The introduction of substrate is a welcome and exciting development. The ability to refine material creations seems very promising to say the least. I may be alone on this however but I have found that authoring in substrate can be very convoluted and not very artist friendly. Some concepts seem to be relevant only to specific scenarios or there are more than 1 way of doing something that produces different results so it creates confusion. An example is the surface thickness and how it relates to say the other thickness parameters that appear in quite a few other nodes. Using it directly from the vertical layer produces something totally different from using it directly from the Transmittance-MFP node and I’ve seen some people use the coverage weight as well to control the blending…Another example a 0 Top thickness shows nothing of the top layer which is correct however when the roughness is turned down it shows as a reflective film around it even though my top thickness is still 0…How does thickness relate to Top thickness?
Why for example is fuzz or glint part of the main slab and not part of the helpers. Are these properties inherent in all natural materials by default…?!
I would like to reiterate my enthusiasm for this new system - I may be alone here but I feel it should be more logical in how it works so that more people can take advantage of its capabilities.