float dist = (length(normalized_pos) - PREFIX(inner_radius)) * PREFIX(pihalf_div_radius);
float linear_falloff = clamp(dist, 0.0, pihalf);
float falloff = cos(linear_falloff) * cos(linear_falloff);
float dist = (length(normalized_pos) - PREFIX(inner_radius)) * PREFIX(pihalf_div_radius);
float linear_falloff = clamp(dist, 0.0, pihalf);
float falloff = cos(linear_falloff) * cos(linear_falloff);