I've been messing with effects and blend modes recently .
By adding the "source atop" blend mode on an object that is above another one , i get this result ( which is correct ) :
By adding the "source atop" on the layer that contains both objects (and setting the blend mode of both objects to normal) , i get this (nothing) :
My question is : Why changing the blend mode of the layer did nothing to the objects ? How do blend modes work specifically on layers ? I've searched online , but i didn't find any specific description of how blend modes work in layers .
Thanks in advance .