Padding.osl

shader
Padding(float freq1 = 10,
        float freq2 = 10,
        float maxB = .25,
            color minColor = color(0,0,0),
            color maxColor = color(1,1,1),
            float s = 0 [[int lockgeom = 0]],
            float t = 0 [[int lockgeom = 0]],
        output color resultRGB1 = 0,
        output color resultRGB2 = 0,
        output color resultRGB3 = 0)

{
float  sinval = sin(s * 2 * M_PI * freq1);

// Remap from -1 to +1 to 0 to 1
float alpha = (sinval + 1) * .5;
resultRGB1 = mix(minColor, maxColor, alpha);

point p = transform("world", P);
float blend = smoothstep(freq1, freq2, p[1]);
resultRGB2 = mix(minColor, resultRGB1, blend);

// float blend2 = smoothstep(freq1, freq2, s);
resultRGB3 = mix(sinval, resultRGB2, blend);
}