Zbrush Transforms

Zbrush Transforms Demystified

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Substance Designer/Painter Usages

Type	Identifier	Usage
Ambient Occlusion	ambient_occlusion	ambientOcclusion
Anisotropy Angle	anisotropyangle	anisotropyangle
Anisotropy Level	anisotropylevel	anisotropylevel
Base Color	basecolor	basecolor
Color ID	id	colorID
Curvature	curvature	curvature
Diffuse	diffuse	diffuse
Height	height	height
IOR	ior	ior
Metallic	metallic	metallic
Normal	normal	normal
Position	position	position
Reflection	reflection	reflection
Roughness	roughness	roughness
Specular	specular	specular
Specular Level	specularlevel	specularlevel
Thickness	thickness	thickness
Transmissive	transmissive	transmissive
User 0	user0	user0
User 1	user1	user1
User 2	user2	user2
User 3	user3	user3
User 4	user4	user4
User 5	user5	user5
User 6	user6	user6
User 7	user7	user7
World space normals	world_space_normals	normalWS

Unity Shader Property Names

Legacy

• _MainTex (Texture, diffuse color in the RGB channels, transparency in the A channel)
• _Color (Color, diffuse color tint. This is multiplied by _MainTex)
• _SpecMap (Texture, specular map)
• _SpecColor (Color, specular color tint)
• _Shininess (Value or Slider, controls glossiness)
• _BumpMap (Texture, normal map)
• _TransparencyLM (Texture, rgb channels define colored transparency)
• _Illum (Texture, for emissive materials. This will be a mask of _MainTex * _Color)

Standard

• Albedo  (diffuse color)
• Normal (tangent space normal, if written)
• Emission
• Specular (specular power in 0..1 range)
• Gloss (specular intensity)
• Alpha (alpha for transparencies)

Physical (metallic)

• Albedo (base - diffuse or specular - color)
• Normal (tangent space normal, if written)
• Emission
• Metallic (0=non-metal, 1=metal)
• Smoothness (0=rough, 1=smooth)
• Occlusion (occlusion - default 1)
• Alpha (alpha for transparencies)

Physical (specular)

• Albedo (diffuse color)
• Specular (specular color)
• Normal (tangent space normal, if written)
• Emission
• Smoothness (0=rough, 1=smooth)
• Occlusion (occlusion  - default 1)
• Alpha (alpha for transparencies)

Unity3D Geometry LOD Stuff

• Level of Detail (LOD)
  "Unity lets you set maximum LOD levels and a LOD bias preference (ie, whether to favour higher or lower LOD levels at threshold distances) in the Quality Settings."

Unity3D Shader LOD Stuff

Unity3D Documentation:

• Shader LOD Values
  VertexLit kind of shaders = 100
  Decal, Reflective VertexLit = 150
  Diffuse = 200
  Diffuse Detail, Reflective Bumped Unlit, Reflective Bumped VertexLit = 250
  Bumped, Specular = 300
  Bumped Specular = 400
  Parallax = 500
  Parallax Specular = 600
  
• Global Shader LOD Setting

Shader Forge:

• Shader Forge Subshader Workaround
  "There's no way to make subshaders in SF at the moment, but you can define a fallback shader and specify the LOD level"

Conversion Chart

Decimal	8bit	Angular
0.05	13	18
0.1	26	36
0.15	38	54
0.2	51	72
0.25	64	90
0.3	77	108
0.35	90	126
0.4	102	144
0.45	115	162
0.5	128	180
0.55	141	198
0.6	154	216
0.65	166	234
0.7	179	252
0.75	192	270
0.8	205	288
0.85	218	306
0.9	230	324
0.95	243	342
1.0	255	360

PBR Spec/Gloss to Metal/Rough

• Invert Gloss to generate Roughness
• Metal must be done manually.
• Diffuse/Albedo is more trick if the material is metallic. Spec color is a base for albedo, since Diffuse is black for metals.