In paraview the actor and mapper are combined into a representation. The standard representations are Outline, Points, WireFrame, SurfaceWithEdges, Glyph and Volume. You will have to pore over the wiki and plugins to find examples of how to make a new representation.<br>
<br>You might be able to get it to work with less effort by filling out a 4 RGBA color array, using A for opacity of course. ParaView is not particularly good at directly rendering color values without mapping through a lookup table however. You will have to turn off scalar mapping on the Display tab and you will also likely need to enable VTK's DepthSortPolyData filter as well.<br>
<br>good luck!<br><br clear="all">David E DeMarle<br>Kitware, Inc.<br>R&D Engineer<br>28 Corporate Drive<br>Clifton Park, NY 12065-8662<br>Phone: 518-371-3971 x109<br>
<br><br><div class="gmail_quote">On Wed, Nov 17, 2010 at 10:10 AM, Rafael Küng <span dir="ltr"><<a href="mailto:rafi.kueng@gmx.ch">rafi.kueng@gmx.ch</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
Hi there<br>
<br>
For my bachelor thesis, I'm doing a reader in c++ to read in large amount of points and display them (from a solar system simulation output in a sqlite db), but i fail at setting transparency for certain points. Can anybody please point me to a tutorial or give me a hint? I did look around and saw i probably need a mapper or actor, with a lookuptable, (at least in vtk only it works like this) but i didn't find an example how to convert this to paraview. (witch would be great, because i'm totally new to pv and vtk).<br>
How and where do i have to attach the mapper to?<br>
I did get the coloring working, but no clue how to continue from here.<br>
<br>
Many Thanks<br>
<br>
Rafael Kueng<br>
University of zurich<br>
<br>
Here's a draft of my code:<br>
<br>
int vtkSQLiteReader::RequestData(vtkInformation*,<br>
vtkInformationVector**,vtkInformationVector* outputVector)<br>
{<br>
<br>
vtkPolyData * out = vtkPolyData::GetData(outputVector);<br>
<br>
if (!this->dataIsRead)<br>
// only read if it's not been read before<br>
{<br>
readSnapshots(); //reads in the coordinates and velocities of particles<br>
readTracks(); //reads in the tracks of the particles<br>
<br>
this->dataIsRead = true;<br>
}<br>
<br>
out->SetPoints(this->Position);<br>
out->SetVerts(this->Cells);<br>
out->SetLines(this->Tracks);<br>
out->GetPointData()->AddArray(this->Velocity);<br>
<br>
// update the colors in every update<br>
generateColors();<br>
out->GetPointData()->SetScalars(this->colors);<br>
<br>
return 1;<br>
}<br>
<br>
<br>
int vtkSQLiteReader::generateColors()<br>
{<br>
this->colors = vtkSmartPointer<vtkUnsignedCharArray>::New();<br>
this->colors->SetName("Colors");<br>
this->colors->SetNumberOfComponents(3);<br>
this->colors->SetNumberOfTuples(this->nParticles);<br>
<br>
for (int i = 0; i<this->nParticles;i++)<br>
{<br>
// heres some code to choose the color per point..<br>
red = 255;<br>
green = 255;<br>
blue = 255;<br>
<br>
this->colors->InsertTuple3(i,<br>
red,<br>
green,<br>
blue);<br>
}<br>
return 1;<br>
}<br>
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</blockquote></div><br>