Andrew:
I believe that all values in your myColorTable array should be in the range
(0., 1.0), so you might want to use something like
((float(i)/float(dataDepth))...
tom
Andrew Donaldson wrote:
>
> > You can do it with a ScalarMap to Display.RGBA. The
> > getControl() method for this ScalarMap will return a
> > ColorAlphaControl, and you can call its setTable() method
> > to set the 4-component lookup table for red, green, blue
> > and alpha. See Sections 4.6 and 4.11 of the tutorial for
> > more details.
>
> Hey, that was really obvious now that you point it out!
> Thanks guys. It's not working at the moment, I can certainly
> change the colours, but the alpha doesn't change. Is it something
> to do with me using ImageRendererJ3D?
>
> My code is:
> // Add a scalarMap to map the samples to RGBA
> ScalarMap range2D = new ScalarMap(
> (RealType)rtype.getComponent(0),
> Display.RGBA);
> display.addMap(range2D);
>
> // Create a RGBA lookup table
> final int dataDepth = 16;
> myColorTable = new float[4][dataDepth];
> for(int i=0; i<dataDepth; i++) {
> myColorTable[0][i]= (float)0; // red
> myColorTable[1][i]= (float)0; // green
> myColorTable[2][i]= (float)i; // blue
> myColorTable[3][i]= (float)i; // alpha
> }
> // This does change the background to grey
> myColorTable[0][0]= (float)0.5;
> myColorTable[1][0]= (float)0.5;
> myColorTable[2][0]= (float)0.5;
> myColorTable[3][0]= (float)0.5;
>
> // ColorControl control
> (ColorControl)range2D.getControl();
> // control.initGreyWedge();
> // control.initVis5D();
> ColorAlphaControl control
> (ColorAlphaControl)range2D.getControl();
> control.setTable(myColorTable);
>
> thanks again,
>
> Andrew.
>
> --
> Andrew Donaldson
> Email: A.Donaldson@xxxxxxxxxx Bureau of Meteorology
> Phone: +61 3 9669 4537 P.O. Box. 1289K/150 Lonsdale St,
> Fax: +61 3 9669 4128 Melbourne, Australia.
--
Tom Whittaker (tomw@xxxxxxxxxxxxx)
University of Wisconsin-Madison
Space Science and Engineering Center
Phone/VoiceMail: 608/262-2759
Fax: 608/262-5974
