i have this tree:
grid -> shop -> point1 -> layer -> point2

in shop: i apply vex layered surface with default setting.
point1: set to add color (red) , this will add Cd attribute.
layer : set layer to 2
point2: set to add color (blue), this will add Cd2 attribute.

the final output in preview pane show the blue color which i want it to be,
but the render output is red. what i'm thinking is the Cd2 is at layer2 , Cd is at base layer, so Cd2 should override the Cd (Cd2 on top of Cd). but why the render still give me the red one? confusing..
pls help

thx