Hi,
To keep it simple, I've built a brick wall and want to show shading of the boards on top of the wall as if the sun were shining down casting a shadow from the top board down onto the bricks. In other words, a gradient effect just under the top board darkening the bricks a bit as if it were shade from the sun.
You might be able to see this better if it were a door frame casting a shadow onto the door.
I hope all this makes since... :?
thanks,
Rick
P.S. I also can not find an opacity level tool when applying layers. I usually use this 'tool' for lettering signs and things causing the letters to 'fade' into the background application. Such as on an old brick wall with very worn letters or a wooden sided building.