lygia/sdf/starSDF)Returns a star-shaped sdf with V branches
Dependencies:
Use:
starSDF(<vec2> st, <int> V, <float> scale)
#ifndef FNC_STARSDF
#define FNC_STARSDF
float starSDF(in vec2 st, in int V, in float s) {
#ifdef CENTER_2D
st -= CENTER_2D;
#else
st -= 0.5;
#endif
st *= 2.0;
float a = atan(st.y, st.x) / TAU;
float seg = a * float(V);
a = ((floor(seg) + 0.5) / float(V) +
mix(s, -s, step(0.5, fract(seg))))
* TAU;
return abs(dot(vec2(cos(a), sin(a)),
st));
}
float starSDF(in vec2 st, in int V) {
return starSDF( scale(st, 12.0/float(V)), V, 0.1);
}
#endif
Dependencies:
Use:
starSDF(<float2> st, <int> V, <float> scale)
#ifndef FNC_STARSDF
#define FNC_STARSDF
float starSDF(in float2 st, in int V, in float s) {
#ifdef CENTER_2D
st -= CENTER_2D;
#else
st -= 0.5;
#endif
st *= 2.0;
float a = atan2(st.y, st.x) / TAU;
float seg = a * float(V);
a = ((floor(seg) + 0.5) / float(V) +
lerp(s, -s, step(0.5, frac(seg))))
* TAU;
return abs(dot(float2(cos(a), sin(a)),
st));
}
float starSDF(in float2 st, in int V) {
return starSDF( scale(st, 12.0/float(V)), V, 0.1);
}
#endif
Dependencies:
Use:
starSDF(<float2> st, <int> V, <float> scale)
#ifndef FNC_STARSDF
#define FNC_STARSDF
float starSDF(float2 st, int V, float s) {
#ifdef CENTER_2D
st -= CENTER_2D;
#else
st -= 0.5;
#endif
st *= 2.0;
float a = atan(st.y, st.x) / TAU;
float seg = a * float(V);
a = ((floor(seg) + 0.5) / float(V) +
mix(s, -s, step(0.5, fract(seg))))
* TAU;
return abs(dot(float2(cos(a), sin(a)),
st));
}
float starSDF(float2 st, int V) {
return starSDF( scale(st, 12.0/float(V)), V, 0.1);
}
#endif
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