View source for VRChat/Substance Painter

[[Substance Painter]] is great software for painting textures and baking AO.  However, getting it to work with Unity can be a massive pain in the ass.

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So, here's how.

== Exporting From ==

=== Blender ===

# Install [[CATS]].
# Ensure you've tweaked the UV atlas as best you can, as you will be unable to use the Auto-Unwrap feature in Substance (rigs get nuked).
# Export as an FBX using CATS.

== Importing Meshes ==

# Open Substance.
# Select File > New...
## Select the ''Unity HD Render Pipeline (Metallic Standard)'' template. A pipeline for specular is apparently missing.
## Select the FBX or OBJ you want.
## Set ''Document Resolution'' to as much as your PC will suffer.  I personally use 4096 for everything.
## '''Make absolutely certain''' you're using OpenGL Normal Map Format.
## If your atlas is screwed up and you're OK with nuking rigs/etc, go ahead and check Auto-Unwrap.
##* Seams: Will automatically recalculate all seams if set to Recompute All. Recommend leaving this on Generate Only Missing Data unless the model is turbofucked.
##* UV Islands: UV Islands are the chunks of mesh thrown onto the atlas. This setting affects whether Substance will automatically re-generate islands (Recompute) or use existing ones.
##* Packing: Packing is how well the islands are crammed onto the atlas so they all fit.  Substance does an excellent job with this, so if you can, Recompute all. (Don't use for anything with rigging)
## Smack OK and wait.
# Important: Press CTRL+SHIFT+B to bring up the baking window. so you can bake AOs and normals.  These are used in Smart Materials.
## In Common Settings:
### Change ''Output Size'' to something like half of your document resolution. (2048 in 4096 documents, etc)
### Change ''Antialiasing'' to as high as your computer will suffer.  I use ''Subsampling 8x8''.  '''This will significantly impact baking time.'''
### Change ''Match'' to ''By Mesh Name'' so you get fewer weird ray-tracing issues caused by intersecting with clothing or whatnot.
## Hit OK to Bake.  Go grab a coke.