[Paraview] Problem loading multiple volumes in ParaviewWeb

[Rajvikram Singh]

Thanks Sebastien .. that was the problem :) It works fine now and I can switch the different datasets on/off.




--- On Thu, 28/4/11, Sebastien Jourdain <sebastien.jourdain at kitware.com> wrote:

From: Sebastien Jourdain <sebastien.jourdain at kitware.com>
Subject: Re: [Paraview] Problem loading multiple volumes in ParaviewWeb
To: "Rajvikram Singh" <rajvikrams at yahoo.com>
Cc: paraview at paraview.org
Date: Thursday, 28 April, 2011, 6:19 PM

Hi Raj,
The reason why you are not seeing the same settings across your data is because you need to apply your SetDisplayProperties for each loaded data. The reason why only the last one is set correctly, it's because ParaView has a stack of active objects. And since the SetDisplayProperties requires a "proxy" and a "view", if you do not provide them, ParaView will use the last one created.

So to solve what you are facing you have to call the following code:

 pv.SetDisplayProperties( {
            proxy: data1,
            view  : view1,
            SelectMapper : 'GPU',

            Representation : 'Volume',
            LookupTable : lut1,
            ColorArrayName : 'ImageFile',
            ScalarOpacityFunction : f,
            } );


But the best way to go might be to define a method that do that

function setDisplayProperties( data ) {
   pv.SetDisplayProperties( {
            proxy: data,

            view  : view1,
            SelectMapper : 'GPU',
            Representation : 'Volume',
            LookupTable : lut1,
            ColorArrayName : 'ImageFile',
            ScalarOpacityFunction : f,

            } );}

and then just call

setDisplayProperties(data1);setDisplayProperties(data2);

Seb

On Wed, Apr 27, 2011 at 6:32 PM, Rajvikram Singh <rajvikrams at yahoo.com> wrote:

Hi everyone .. Greetings !



   I'm trying to create a web visualization page where biologists in our
 lab can see their multi-channel volume data. Each channel is a separate
 file and since there could be as many as 11-12 channels I want to give 
them the ability to switch the volumes on/off or even see two volumes in
 the same space. 





To test this I wrote the following Javascript code to load two volume 
files (.vtk) and then show only one. The problem is though I get no 
errors, I can only see the last file that's loaded (I've tried different
 combination of files). When I try to show the first file, all I see is a
 gray box instead of the data.





 It almost feels like the OpenDataFile() function is using the same 
object and overwrites it. I'm new to Javascript and would not be 
surprised if I'm doing something silly but any advice is sincerely 
appreciated.





Javascript Code :





            // Set the web service base URL


            var serverUrl = 
"<%=request.getScheme()%>://<%=request.getServerName()%>:<%=request.getServerPort()%>/PWService";


            //


            // Create a paraview proxy


            //


            var pv = new Paraview(serverUrl);


            pv.createSession("Test Visualization", "Ver 0.1", "default");


            var view1 = pv.CreateIfNeededRenderView();


            pv.Render();


    


            // Load the data files in RAM


            var data1 = pv.OpenDataFile('test1.vtk');


            var Representation1 = pv.Hide({proxy: data1});





            var data2 = pv.OpenDataFile('test2.vtk');


            var Representation2 = pv.Hide({proxy : data2});


            


            


            // Init view parameters


            var lut1 = pv.GetLookupTableForArray({arrayname : 
"ImageFile", num_components : 1, HSVWrap : 0, NanColor : [0.0, 
0.66666666666666663, 0.0], RGBPoints : [1.0, 0.0, 0.0, 0.0, 
16564.27904630101, 1.0, 0.035950255588616767, 0.0, 19924.923666800998, 
1.0, 0.035950255588616767, 0.0, 39728.909301543368, 0.0, 
0.66666666666666663, 0.0, 65294.000000000007, 0.0, 0.0, 0.0], ColorSpace
 : 'HSV'});





            var f = pv.CreatePiecewiseFunction( {Points:[0.0, 0.0, 
2762.37, 0.0588235, 2882.47, 0, 6965.97, 0.235294, 15373.2, 0.323529, 
25221.6, 0, 26662.9, 0, 36751.5, 0, 44318, 0.0, 52124.7, 0.323529, 
63054, 0.294118, 65336, 0.294118] });








            pv.SetDisplayProperties( {


            view  : view1,


            SelectMapper : 'GPU',


            Representation : 'Volume',


            LookupTable : lut1,


            ColorArrayName : 'ImageFile',


            ScalarOpacityFunction : f,


            } );





            // Show one dataset only


            pv.Show({proxy : data2});






Thanks in advance

Raj
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