<div dir="ltr"><div>Chiang,</div><div><br></div>You can't clip an object with two planes and get a convex object as shown in the attachment. Instead, try clipping with a vtkBox:<div><br></div><div><a href="http://www.vtk.org/doc/nightly/html/classvtkBox.html">http://www.vtk.org/doc/nightly/html/classvtkBox.html</a><br><div><br></div><div>- Cory</div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Jan 5, 2016 at 2:40 PM, WangQ <span dir="ltr"><<a href="mailto:wangq1979@outlook.com" target="_blank">wangq1979@outlook.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><div dir="ltr">Dear Cory,<div><br></div><div>I try to use 2 perpendicular planes to clip a volume to achieve something shown in the attachment, i.e. clipping 1/4 of a volume. But the result <span style="font-size:12pt">unfortunately</span><span style="font-size:12pt"> </span><span style="font-size:12pt"> is reverse, i.e. clipping 3/4 away, and showing the rest 1/4. Do you have any suggestion?</span></div><div><span style="font-size:12pt"><br></span></div><div><span style="font-size:12pt">Many thanks!</span></div><div><span style="font-size:12pt"><br></span></div><div>Chiang</div><div><br><div><span class=""><hr>Date: Tue, 5 Jan 2016 10:28:33 -0500<br>Subject: Re: [vtkusers] Transform a clipping plane<br>From: <a href="mailto:cory.quammen@kitware.com" target="_blank">cory.quammen@kitware.com</a><br>To: <a href="mailto:wangq1979@outlook.com" target="_blank">wangq1979@outlook.com</a><br>CC: <a href="mailto:vtkusers@vtk.org" target="_blank">vtkusers@vtk.org</a><br><br></span><div><div class="h5"><div dir="ltr">Chiang,<div><br></div><div>The transform is applied to points at which the plane function is evaluated, but it is not considered when setting up clipping planes in the mapper.</div><div><br></div><div>You should be able to get the same effect from your rotations by applying the transform to a point representing the tip of the plane normal.</div><div><br></div><div>double normal[] = {0, 1, 0};</div><div>double rotatedNormal[3];</div><div>transPlane->TransformPoint(normal, rotatedNormal);</div><div>plane->SetNormal(rotatedNormal);</div><div><br></div><div>HTH,</div><div>Cory</div><div><br></div></div><div><br><div>On Tue, Jan 5, 2016 at 7:32 AM, WangQ <span dir="ltr"><<a href="mailto:wangq1979@outlook.com" target="_blank">wangq1979@outlook.com</a>></span> wrote:<br><blockquote style="border-left:1px #ccc solid;padding-left:1ex">
<div><div dir="ltr">Hello vtkusers,<div><br></div><div>I used vtkplane to clip a volume. Everything is find until the volume is transformed. The plane is still at the original position. I then applied vtkTransform to the plane, but the plane is still the same place. The code snippet is as below:</div><div><br></div><div><div> vtkSmartPointer<vtkPlane> plane =</div><div> vtkSmartPointer<vtkPlane>::New();</div><div> plane->SetOrigin(0, tomo2DDims / 2, 0);</div><div> plane->SetNormal(0, 1, 0);</div><div> vtkSmartPointer<vtkTransform> transPlane = vtkSmartPointer<vtkTransform>::New();</div><div> transPlane->RotateY(90);</div><div> transPlane->RotateZ(90);</div><div> transPlane->RotateX(55);</div><div> transPlane->RotateY(3);</div><div> plane->SetTransform(transPlane);</div><div><br></div><div> cutVolumeMapper->AddClippingPlane(plane);</div></div><div><br></div><div><br></div><div>Appreciate your help in advance!</div><div><br></div><div>cheers,</div><div><br></div><div>Chiang</div> </div></div>
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