22 lines
559 B
GLSL
22 lines
559 B
GLSL
#include "../math/saturate.glsl"
|
|
|
|
/*
|
|
contributors: Inigo Quiles
|
|
description: Segment SDF
|
|
use: lineSDF(<vec2> st, <vec2> A, <vec2> B)
|
|
*/
|
|
|
|
#ifndef FNC_LINESDF
|
|
#define FNC_LINESDF
|
|
float lineSDF( in vec2 st, in vec2 a, in vec2 b ) {
|
|
vec2 b_to_a = b - a;
|
|
vec2 to_a = st - a;
|
|
float h = saturate(dot(to_a, b_to_a)/dot(b_to_a, b_to_a));
|
|
return length(to_a - h * b_to_a );
|
|
}
|
|
|
|
float lineSDF(vec3 p, vec3 a, vec3 b) {
|
|
//https://mathworld.wolfram.com/Point-LineDistance3-Dimensional.html
|
|
return length(cross(p - a, p - b))/length(b - a);
|
|
}
|
|
#endif
|