Changes the color modulation of an object. This is a color value which is multiplied with the object color.
RGB(255,0,0) will only let the red part of the color show.
RGBa(255,255,255,128) will make all color half transparent.
GetCursor()->SetClrModulation(RGBa(128,128,255,128));
Colors the selected clonk of the first player slightly blue and makes him half transparent.