Add-Sub mode for Math Nodes
Add-Sub is a common blend mode in applications like Substance or Photoshop.
Basically two values are combined. If the second value is above .5 it's added, if it's below .5 it's subtracted.
substance3d.adobe.com/documentation/sddoc/blending-modes-description-132120605.html
1 Comment
I think the equation for it is this is roughly: A + ( ( B - 0.5) * 2.0 ), Not sure if linear light in blender is the same, but this blend mode is necessary for stacking heightmaps in a displacement workflow (for example adding high frequency maps to a lower frequency heightmap). However, I would put it in the mix node and not math. I would be interested to compare this against linear light to see if the results are more accurate or if it's basically(or exactly) the same.