I remember when i used c-script i could make neutral color on 128 and 0 was black or 255 was white, but now in lite-c it seems only adding on texture already existing color so there is no black color because at 0 its neutral texture color. So is there way to get this coloring on texture or i will need use some material?

Im speaking about:
set(my, LIGHT);
vec_fill(my.blue, 0);//or any value