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// Copyright 2016 The Draco Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#include "draco/mesh/mesh_are_equivalent.h"
#include <sstream>
#include "draco/core/draco_test_base.h"
#include "draco/core/draco_test_utils.h"
#include "draco/io/mesh_io.h"
#include "draco/io/obj_decoder.h"
#include "draco/mesh/mesh.h"
namespace draco {
class MeshAreEquivalentTest : public ::testing::Test {};
TEST_F(MeshAreEquivalentTest, TestOnIndenticalMesh) {
const std::string file_name = "test_nm.obj";
const std::unique_ptr<Mesh> mesh(ReadMeshFromTestFile(file_name));
ASSERT_NE(mesh, nullptr) << "Failed to load test model." << file_name;
MeshAreEquivalent equiv;
ASSERT_TRUE(equiv(*mesh, *mesh));
}
TEST_F(MeshAreEquivalentTest, TestPermutedOneFace) {
const std::string file_name_0 = "one_face_123.obj";
const std::string file_name_1 = "one_face_312.obj";
const std::string file_name_2 = "one_face_321.obj";
const std::unique_ptr<Mesh> mesh_0(ReadMeshFromTestFile(file_name_0));
const std::unique_ptr<Mesh> mesh_1(ReadMeshFromTestFile(file_name_1));
const std::unique_ptr<Mesh> mesh_2(ReadMeshFromTestFile(file_name_2));
ASSERT_NE(mesh_0, nullptr) << "Failed to load test model." << file_name_0;
ASSERT_NE(mesh_1, nullptr) << "Failed to load test model." << file_name_1;
ASSERT_NE(mesh_2, nullptr) << "Failed to load test model." << file_name_2;
MeshAreEquivalent equiv;
ASSERT_TRUE(equiv(*mesh_0, *mesh_0));
ASSERT_TRUE(equiv(*mesh_0, *mesh_1)); // Face rotated.
ASSERT_FALSE(equiv(*mesh_0, *mesh_2)); // Face inverted.
}
TEST_F(MeshAreEquivalentTest, TestPermutedTwoFaces) {
const std::string file_name_0 = "two_faces_123.obj";
const std::string file_name_1 = "two_faces_312.obj";
const std::unique_ptr<Mesh> mesh_0(ReadMeshFromTestFile(file_name_0));
const std::unique_ptr<Mesh> mesh_1(ReadMeshFromTestFile(file_name_1));
ASSERT_NE(mesh_0, nullptr) << "Failed to load test model." << file_name_0;
ASSERT_NE(mesh_1, nullptr) << "Failed to load test model." << file_name_1;
MeshAreEquivalent equiv;
ASSERT_TRUE(equiv(*mesh_0, *mesh_0));
ASSERT_TRUE(equiv(*mesh_1, *mesh_1));
ASSERT_TRUE(equiv(*mesh_0, *mesh_1));
}
//
TEST_F(MeshAreEquivalentTest, TestPermutedThreeFaces) {
const std::string file_name_0 = "three_faces_123.obj";
const std::string file_name_1 = "three_faces_312.obj";
const std::unique_ptr<Mesh> mesh_0(ReadMeshFromTestFile(file_name_0));
const std::unique_ptr<Mesh> mesh_1(ReadMeshFromTestFile(file_name_1));
ASSERT_NE(mesh_0, nullptr) << "Failed to load test model." << file_name_0;
ASSERT_NE(mesh_1, nullptr) << "Failed to load test model." << file_name_1;
MeshAreEquivalent equiv;
ASSERT_TRUE(equiv(*mesh_0, *mesh_0));
ASSERT_TRUE(equiv(*mesh_1, *mesh_1));
ASSERT_TRUE(equiv(*mesh_0, *mesh_1));
}
// This test checks that the edgebreaker algorithm does not change the mesh up
// to the order of faces and vertices.
TEST_F(MeshAreEquivalentTest, TestOnBigMesh) {
const std::string file_name = "test_nm.obj";
const std::unique_ptr<Mesh> mesh0(ReadMeshFromTestFile(file_name));
ASSERT_NE(mesh0, nullptr) << "Failed to load test model." << file_name;
std::unique_ptr<Mesh> mesh1;
std::stringstream ss;
WriteMeshIntoStream(mesh0.get(), ss, MESH_EDGEBREAKER_ENCODING);
ReadMeshFromStream(&mesh1, ss);
ASSERT_TRUE(ss.good()) << "Mesh IO failed.";
MeshAreEquivalent equiv;
ASSERT_TRUE(equiv(*mesh0, *mesh0));
ASSERT_TRUE(equiv(*mesh1, *mesh1));
ASSERT_TRUE(equiv(*mesh0, *mesh1));
}
} // namespace draco
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