lygia/sdf/polySDF)Returns a sdf for a regular polygon with V sides.
Dependencies:
Use:
polySDF(<vec2> st, int V)
#ifndef FNC_POLYSDF
#define FNC_POLYSDF
float polySDF(in vec2 st, in int V) {
#ifdef CENTER_2D
st -= CENTER_2D;
st *= 2.0;
#else
st = st * 2.0 - 1.0;
#endif
float a = atan(st.x, st.y) + PI;
float r = length(st);
float v = TAU / float(V);
return cos(floor(.5 + a / v) * v - a ) * r;
}
#endif
Dependencies:
Use:
polySDF(<float2> st, int V)
#ifndef FNC_POLYSDF
#define FNC_POLYSDF
float polySDF(in float2 st, in int V) {
#ifdef CENTER_2D
st -= CENTER_2D;
st *= 2.0;
#else
st = st * 2.0 - 1.0;
#endif
float a = atan2(st.x, st.y) + PI;
float r = length(st);
float v = TAU / float(V);
return cos(floor(.5 + a / v) * v - a ) * r;
}
#endif
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