Texturing Combining

[TokisanGames]

The Witcher3 presentation p14-30 discusses the creation of new textures by combining two others with various parameters. Code for blending is also provided.
https://ubm-twvideo01.s3.amazonaws.com/o1/vault/GDC2014/Presentations/Gollent_Marcin_Landscape_Creation_and.pdf

This shader may also be useful in combining
https://godotshaders.com/shader/cheap-terrain-with-fake-normal-map-or-pom/

Triplanar mapping

• This section will likely be moved
• It looks like p33-35 they use triplanar mapping for the base texture and discuss adjustable tightening to reduce lookups from 3 to 1/2 in some cases
• Implement 3D projection #65 is still on the table
• The two most common triplanar methods (Godot's and Zylann's) weaken normals in Godot. This shader might not have that problem.
• This video offers an alternate solution

Dual scaling to fractal scaling

https://mini.gmshaders.com/p/gm-shaders-mini-fractal-texturing-1408552

[TokisanGames]

Regarding texture combining, @Xtarsia wrote on discord:

if we add a "materials" tab next to textures, we can use the 127 values from the blend bits, combined with the auto shader as a flag (the default 0 index being the current auto shader)

and then do what ever custom thing we want for that control pixel.
it does mean that painting auto shader would destroy any existing blend value tho
alternativley, leave blend, and use the bits from both overlay and base
then the upto 63 materials can be set as either base/over, which would allow blending with none auto flagged pixels better
a material could even contain a custom shader snippet, which would be inserted into the shader when its generated 😄