heyomidk

float arcRadius = length(p);

// Compute the radial distance field coming out from the center of a torus
const float hw = (RadiusOuter-RadiusInner)*0.5; // half width from center of torus to edge
float radialDF = arcRadius - (RadiusOuter-hw);  // creates a torus
radialDF = abs(radialDF)-hw;                    // give an inside and outside to the torus

// Compute the gradient along the length of the arc
float arcGradient = atan2(p.y,p.x)/6.283185; 
arcGradient = frac(arcGradient*NumDashes);