using threshold in volume rendering

[Heiko Gleitsmann]

Hi everyone,

I´m interested in volume rendering and wondering if the threshold from
grayscales could applied to RGB volumes. Can somebody tell me if there is a
way? The problem is that I want to render RGB images and don´t know hot to
handle the threshold. Is it possible to convert a (grayscale-) threshold to
a RGB threshold?

My first idea was:

int threshold = tresh<<16 + tresh<<8 + tresh;

but this seems a little bit silly.

Can somebody help???

THX in advance

--
regards
heiko