The Add Sub and Overlay blending modes

The following is how the Add Sub blending mode operates:

• Any Foreground pixels that have a value greater than 0.5 are combined with the corresponding Background pixels
• Pixels in Foreground that have a value less than 0.5 are deducted from the corresponding pixels in Background

The Overlay blending mode, which is a non-commutative mode, in contrast, combines the Multiply and Screen blending mode and operates as follows:

• A blend of the Multiply type is used if the lower layer’s pixel value is less than 0.5
• Screen type blending is used if the lower layer’s pixel value is greater than 0.5

Let us work on these two nodes in practice in the following steps:

1. Open AddSub_and_Overlay.sbs from the given Substance 3D Designer exercise files, load the AddSub_and_Overlay.sbsscn state file, then choose Plane (hi-res) from the Scene menu. Right-click with the mouse in the GRAPH window and choose View...