ShadowMaterial shader: added packing chunk

examples/js/materials/ShadowMaterial.js

@@ -22,6 +22,7 @@ THREE.ShadowMaterial = function () {
 		].join( '\n' ),
 		fragmentShader: [
 			THREE.ShaderChunk[ "common" ],
+			THREE.ShaderChunk[ "packing" ],
 			THREE.ShaderChunk[ "bsdfs" ],
 			THREE.ShaderChunk[ "lights_pars" ],
 			THREE.ShaderChunk[ "shadowmap_pars_fragment" ],