Truchet Tentacles

DistanceFunction.shader

// original code: https://www.shadertoy.com/view/ldfGWn

inline float rand(float3 r) 
{ 
    return frac(sin(dot(r.xy, r.yz)));
}

inline float truchetarc(float3 pos)
{
    float p = 4.0 + 2.0 * _SinTime.w;
    float r = length(pos.xy);
    float t = 0.12 + 0.02 * _SinTime.w;
    return pow(
        pow(abs(r - 0.5), p) + pow(abs(pos.z - 0.5), p), 
        rcp(p)
    ) - t;
}

inline float truchetcell(float3 pos)
{
    return min(min(
        truchetarc(pos),
        truchetarc(float3(pos.z, 1.0 - pos.x, pos.y))), 
        truchetarc(float3(1.0 - pos.y, 1.0 - pos.z, pos.x)));
}

inline float map(float3 pos)
{
    float3 c = frac(pos);
    float  r = rand(floor(pos));

    if      (r < 0.125) return truchetcell(float3(c.x, c.y, c.z));
    else if (r < 0.250) return truchetcell(float3(c.x, 1.0 - c.y, c.z));
    else if (r < 0.375) return truchetcell(float3(1.0 - c.x, c.y, c.z));
    else if (r < 0.500) return truchetcell(float3(1.0 - c.x, 1.0 - c.y, c.z));
    else if (r < 0.625) return truchetcell(float3(c.y, c.x, c.z));
    else if (r < 0.750) return truchetcell(float3(c.y, 1.0 - c.x, c.z));
    else if (r < 0.875) return truchetcell(float3(1.0 - c.y, c.x, c.z));
    else                return truchetcell(float3(1.0 - c.y, 1.0 - c.x, c.z));
}


inline float DistanceFunction(float3 pos)
{
    return map(pos);
}

PostEffect.shader

inline void PostEffect(RaymarchInfo ray, inout PostEffectOutput o)
{
    o.Albedo = 0.5 + 0.5 * normalize(ray.endPos);
}