[vtkusers] volume rendering of unstructured points

[Lubos Brieda]

Heh,

I was able to figure it out in the meant time. All that was needed is to use 
SetOpacity under the actors Property. Results look really neat!

VTK_CREATE(vtkUnstructuredGridReader,reader);
reader->SetFileName("part_ele.vtk");

VTK_CREATE(vtkVertexGlyphFilter, filter);
filter->SetInputConnection(reader->GetOutputPort());
filter->Update();
//Create a mapper and actor
VTK_CREATE(vtkPolyDataMapper, mapper);
mapper->SetInputConnection(filter->GetOutputPort());
 
actor = vtkActor::New();
actor->SetMapper(mapper);
actor->GetProperty()->SetPointSize(3);
actor->GetProperty()->SetOpacity(0.3);
 -- Lubos Brieda --

Slovak recipes: www.slovakcooking.com 






________________________________
From: Lubos Brieda <lbrieda at yahoo.com>
To: vtkusers at vtk.org
Sent: Sat, March 26, 2011 9:50:40 AM
Subject: [vtkusers] volume rendering of unstructured points


Hi everyone,

I would like to visualize a large number of particles in a manner similar to the 
"CUDA Smoke Particles" demo (http://www.youtube.com/watch?v=4uoVRs_zLn8). First 
I thought this will be quite straightforward using the volume render (similar to 
the ironProt.vtk example). However, it appears than in order to use a volume 
renderer, my data needs to be an image map - which implies structured grid. My 
data is a large number of (x,y,z) coordinates. 

Question for you, what is the best approach? I can use VertexGlyphFilter 
(http://www.vtk.org/Wiki/VTK/Examples/Cxx/Filtering/vtkVertexGlyphFilter) to 
plot the individual points, but what I really need is for each point to be a 
semi-translucent filter so that in regions with many points the cloud appears 
darker. 

Thanks for all your help!
 -- Lubos Brieda --

Slovak recipes: www.slovakcooking.com 
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