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1.0.4. Tangents

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According to official Unity documentation:

“A tangent is a vector of a unit of length that follows the mesh surface along the direction of the horizontal texture.” 

What does this mean? Look at Figure 1.0.4a to understand its nature. The Tangent is a normalized vector that follows the U coordinate orientation of the UV on each geometry face. Its main function is to generate a space called Tangent-Space

(Fig. 1.0.4a.  By default, BiNormals cannot be accessed in a shader. Instead, they need to be calculated in relation to the Normals and Tangents.)

This property is reviewed in detail later, in Chapter II, section 6.0.1, as well as the Binormals for the implementation of a Normal Map over an object.

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Jettelly Team

We are a team of indie developers with more than 9 years of experience in video games. As an independent studio, we have developed Nom Noms in which we published with Hyperbeard in 2019. We are currently developing The Unity Shader Bible.

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