Re: a beginner's question

• To: Zhaopeng Lei <zlei@xxxxxxxxxxxxxxx>
• Subject: Re: a beginner's question
• From: Bill Hibbard <billh@xxxxxxxxxxxxx>
• Date: Mon, 8 Apr 2002 17:46:37 -0500 (CDT)

Hi Zhaopeng,

> I'm doing volume rendering. Function is (x,y,z)->value.
> I use following code to map value without any colormap:
>
> valueAlphaMap = new ScalarMap(value, Display.Alpha);
> display.addMap( valueAlphaMap );
>
> The problem is that the 0-value poxel is also white. What I want is to make 
> poxel's color from white to gray according to its value, while let 0-value 
> poxel be completely transparent. How can I do it? Thanks a lot.

Try a ScalarMap to RGBA instead. Use the setTable() method of its
ColorAlphaControl to get more control over color and alpha values.

Good luck,
Bill

• References:
  • a beginner's question
    • From: Zhaopeng Lei