Merge pull request #59039 from MythTitans/fix-smoothed-normals-computation

Fix mixed smoothed and non-smoothed face normals computation for CSG shapes

modules/csg/csg_shape.cpp

@@ -303,6 +303,7 @@ void CSGShape3D::_update_shape() {
 		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]);
 
 			for (int j = 0; j < 3; j++) {
@@ -315,6 +316,7 @@ void CSGShape3D::_update_shape() {
 				}
 				vec_map.set(v, add);
 			}
+		}
 
 		face_count.write[idx]++;
 	}