/* Shader description goes here */
surface
wgsTreeRadial(float	Kfb = 1,	/* fake brightness */
				outer = 13,
				inner = 8.0;
	point		center = point (0.0, 0.0, 0.0);
	color		outercolor = color(0,1,0),
				innercolor = color(1,0,0))
				//now use a custom coordinate system witha  3dplace node in Maya
{
color	surfcolor = 1;
point pnt;

//float success = attribute("user:position", data);

if(attribute("user:position", pnt)) {
 float dist = distance(transform("tree", center),
					   transform("tree" ,pnt)) ;

//printf("%1.3f\n", dist); 
	//% reserver a space in the string
	//1 means 
	//3 3 decimanl places
float blend = smoothstep(inner, outer, dist);
surfcolor = mix(innercolor, outercolor, blend);

}
/* STEP 1 - set the apparent surface opacity */
Oi = Os;

/* STEP 2 - calculate the apparent surface color */
Ci = Oi * Cs * surfcolor * Kfb;
}