1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
|
// -----------------------------------------------------------------------------
// Copyright (c) 2014, Nicolas P. Rougier. All Rights Reserved.
// Distributed under the (new) BSD License.
// -----------------------------------------------------------------------------
#include "math/constants.glsl"
float marker_clover(vec2 P, float size)
{
const float t1 = -M_PI/2;
const vec2 c1 = 0.25*vec2(cos(t1),sin(t1));
const float t2 = t1+2*M_PI/3;
const vec2 c2 = 0.25*vec2(cos(t2),sin(t2));
const float t3 = t2+2*M_PI/3;
const vec2 c3 = 0.25*vec2(cos(t3),sin(t3));
float r1 = length( P - c1*size) - size/3.5;
float r2 = length( P - c2*size) - size/3.5;
float r3 = length( P - c3*size) - size/3.5;
return min(min(r1,r2),r3);
}
|
