.com/paraview-5-introducing-the-point-gaussian-representation/">ParaView blog post</a> for examples.<br><strong>Note:</strong> You would have to write your own shader preset to render 2D squares. </p>
<p style="margin:0px 0px 1.2em!important">Hope that helps,<br>Sankhesh</p>
<div title="MDH:SGkgU2FtLDxkaXY+PGJyPjwvZGl2PjxkaXY+V2hpbGUgeW91IGNvdWxkIHVzZSB0aGUgdnRrRm9s
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IiBkYXRhLWdyLWlkPSIyMDciPlNhbmtoZXNoPC9nPjwvZGl2Pg==" style="height:0;width:0;max-height:0;max-width:0;overflow:hidden;font-size:0em;padding:0;margin:0">​</div></div></div><br><div class="gmail_quote"><div dir="ltr">On Sat, Apr 21, 2018 at 12:22 PM Sam Raby <<a href="mailto:rabysam28@gmail.com">rabysam28@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><p style="color:rgb(0,0,0);font-family:Calibri,Helvetica,sans-serif;font-size:16px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;margin-top:0px;margin-bottom:0px">Hello,</p><p style="color:rgb(0,0,0);font-family:Calibri,Helvetica,sans-serif;font-size:16px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;margin-top:0px;margin-bottom:0px"><br></p><p style="color:rgb(0,0,0);font-family:Calibri,Helvetica,sans-serif;font-size:16px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;margin-top:0px;margin-bottom:0px">I have an easy question, I think. </p><p style="color:rgb(0,0,0);font-family:Calibri,Helvetica,sans-serif;font-size:16px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;margin-top:0px;margin-bottom:0px"><br></p><p style="color:rgb(0,0,0);font-family:Calibri,Helvetica,sans-serif;font-size:16px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;margin-top:0px;margin-bottom:0px">I have hundreds of points in the 3D space. I need to visualize each of these points by a small 2D square, which I implemented. Therefore I have now hundreds of these small squares in the 3D space. However the issue is as follows:</p><p style="color:rgb(0,0,0);font-family:Calibri,Helvetica,sans-serif;font-size:16px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;margin-top:0px;margin-bottom:0px">When I rotate the scene, while all the<span> </span><span style="font-family:Calibri,Helvetica,sans-serif,EmojiFont,"Apple Color Emoji","Segoe UI Emoji",NotoColorEmoji,"Segoe UI Symbol","Android Emoji",EmojiSymbols;font-size:16px">squares </span>are naturally moving in respect to the camera, I want all of the squares keep their orientation towards the camera and still be constantly facing the camera.<span style="font-size:12pt"> I know if I use vtkFollower I could do this, but not sure how to do it for these MANY squares in the scene. My pipeline is as follows => All my points are stored in one single vtkPolydata and I have assigned a vtkSourcePlane to each of these points using </span><span style="font-size:12pt">vtkGlyph3D.</span></p><p style="color:rgb(0,0,0);font-family:Calibri,Helvetica,sans-serif;font-size:16px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;margin-top:0px;margin-bottom:0px"><span style="font-size:12pt"><br></span></p><p style="color:rgb(0,0,0);font-family:Calibri,Helvetica,sans-serif;font-size:16px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;margin-top:0px;margin-bottom:0px"><span style="font-size:12pt">Thanks for any feedback.</span></p><p style="color:rgb(0,0,0);font-family:Calibri,Helvetica,sans-serif;font-size:16px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;margin-top:0px;margin-bottom:0px"><span style="font-size:12pt"><br></span></p><p style="color:rgb(0,0,0);font-family:Calibri,Helvetica,sans-serif;font-size:16px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;margin-top:0px;margin-bottom:0px"><span style="font-size:12pt">-Sam</span></p><br></div>
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</blockquote></div>-- <br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div class="inbox-inbox-inbox-inbox-inbox-inbox-inbox-markdown-here-wrapper" style="font-family:"proza libre",sans-serif;color:rgb(0,56,107)"><h5 id="inbox-inbox-inbox-inbox-inbox-inbox-inbox-sankhesh-jhaveri" style="margin:1.3em 0px 1em;padding:0px;font-size:1.1em;border-bottom-width:1px;border-bottom-style:solid;border-bottom-color:rgb(238,238,238);font-weight:bold;color:rgb(11,65,148)">Sankhesh Jhaveri</h5>
<h6 id="inbox-inbox-inbox-inbox-inbox-inbox-inbox--sr-research-development-engineer-kitware-http-www-kitware-com-518-881-4417" style="margin:1.3em 0px 1em;padding:0px;font-size:1em;color:rgb(11,83,148);font-family:"open sans",sans-serif;font-weight:normal"><em>Sr. Research & Development Engineer</em> | <a href="http://www.kitware.com/">Kitware</a> | (518) 881-4417</h6>
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