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<p class="MsoNormal">Hi all,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> I’m trying to use the vtkplane::IntersectWithLine() method and it seems to be giving me some issues (which, most likely is on my part). I have a cube that I’m sending a line through. I need to find the plane where the
line enters and the one where the line exits. The way that I do this is to create 6 vtkplanes using (coordinates defined appropriately for each plane):<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New"">
<span style="color:#010001">pPoint1</span>[0] = 0; <span style="color:#010001">
pPoint1</span>[1] = 0; <span style="color:#010001">pPoint1</span>[2] = 0;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New"">
<span style="color:#010001">pPoint2</span>[0] = 0; <span style="color:#010001">
pPoint2</span>[1] = <span style="color:#010001">dfYRange</span>; <span style="color:#010001">
pPoint2</span>[2] = 0;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New"">
<span style="color:#010001">pPoint3</span>[0] = <span style="color:#010001">dfXRange</span>;
<span style="color:#010001">pPoint3</span>[1] = 0; <span style="color:#010001">
pPoint3</span>[2] = 0;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New"">
<span style="color:#010001">vtkSmartPointer</span><<span style="color:#010001">vtkPlane</span>>
<span style="color:#010001">pPlane1</span> = <span style="color:#010001">vtkSmartPointer</span><<span style="color:#010001">vtkPlane</span>>::<span style="color:#010001">New</span>();<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New"">
<span style="color:#010001">pPlane1</span>-><span style="color:#010001">SetOrigin</span>(<span style="color:#010001">pPoint1</span>);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New"">
<span style="color:#010001">vtkTriangle</span>::<span style="color:#010001">ComputeNormal</span>(<span style="color:#010001">pPoint1</span>,
<span style="color:#010001">pPoint2</span>, <span style="color:#010001">pPoint3</span>,
<span style="color:#010001">normals</span>);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New"">
<span style="color:#010001">pPlane1</span>-><span style="color:#010001">SetNormal</span>(<span style="color:#010001">normals</span>);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New"">When I call,
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-indent:.5in;text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New";color:blue">int</span><span style="font-size:10.0pt;font-family:"Courier New"">
<span style="color:#010001">icheck</span> = <span style="color:#010001">pIntersectionPlane</span>-><span style="color:#010001">IntersectWithLine</span>(<span style="color:#010001">pLineStart</span>,
<span style="color:#010001">pLineEnd</span>, <span style="color:#010001">lineCoordinate</span>,
<span style="color:#010001">pIntersectionPoint</span>);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:.5in;text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New"">the value of icheck is > 0 for 4 of the 6 planes. I don’t get it. From the documentation, seems that it should be > 0 for any plane that it intersects.
So, I would always assume that it would intersect with only 2 of the 6 planes. <o:p>
</o:p></span></p>
<p class="MsoNormal" style="text-indent:.5in;text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New"">Any idea what’s going on?<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:.5in;text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New"">Doug<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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