From: deum (deum++at++sgi.com)
Date: 06/10/2003 03:35:29
Simone,
Just try to put the full opacity on your alpha component (255 for 8
bits, 1.0 for float)
keeping the linear transfer function for the others RGB componants.
Then you will be able to see if your volume is present or not.
check also your volume is not black on black !
This code can be applied (not compiled but _have_ to work).
vzParameterLookupTable*
MyObj::initLookupTable(int width)
{
// Initialize a LUMINANCE_ALPHA lookup table
float* data = new float[4*width];
for (int i = 0; i < width; i++) {
data[i * 4 + 0] = Rvalue (i); // Red Transfert Function in [0..1]
data[i * 4 + 1] = Gvalue (i); // Green Transfert Function in [0..1]
data[i * 4 + 2] = Bvalue (i); // Red Transfert Function in [0..1]
data[i * 4 + 3] = 1.0; // Alpha value alway as an OPAQUE transfert
function
}
vzParameterLookupTable* table =
new vzParameterLookupTable(width, data, VZ_FLOAT, VZ_RGBA);
return table;
}
...
vzParameterLookupTable* myTable = initLookupTable(width);
...
Yves
Praveen Bhaniramka wrote:
>Hi Simone,
>
>Did you define the parameter "lookup_table" appropriately for the shape's
>appearance? You will still need to do the LUT initialization and other
>stuff that you had mentioned in your code snippet! Do you get any errors
>printed on the console?
>
>- Praveen
>
>On Tue, 10 Jun 2003, Simone Herrmann wrote:
>
>
>
>>Hi Praveen,
>>
>>I tried this and now my volume volume is not visible any more.
>>What happened?
>>
>>Praveen Bhaniramka <praveenb++at++mrcoffee.engr.sgi.com> schrieb am 09.06.03 18:44:52:
>>
>>
>>>Hi Simone,
>>>
>>>The various parameters attached to the shape's appearance are used by the
>>>shader, which uses them to do the actual shading (in your case applying a
>>>lookup table). So, adding new parameters will only have any effect if the
>>>corresponding shader _uses_ these parameters.
>>>
>>>In short, update the shader for the shape's appearance to use the
>>>TMLUTShader, which would then apply the lookup table.
>>>
>>>vzTMLUTShader *newShader = new vzTMLUTShader();
>>>vol->getShape()->getAppearance()->setShader(newShader);
>>>
>>>Cheers,
>>>Praveen
>>>
>>>On Mon, 9 Jun 2003, Simone Herrmann wrote:
>>>
>>>
>>>
>>>>Hi,
>>>>
>>>>How can I apply a lookup table to a volume in the pfVolume node?
>>>>
>>>>I tried:
>>>>
>>>>vzParameterLookupTable* myTable = myLoadLookupTable();
>>>>
>>>>pfVolume* vol = new pfVolume;
>>>>vol->readFile("myVolume.vz");
>>>>vol->getShape()->getAppearance()->setParameter("lookup_table", myTable);
>>>>
>>>>but the image still remains uncoloured.
>>>>
>>>>Thanks,
>>>>Simone
>>>>______________________________________________________________________________
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>>>>
>>>--
>>>-----------------------------------------------------------------
>>>Praveen Bhaniramka Member of Technical Staff (MTS)
>>>praveenb++at++sgi.com Advanced Graphics Division
>>>(650)933-1785 Silicon Graphics, Inc.
>>>-----------------------------------------------------------------
>>>
>>>
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>>
>>
>
>
>
---- Yves DEMANGE -- S G I -- EMEA Visualization Solutions group -- Phone : +33 4 4210-1868 / Mobile : +33 6 8553-8264 -- Email : deum++at++sgi.com
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