k3d/share/shaders/k3d_luna.sl:56:  float lighten;
k3d/share/shaders/k3d_luna.sl:103:  lighten = 0;
k3d/share/shaders/k3d_luna.sl:107:/*      lighten = uu*uu; */
k3d/share/shaders/k3d_luna.sl:117:      lighten = .75 * uu;
k3d/share/shaders/k3d_luna.sl:123:      lighten = .75 * uu * uu;
k3d/share/shaders/k3d_luna.sl:129:  lighten *= 0.2;
k3d/share/shaders/k3d_luna.sl:130:  Ct += color(lighten, lighten, lighten);
k3d/share/shaders/k3d_luna.sl:171:  lighten = 0;
k3d/share/shaders/k3d_luna.sl:174:      lighten = smoothstep(.15, .5, snoise(62 * u));
k3d/share/shaders/k3d_luna.sl:176:      lighten *= (1 - smoothstep(raydist - .2, raydist, pd));
k3d/share/shaders/k3d_luna.sl:178:  lighten = 0.2 * clamp(lighten, 0, 1);
k3d/share/shaders/k3d_luna.sl:179:  Ct += color(lighten, lighten, lighten);
k3d/share/shaders/k3d_slateroof.sl:78:	float 	colorvary = 0,				    	/* the random amount by which a tile is lightened or darkened */
