lygia/v1.1.4/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) {
st = st * 4. - 2.;
float a = atan(st.y, st.x) / TAU;
float seg = a * float(V);
a = ((floor(seg) + .5) / float(V) +
mix(s, -s, step(.5, fract(seg))))
* TAU;
return abs(dot(vec2(cos(a), sin(a)),
st));
}
#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) {
st = st * 4. - 2.;
float a = atan2(st.y, st.x) / TAU;
float seg = a * float(V);
a = ((floor(seg) + .5) / float(V) +
lerp(s, -s, step(.5, frac(seg))))
* TAU;
return abs(dot(float2(cos(a), sin(a)),
st));
}
#endif
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