<div dir="ltr">Be aware Glyph3D is a filter and will actually generate all those arrows in memory. Glyph3DMapper is a mapper and uses OpenGL tricks to render the same arrow lots of times.<div><br></div><div>Both classes place a glyph at the location of each input point. The orientation is controlled by a different array in your point data ala the comments below:</div><div><br></div><div>Thanks</div><div>Ken</div><div><br></div><div><div> //@{</div><div> /**</div><div> * Turn on/off orienting of input geometry.</div><div> * When turned on, the orientation array specified</div><div> * using SetOrientationArray() will be used.</div><div> */</div><div> vtkSetMacro(Orient, bool);</div><div> vtkGetMacro(Orient, bool);</div><div> vtkBooleanMacro(Orient, bool);</div><div> //@}</div><div><br></div><div> //@{</div><div> /**</div><div> * Orientation mode indicates if the OrientationArray provides the direction</div><div> * vector for the orientation or the rotations around each axes. Default is</div><div> * DIRECTION</div><div> */</div><div> vtkSetClampMacro(OrientationMode, int, DIRECTION, ROTATION);</div><div> vtkGetMacro(OrientationMode, int);</div><div> void SetOrientationModeToDirection()</div><div> { this->SetOrientationMode(vtkGlyph3DMapper::DIRECTION); }</div><div> void SetOrientationModeToRotation()</div><div> { this->SetOrientationMode(vtkGlyph3DMapper::ROTATION); }</div><div> const char* GetOrientationModeAsString();</div><div> //@}</div><div><br></div><div> enum OrientationModes</div><div> {</div><div> DIRECTION=0,</div><div> ROTATION=1</div><div> };</div></div><div><br></div><div><div><br></div><div> /**</div><div> * Tells the mapper to use an orientation array if Orient is true.</div><div> * An orientation array is a vtkDataArray with 3 components. The first</div><div> * component is the angle of rotation along the X axis. The second</div><div> * component is the angle of rotation along the Y axis. The third</div><div> * component is the angle of rotation along the Z axis. Orientation is</div><div> * specified in X,Y,Z order but the rotations are performed in Z,X an Y.</div><div> * This definition is compliant with SetOrientation method on vtkProp3D.</div><div> * By using vector or normal there is a degree of freedom or rotation</div><div> * left (underconstrained). With the orientation array, there is no degree of</div><div> * freedom left.</div><div> * This is convenience method. The same effect can be achieved by using</div><div> * SetInputArrayToProcess(vtkGlyph3DMapper::ORIENTATION, 0, 0,</div><div> * vtkDataObject::FIELD_ASSOCIATION_POINTS, orientationarrayname);</div><div> */</div><div> void SetOrientationArray(const char* orientationarrayname);</div></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Dec 2, 2016 at 10:18 AM, Andrea Gavana <span dir="ltr"><<a href="mailto:andrea.gavana@gmail.com" target="_blank">andrea.gavana@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Dear All,<div><br></div><div> I am trying to combine a vtkArrowSource and vtkGlyph3D. I have been (naively) thinking that by specifying a polydata with two points (start and end) and assigning its points to the vtkGlyph3D I would obtain an arrow that starts at the start point and end at the end point.</div><div><br></div><div>I have created a small, self-contained following Python script to demonstrate what I mean - I get 4 arrows, one at each point I define, instead of two arrows. What am I missing? Any suggestion is more than welcome.</div><div><br></div><div>Thank you in advance.</div><div><br></div><div>Andrea.</div><div><br></div><div><br></div><div><div><font face="monospace, monospace">import vtk</font></div><div><font face="monospace, monospace">import numpy</font></div><div><font face="monospace, monospace"><br></font></div><div><font face="monospace, monospace"># First set of points - first arrow</font></div><div><font face="monospace, monospace">points1 = numpy.array([[ 11271.915, 7538.686, 6245.661],</font></div><div><font face="monospace, monospace"> [ 11271.915, 7538.686, 5897.034]])</font></div><div><font face="monospace, monospace"><br></font></div><div><div><font face="monospace, monospace"># Second set of points - second arrow</font></div></div><div><font face="monospace, monospace">points2 = numpy.array([[ 10532.274, 9101.572, 6313.167],</font></div><div><font face="monospace, monospace"> [ 10532.274, 9101.572, 5964.539]])</font></div><div><font face="monospace, monospace"><br></font></div><div><font face="monospace, monospace"># Create an arrow source with some attributes</font></div><div><font face="monospace, monospace">arrow_source = vtk.vtkArrowSource()</font></div><div><font face="monospace, monospace">arrow_source.SetTipRadius(0.2)</font></div><div><font face="monospace, monospace">arrow_source.SetShaftRadius(0.<wbr>075)</font></div><div><font face="monospace, monospace"><br></font></div><div><font face="monospace, monospace"># Create the vtkGlyph3D</font></div><div><font face="monospace, monospace">arrow_glyph = vtk.vtkGlyph3D()</font></div><div><font face="monospace, monospace">arrow_glyph.<wbr>SetScaleModeToDataScalingOff()</font></div><div><font face="monospace, monospace"><br></font></div><div><font face="monospace, monospace"># Usual mapper</font></div><div><font face="monospace, monospace">arrow_mapper = vtk.vtkPolyDataMapper()</font></div><div><font face="monospace, monospace">arrow_mapper.<wbr>SetInputConnection(arrow_<wbr>glyph.GetOutputPort())</font></div><div><br></div><div><span style="font-family:monospace,monospace"># Usual actor</span></div><div><span style="font-family:monospace,monospace">arrow_actor = vtk.vtkActor()</span><br></div><div><font face="monospace, monospace">arrow_actor.SetMapper(arrow_<wbr>mapper)</font></div><div><font face="monospace, monospace"><br></font></div><div><font face="monospace, monospace">append_poly_data = vtk.vtkAppendPolyData()</font></div><div><br></div><div><font face="monospace, monospace"># Loop through points1 and points2</font></div><div><font face="monospace, monospace">for p in [points1, points2]:</font></div><div><br></div><div><font face="monospace, monospace"> arrow_poly_data = vtk.vtkPolyData()</font></div><div><font face="monospace, monospace"> vtk_arrow_lines = vtk.vtkCellArray()</font></div><div><font face="monospace, monospace"><br></font></div><div><font face="monospace, monospace"> vtk_arrow_lines.<wbr>InsertNextCell(2)</font></div><div><font face="monospace, monospace"> vtk_arrow_lines.<wbr>InsertCellPoint(0)</font></div><div><font face="monospace, monospace"> vtk_arrow_lines.<wbr>InsertCellPoint(1)</font></div><div><font face="monospace, monospace"><br></font></div><div><font face="monospace, monospace"> vtk_arrow_points = vtk.vtkPoints()</font></div><div><font face="monospace, monospace"> # Loop through the head and tail of a single arrow</font></div><div><font face="monospace, monospace"> for j in xrange(2):</font></div><div><font face="monospace, monospace"> vtk_arrow_points.<wbr>InsertNextPoint(p[j])</font></div><div><font face="monospace, monospace"><br></font></div><div><font face="monospace, monospace"> arrow_poly_data.SetPoints(vtk_<wbr>arrow_points)</font></div><div><font face="monospace, monospace"> arrow_poly_data.SetLines(vtk_<wbr>arrow_lines)</font></div><div><font face="monospace, monospace"> append_poly_data.AddInputData(<wbr>arrow_poly_data)</font></div><div><font face="monospace, monospace"><br></font></div><div><font face="monospace, monospace"><br></font></div><div><font face="monospace, monospace">arrow_glyph.<wbr>SetInputConnection(append_<wbr>poly_data.GetOutputPort())</font></div><div><font face="monospace, monospace">arrow_glyph.<wbr>SetSourceConnection(arrow_<wbr>source.GetOutputPort())</font></div><div><font face="monospace, monospace">arrow_glyph.SetScaleFactor(<wbr>100)</font></div><div><font face="monospace, monospace">arrow_actor.GetProperty().<wbr>SetColor(1, 1, 1)</font></div><div><font face="monospace, monospace"><br></font></div><div><font face="monospace, monospace"># ------------------------------<wbr>------------------------------</font></div><div><font face="monospace, monospace"># Create the RenderWindow, Renderer and both Actors</font></div><div><font face="monospace, monospace"># ------------------------------<wbr>------------------------------</font></div><div><font face="monospace, monospace">ren = vtk.vtkRenderer()</font></div><div><font face="monospace, monospace">renWin = vtk.vtkRenderWindow()</font></div><div><font face="monospace, monospace">renWin.AddRenderer(ren)</font></div><div><font face="monospace, monospace">iren = vtk.vtkRenderWindowInteractor(<wbr>)</font></div><div><font face="monospace, monospace">iren.SetRenderWindow(renWin)</font></div><div><font face="monospace, monospace"><br></font></div><div><font face="monospace, monospace"># add actors</font></div><div><font face="monospace, monospace">ren.AddActor(arrow_actor)</font></div><div><font face="monospace, monospace">ren.ResetCamera()</font></div><div><font face="monospace, monospace">iren.Start()</font></div><div><font face="monospace, monospace"><br></font></div><font face="monospace, monospace"><br></font></div></div>
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