Material Rendering Variable Names

Names for material and rendering variables. These names are a guideline not a rule.

Material Variables

Name	Type	Range	Description
`baseColor`	`float3`		Base color of material, aka `albedo`
`roughness`	`float`	[0, 1]	Roughness for both dielectric and metals, aka `perceptualRoughness`
`metallic`	`float`	[0, 1]	1 = metal material, 0 = dielectric material
`specular`	`float`	[0, 1]	Specular reflection strength for rough dielectric materials, use `0.5` if in doubt
`ior`	`float`		Index of refraction

Name	Type	Description
`P`	`float3`	Surface position
`N`	`float3`	Normalized surface normal
`E`	`float3`	Eye position
`V`	`float3`	Normalized view vector: `V = normalize(E - P)`
`I`	`float3`	Normalized incident vector: `I = -V`
`R`	`float3`	Normalized reflection vector: `R = reflect(-V, N)`
`H`	`float3`	Normalized half vector: `H = normalize(L + V)`
`L`	`float3`	Normalized light vector: `L = normalized(Lp - P)`
`Lp`	`float3`	Light position
`Lc`	`float3`	Light color
`Ls`	`float`	Light intensity
`Rd`	`float3`	Diffuse bidirectional reflectance
`Rs`	`float3`	Specular bidirectional reflectance
`Cd`	`float3`	Diffuse color remapped from `baseColor` (or `albedo`): `Cd = baseColor * dielectric`
`F0`	`float3`	Fresnel at 0 degrees: `F0 = (0.16 * specular * specular * dielectric) + (baseColor * metallic)`
`alpha`	`float`	Squared value of `roughness` (or `perceptualRoughness`) from material: `alpha = roughness * roughness`
`dielectric`	`float`	1 = dielectric material, 0 = metal material: `dielectric = (1 = metallic)`