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<p class="MsoNormal">Hi, <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am using multiple vtkTriangleStrips to render tubes with differing cross-section at each end, e.g. an ellipse at one end and a square at the other end. I am overlaying each of the tube's ends with a vtkPolyLine of contrasting colour to
allow the user to view just the end cross-sections and hide the triangulated tube surface. I am creating a repeating timer on the interactor to animate the scene.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have a separate vtkActor for each of the polylines and the triangle strip. Each of the ends of a tube can be translated and oriented differently when the animation is running.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The issue I have is that I can't find a way of specifying multiple vtkPoints arrays (i.e. one for each polyline) as input to the triangle strip, so I am creating a new vtkPoints array for the triangle strip's vtkPolyData and populating
it with the vtkPoints arrays for each polyline in turn. This is repeated at each step in the animation, causing a significant performance hotspot when the number of tubes is scaled up:
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">// Update triangle strip to reflect transformed polylines <o:p>
</o:p></p>
<p class="MsoNormal">// Get points for each end <o:p></o:p></p>
<p class="MsoNormal">vtkPoints points = polylineEnd1Actor().GetMapper().GetInput().GetCell(0).GetPoints();
<o:p></o:p></p>
<p class="MsoNormal">vtkPoints pointsEnd2 = polylineEnd2Actor().GetMapper().GetInput().GetCell(0).GetPoints();
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">// Create a new vtkPoints for triangle strip <o:p></o:p></p>
<p class="MsoNormal">int pointCountEnd2 = pointsEnd2.GetNumberOfPoints(); <o:p></o:p></p>
<p class="MsoNormal">for (int i = 0; i < pointCountEnd2; ++i) <o:p></o:p></p>
<p class="MsoNormal">{ <o:p></o:p></p>
<p class="MsoNormal"> // Append transformed pointsEnd2 to points for triangle strip poly data<o:p></o:p></p>
<p class="MsoNormal"> points.InsertNextPoint(pointsEnd2.GetPoint(i)[0], pointsEnd2.GetPoint(i)[1], pointsEnd2.GetPoint(i)[2]);
<o:p></o:p></p>
<p class="MsoNormal">} <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">PolyDataForTriangleStrip.SetPoints(points); <o:p></o:p></p>
<p class="MsoNormal">PolyDataForTriangleStrip.Modified(); <o:p></o:p></p>
<p class="MsoNormal">PolyDataNormalsForTriangleStrip.SetInputData(PolyDataForTriangleStrip);
<o:p></o:p></p>
<p class="MsoNormal">PolyDataNormalsForTriangleStrip.Update(); <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I would like to find a way of mapping polydata/points of the two polylines directly to the triangle strip's polydata/points, such that when the polyline actors are transformed, their new point coordinates are reflected in the triangle strip
without having to create a new vtkPoints.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am using ActiViz.Net with C#.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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