Layering defines how Effect 1 and Effect 2 will be mixed together.
Here are the Choices
Effect 1: Shows only Effect 1. Slide the slider to the right to blend in some Effect 2.
Effect 2: Shows only Effect 2. Slide the slider to the right to blend in some Effect 1.
1 is Mask: (Shadow) Effect 1 will cast a shadow onto Effect 2 for every Effect 1 pixel that has a non-black value.
2 is Mask: (Shadow) Effect 2 will cast a shadow onto Effect 1 for every Effect 2 pixel that has a non-black value.
1 is UnMask: (Mask) Only allow Effect 2 to show through when Effect 1 has a non-black pixel.
2 is UnMask: (Mask) Only allow Effect 1 to show through when Effect 2 has a non-black pixel.
Shadow 1 on 2: Take brightness and Saturation from 1, use hue from 2
Shadow 2 on 1: Take brightness and Saturation from 2, use hue from 1
1 reveals 2: (Superimpose) Effect 1 reveals Effect 2
2 reveals 1: (Superimpose) Effect 2 reveals Effect 1
Average: Take value of Effect and Add it to Value from Effect 2. Average the sum
Bottom-top: Effect 1 is put on bottom of model, Effect 2 is put on top in a plit screen display
Left-Right: Effect goes 1 goes on the left side, Effect 2 on the right. Split screen goes down middle of model.
Copied and pasted directly from the xLights code. But a screen capture did help verify.