[vtkusers] Re: Re: Fw: Glyph3D questions
Roger Blum
roger_blum at swissonline.ch
Fri Sep 2 23:15:45 EDT 2005
Hi John,
I've tried this, but I could not make it work the way I want. But I 've
found
a solution that will do for my prototype by creating an actor with
vtkGlyph3D
for every glyph type / color combination I use. But this can not be the
final
solution.
But I have to delay the search for a better solution to later.
Kind regards,
Roger
"John Platt" <jcplatt at lineone.net> schrieb im Newsbeitrag
news:001b01c5adb3$55c0b110$84aa2f50 at pacsys4...
> Hi Roger,
>
> In 4.4, the trick is to use point scalars with 2 components. The 1st
> component can be used for scaling and the 2nd component passed on to the
> glyph mapper for colour mapping. You must use
> vtkGlyph3D::SetColorModeToColorByScalar() to copy the input scalars to
> the output.
>
> In your glyph mapper, colour by component 1 -
>
> ScalarVisibilityOn();
> ColorByArrayComponent( "myscalarname", 1 );
>
> HTH
>
> John.
>
> -----Original Message-----
> From: vtkusers-bounces+jcplatt=lineone.net at vtk.org
> [mailto:vtkusers-bounces+jcplatt=lineone.net at vtk.org] On Behalf Of Roger
> Blum
> Sent: 30 August 2005 21:10
> To: vtkusers at public.kitware.com
> Subject: [vtkusers] Re: Fw: Glyph3D questions
>
> Hi John,
>
> As I am working on a protoype right now with a very tight time and
> money budget, I can not change the vtk version right now. I will
> find a way to display the glyphs with one actor per color and type.
> This will work in a short time and will show the customer what he
> wants to see.
> But I will have to upgrade for the real application. I then might
> contact
> you again for additional information.
>
> Thanks again,
> Roger
>
> "John Biddiscombe" <biddisco at cscs.ch> schrieb im Newsbeitrag
> news:43146065.9020307 at cscs.ch...
>> Roger,
>>
>> I think you may not be able to do what you want with earlier versions
> of
>> glyph3D. I can't remember when (a couple of months back?), but I added
>
>> some code to make different scalars used for different
> colouring/scaling.
>> Indexing should be ok (look harder it is possible I'm sure). I've not
>> looed at the code for old versions today so I realy can't remember. If
> you
>> can update to a new vtk version (cvs) then give it a try. If you have
> a
>> lot of homemade filters, probably you've got some work to do, but if
> not,
>> then the pain shouldn't be too much.
>>
>> JB
>>
>>
>> Roger Blum wrote:
>>
>>>
>>> ----- Original Message ----- From: "Roger Blum"
> <rogerblum at hawaii.rr.com>
>>> To: "John Biddiscombe" <biddisco at cscs.ch>
>>> Sent: Monday, August 29, 2005 3:50 PM
>>> Subject: Re: [vtkusers] Glyph3D questions
>>>
>>>
>>>> Hello John,
>>>>
>>>> Thanks for your answer.
>>>> I have been trying to make it work, but had no succes till now.
>>>> I haven't mentioned in my posting that I use vtk 4.4.2 and script it
>
>>>> with Tcl.
>>>>
>>>> After searching all of the examples I still cannot figure out, how
> to
>>>> supply
>>>> the extra information (a color index, a type index and a direction)
> to
>>>> the
>>>> vtkGlyph3D object.
>>>> The method you supposed "SetInputArrayToProcess" doesn't seem to
>>>> exist (in this version of vtk?).
>>>> So how does vtkGlyph3D know which type of glyph and color to assign
>>>> to a node? How do I have to construct the input for vtkGlyph3D?
>>>>
>>>> I've also checked the source code vtkGlyph3D.cxx and it seems to
> only
>>>> use one scalar value for the scaling, indexing and color selection.
> Is
>>>> this
>>>> correct? If yes, I wouldn't be able to do what I want then. I would
> have
>>>> to create one Glyph3D per type or per color.
>>>>
>>>> Thanks again for your help,
>>>> Roger
>>>>
>>>> ----- Original Message ----- From: "John Biddiscombe"
> <biddisco at cscs.ch>
>>>> To: "Roger Blum" <roger_blum at swissonline.ch>
>>>> Cc: <vtkusers at public.kitware.com>
>>>> Sent: Thursday, August 25, 2005 9:23 PM
>>>> Subject: Re: [vtkusers] Glyph3D questions
>>>>
>>>>
>>>>> Using vtk from recent CVS (glyph3D has changed a lot since vtk4.4),
> to
>>>>> display a different object for each type, with a differnet colour,
> I
>>>>> use this snippet. In this case data scaling is off, but if you
> wanted
>>>>> to do scaling too then you can add another SetInputArrayToProcess
> call.
>>>>> Likewise for orientation. If you can't get orientation working,
> then
>>>>> ask me again and I'll have another look inside the glyph3D code, I
> cant
>>>>> remember if orientation can be specified separately from other
> scalars
>>>>> etc.
>>>>>
>>>>> NodeGlyphs->SetInput(NodeData);
>>>>> NodeGlyphs->SetColorModeToColorByScalar();
>>>>> NodeGlyphs->SetScaleModeToDataScalingOff();
>>>>> NodeGlyphs->SetScaleFactor(0.25);
>>>>> NodeGlyphs->SetScaling(1);
>>>>> NodeGlyphs->SetIndexModeToScalar();
>>>>>
>>>>>
> NodeGlyphs->SetInputArrayToProcess(0,0,0,vtkDataObject::FIELD_ASSOCIATIO
> N_POINTS,
>>>>> "nodeTypes");
>>>>>
>>>>>
> NodeGlyphs->SetInputArrayToProcess(3,0,0,vtkDataObject::FIELD_ASSOCIATIO
> N_POINTS,
>>>>> "nodeColours");
>>>>>
>>>>> for (int i=0; i<this->NumGlyphObjects; ++i) {
>>>>> NodeGlyphs->SetSource(i, this->GlyphObjects[i]);
>>>>> }
>>>>> NodeGlyphs->SetRange(0,NODET_MAX);
>>>>> NodeGlyphs->Update();
>>>>>
>>>>> In the above code, we assume that there is an array called
> "nodeTypes"
>>>>> and another "nodeColours" which is present on the pointdata of the
>>>>> NodeData object.
>>>>>
>>>>> JB
>>>>>
>>>>>
>>>>> Roger Blum wrote:
>>>>>
>>>>>> Hello,
>>>>>>
>>>>>> I have checked the manual, examples and news list but couldn't
> find
>>>>>> the
>>>>>> solution to my problem.
>>>>>>
>>>>>> I would like to use a vthGlyph3D filter to display my data.
>>>>>> For each glyph I have
>>>>>> - a point (X,Y,Z)
>>>>>> - a direction (X,Y,Z)
>>>>>> - a color code (1,...,n)
>>>>>> - a type code (1,...,n)
>>>>>>
>>>>>> With this information I would like to show the glyphs (type
> depending
>>>>>> on type code)
>>>>>> with a specific color (depending on color code) at a position
> (point)
>>>>>> with a direction
>>>>>> at a fixed size (not influenced by zooming).
>>>>>>
>>>>>> How do I have to set up and connect the needed objects so my
>>>>>> vtkGlyph3D object
>>>>>> generates the desired output?
>>>>>>
>>>>>> Thanks for your help,
>>>>>> Roger
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> This is the private VTK discussion list. Please keep messages
>>>>>> on-topic. Check the FAQ at: http://www.vtk.org/Wiki/VTK_FAQ
>>>>>> Follow this link to subscribe/unsubscribe:
>>>>>> http://www.vtk.org/mailman/listinfo/vtkusers
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> John Biddiscombe, email:biddisco @
> cscs.ch
>>>>> http://www.cscs.ch/about/BJohn.php
>>>>> CSCS, Swiss National Supercomputing Centre | Tel: +41 (91)
> 610.82.07
>>>>> Via Cantonale, 6928 Manno, Switzerland | Fax: +41 (91)
> 610.82.82
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> This is the private VTK discussion list. Please keep messages
> on-topic.
>>>>> Check the FAQ at: http://www.vtk.org/Wiki/VTK_FAQ
>>>>> Follow this link to subscribe/unsubscribe:
>>>>> http://www.vtk.org/mailman/listinfo/vtkusers
>>>>
>>>>
>>>
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>>
>>
>>
>> --
>> John Biddiscombe, email:biddisco @ cscs.ch
>> http://www.cscs.ch/about/BJohn.php
>> CSCS, Swiss National Supercomputing Centre | Tel: +41 (91) 610.82.07
>> Via Cantonale, 6928 Manno, Switzerland | Fax: +41 (91) 610.82.82
>>
>>
>> _______________________________________________
>> This is the private VTK discussion list. Please keep messages
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>
>
>
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