glsl函数之几何函数

glsl函数之几何函数

length

Calculate the length of a vector

float length(float x)
float length(vec2 x)
float length(vec3 x)
float length(vec4 x)

distance

Calculate the distance between two points

float distance(float p0, float p1)
float distance(vec2 p0, vec2 p1)
float distance(vec3 p0, vec3 p1)
float distance(vec4 p0, vec4 p1)

dot

Calculate the dot product of two vectors

float dot(float x, float y)
float dot(vec2 x, vec2 y)
float dot(vec3 x, vec3 y)
float dot(vec4 x, vec4 y)

Description

dot() returns the dot product of two vectors, x and y. i.e., x[0]⋅y[0]+x[1]⋅y[1]+… If x and y are the same the square root of the dot product is equivalent to the length of the vector. The inp