Fix CSG vertex normal calculation.

modules/csg/csg_shape.cpp

@@ -296,20 +296,18 @@ void CSGShape::_update_shape() {
 		int mat = n->faces[i].material;
 		ERR_CONTINUE(mat < -1 || mat >= face_count.size());
 		int idx = mat == -1 ? face_count.size() - 1 : mat;
-		if (n->faces[i].smooth) {
 
-			Plane p(n->faces[i].vertices[0], n->faces[i].vertices[1], n->faces[i].vertices[2]);
+		Plane p(n->faces[i].vertices[0], n->faces[i].vertices[1], n->faces[i].vertices[2]);
 
-			for (int j = 0; j < 3; j++) {
-				Vector3 v = n->faces[i].vertices[j];
-				Vector3 add;
-				if (vec_map.lookup(v, add)) {
-					add += p.normal;
-				} else {
-					add = p.normal;
-				}
-				vec_map.set(v, add);
+		for (int j = 0; j < 3; j++) {
+			Vector3 v = n->faces[i].vertices[j];
+			Vector3 add;
+			if (vec_map.lookup(v, add)) {
+				add += p.normal;
+			} else {
+				add = p.normal;
 			}
+			vec_map.set(v, add);
 		}
 
 		face_count.write[idx]++;