Hi Zhaopeng,
I can't see any problem with your code. It is very
similar to visad/examples/Test61.java, which works fine.
It could be that your data do not contain enough
zero values to create much transparency.
Cheers, Bill
On Mon, 15 Apr 2002, Zhaopeng Lei wrote:
> Hi there
> I am using RGBA in volume rendering(dataset 109*256*256). My expected
> effect is to let pixels where data value equals 0 to be complete transparent.
> However, the result looks like a cube filled with black ink.
> Could you please tell me what's wrong with my code? Thanks a lot.
>
> int tableLength = 10;
> float[][] myColorTable = new float[4][tableLength];
> for(int i=0;i<tableLength;i++){
> myColorTable[0][i]=(float)(float)i/((float)tableLength-1.0f);//red
> myColorTable[1][i]=(float)(float)i/((float)tableLength-1.0f);//green
> myColorTable[2][i]=(float)(float)i/((float)tableLength-1.0f);//blue
> myColorTable[3][i]=(float)(float)i/((float)tableLength-1.0f);//alpha
> }
>
> // Force top of table to be white
> myColorTable[0][9]=1.0f;
> myColorTable[1][9]=1.0f;
> myColorTable[2][9]=1.0f;
> myColorTable[3][9]=1.0f;
>
> // Get the ColorControl from the altitude RGB map
> ColorAlphaControl colCont = (ColorAlphaControl)
> valueRGBMap.getControl();
> // Set the table
> colCont.setTable(myColorTable );
>
>
>
> - Zhaopeng :-)
>
>
> -_____ ^ _____-
> -__\ [|] /__-
> -_\|/_-
> /M\
>
>
>
