step( )

Using step function in RSL as some form of condition operator such as using if .... else...

surface zinTest()
{
float pulseU = (step(0.3,u) - step(0.5,u));
float pulseV = (step(0.3,v) - step(0.5,v));
Oi = Os;
Ci = mix(color(1,0,0),color(0,1,0),(pulseU * pulseV));
}

------------------------------------------------------------------
Ci = mix(color(1,0,0),color(0,1,0),(pulseU + pulseV));

--------------------------------------------------------------------

Ci = mix(color(1,0,0),color(0,1,0),(pulseU - pulseV));

--------------------------------------------------------------------
Ci = mix(color(1,0,0),color(0,1,0),(pulseU * pulseV));

------------------------------------------------------------------
Ci = mix(color(1,0,0),color(0,1,0),(pulseU / pulseV));