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The tangents of the mesh.
Tangents are mostly used in bump-mapped shaders. A tangent is a unit length vector that follows mesh
surface along horizontal (U) texture direction. Tangents in Unity are represented as Vector4,
with x,y,z components defining the vector, and
w used to flip the binormal if needed.
wshould always be 1 or -1.You should calculate tangents yourself if you plan to use bump-mapped shaders on the mesh. Assign tangents after assigning normals or using RecalculateNormals.