Lua Shader Geometric Functions

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

---

• Shaders
• Writing Custom Shaders
• Writing Lua Shaders

---

• Main Page
• Lua API
• Main API
• Plugins