glow filter sample

ive been looking at the glow filter sample because im trying to figure out how to make a sphere glow and have glowing particles coming off of it but i cant figure out how they get the certain parts of him to only glow, how do they do it?

EDIT: I would also like to know how they choose the color the glow is.

The glow sample has color and a glow channel. The color of the glow is taken out of the color channel.

treeform: for the MModulateGlow mode, yes. For the MGlow mode, the color channels are ignored.

This page explains how to achieve it:
panda3d.org/manual/index.php/C … ge_Filters