LYGIA Shader Library

spiralSDF (lygia/v1.1.6/sdf/spiralSDF)

Returns a spiral SDF

Use:

spiralSDF(<vec2> st, <float> turns)

Check it on Github


#ifndef FNC_SPIRALSDF
#define FNC_SPIRALSDF
float spiralSDF(vec2 st, float t) {
#ifdef CENTER_2D
    st -= CENTER_2D;
#else
    st -= 0.5;
#endif
    float r = dot(st, st);
    float a = atan(st.y, st.x);
    return abs(sin(fract(log(r) * t + a * 0.159)));
}
#endif

Use:

spiralSDF(<float2> st, <float> turns)

Check it on Github


#ifndef FNC_SPIRALSDF
#define FNC_SPIRALSDF
float spiralSDF(float2 st, float t) {
#ifdef CENTER_2D
    st -= CENTER_2D;
#else
    st -= 0.5;
#endif
    float r = dot(st, st);
    float a = atan2(st.y, st.x);
    return abs(sin(frac(log(r) * t + a * 0.159)));
}
#endif

Examples

LYGIA is dual-licensed under the Prosperity License and the Patron License for sponsors and contributors.

Sponsors and contributors are automatically added to the Patron License and they can ignore the any non-commercial rule of the Prosperity Licensed software (please take a look to the exception).

It's also possible to get a permanent comercial license hook to a single and specific version of LYGIA.

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