lab/lmapper/shaders/lm_light_shadow.sl

/****************************
Shadowed Spot Light Shader
(c) Mad Processor, 2009

As with all baking-compatible
shaders, one should not use 
the faceforward() call.
*****************************/

light lm_light_shadow(
	float intensity = 1;
	color lightcolor = 1;
	uniform string shadowmap = "";
	uniform float blur = 0;
	point from = point "shader" (0,0,0);
	point to = point "shader" (0,0,1);
	float coneangle = radians(30);
	float conedeltaangle = radians(5);
	float beamdistribution = 2;
	float decay = 2.0; 
	float __nondiffuse = 0, __nonspecular = 0; 
	float samples = 32;
	string __category = "shadow";)
	
{
	uniform vector A = (to - from) / length(to - from);

	illuminate( from, A, coneangle ) 
	{
		//standard shadow
		color shad = shadow( shadowmap, Ps, "blur", blur, "samples",samples );

		//float distance_squared = L.L;
		//float distance = sqrt( distance_squared );

		//float cosangle = L.A / distance;

		//color shad = transmission( Ps, from, "samples", samples, "samplecone", blur, "bias", .08 );
				
		//Cl = atten * (1-shad) * intensity * lightcolor;
		Cl = clamp((1-shad),0,1);
		//Cl = intensity * lightcolor;
	}
}