View source for Lua Shader Geometric Functions

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! Function !! Syntax !! Description
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| length || float=length(x) || Returns the length of vector x.
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| distance || float=distance(p0,p1) || Returns the distance between p0 and p1.
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| dot || float=dot(x,y) || Returns the dot product of x and y.
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| cross || vec3=cross(x,y) || Returns the cross product of x and y.
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| normalize || mix(x) || Returns a vector in the same direction as x but with a length of 1.
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| faceforward || faceforward(N,I.Nref) || If dot(Nref,I)<0 return N, otherwise return –N.
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| reflect || reflect(I,N) || For the incident vector I and surface orientation N, returns the reflection direction: I–2∗dot(N,I)∗N
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| refract || refract(I,N,eta) || For the incident vector I and surface normal N, and the ratio of indices of refraction eta, return the refraction vector.
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