restore initial projection matrix update

src/renderers/webgl/WebGLShadowMap.js

@@ -140,6 +140,8 @@ function WebGLShadowMap( _renderer, _objects, maxTextureSize ) {
 				shadow.map = new WebGLRenderTarget( _shadowMapSize.x, _shadowMapSize.y, pars );
 				shadow.map.texture.name = light.name + ".shadowMap";
 
+				shadow.camera.updateProjectionMatrix();
+
 			}
 
 			_renderer.setRenderTarget( shadow.map );