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https://github.com/patriciogonzalezvivo/thebookofshaders
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24 lines
632 B
Markdown
24 lines
632 B
Markdown
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## Reflect
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Calculate the reflection direction for an incident vector
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### Declaration
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```glsl
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float reflect(float I, float N)
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vec2 reflect(vec2 I, vec2 N)
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vec3 reflect(vec3 I, vec3 N)
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vec4 reflect(vec4 I, vec4 N)
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```
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### Parameters
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```I``` specifies the incident vector.
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```N``` specifies the normal vector.or.
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### Description
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For a given incident vector ```I``` and surface normal ```N``` reflect returns the reflection direction calculated as ```I - 2.0 * dot(N, I) * N```.
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```N``` should be normalized in order to achieve the desired result.
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### See Also
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[dot()](index.html#dot.md), [refract()](index.html#refract.md)
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