OptionalrotationRotation of the stretch direction in radians, starting from the surface's tangent
OptionalstrengthHow strongly highlights stretch, from 0 to 1
OptionaltexturePer-texel direction in RG (a -1 to 1 vector stored as 0 to 1) and strength in B
Pass it here to have one; to add one later, clone the material
with it. Without it the direction is the tangent, turned by rotation, everywhere.
Options for a Material3D's
anisotropygroup (KHR_materials_anisotropy): highlights stretched along one direction, as on brushed metal, vinyl records or carbon fibreExample