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/*
Copyright 2018 Google Inc. All Rights Reserved.
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 "geometrical_acoustics/scene_manager.h"
#include <functional>
#include <random>
#include <vector>
#include "third_party/googletest/googletest/include/gtest/gtest.h"
#include "Eigen/Core"
#include "geometrical_acoustics/acoustic_listener.h"
#include "geometrical_acoustics/acoustic_ray.h"
#include "geometrical_acoustics/reflection_kernel.h"
#include "geometrical_acoustics/test_util.h"
namespace vraudio {
namespace {
using Eigen::Vector3f;
class SceneManagerTest : public testing::Test {
public:
SceneManagerTest() : random_engine_(0), distribution_(0.0f, 1.0f) {}
void SetUp() override {
ground_vertices_ = {{0.0f, 0.0f, 0.0f},
{0.0f, 1.0f, 0.0f},
{1.0f, 0.0f, 0.0f},
{1.0f, 1.0f, 0.0f}};
ground_triangles_ = {{0, 2, 1}, {1, 2, 3}};
// Reseed the random number generator for every test to be deterministic
// and remove flakiness in tests.
random_engine_.seed(0);
random_number_generator_ = [this] { return distribution_(random_engine_); };
}
protected:
const std::array<float, kNumReverbOctaveBands> kUnitEnergies{
{1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f}};
const std::array<float, kNumReverbOctaveBands> kZeroAbsorptionCoefficients{
{0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f}};
std::vector<Vertex> ground_vertices_;
std::vector<Triangle> ground_triangles_;
SceneManager scene_manager_;
std::default_random_engine random_engine_;
std::uniform_real_distribution<float> distribution_;
std::function<float()> random_number_generator_;
};
TEST_F(SceneManagerTest, UncommittedSceneTest) {
EXPECT_FALSE(scene_manager_.is_scene_committed());
EXPECT_FALSE(scene_manager_.is_listener_scene_committed());
}
TEST_F(SceneManagerTest, BuildEmptySceneTest) {
scene_manager_.BuildScene({}, {});
EXPECT_TRUE(scene_manager_.is_scene_committed());
EXPECT_EQ(scene_manager_.num_vertices(), 0U);
EXPECT_EQ(scene_manager_.num_triangles(), 0U);
}
TEST_F(SceneManagerTest, BuildSceneWithTwoTrianglesTest) {
scene_manager_.BuildScene(ground_vertices_, ground_triangles_);
EXPECT_TRUE(scene_manager_.is_scene_committed());
EXPECT_EQ(scene_manager_.num_vertices(), 4U);
EXPECT_EQ(scene_manager_.num_triangles(), 2U);
}
TEST_F(SceneManagerTest, ReturnDefaultReflectionIfNotAssociatedTest) {
scene_manager_.BuildScene(ground_vertices_, ground_triangles_);
// Get a reflection of triangle 0; since nothing has been associated to it,
// a default reflection is returned.
const ReflectionKernel& reflection =
scene_manager_.GetAssociatedReflectionKernel(0);
// Test that this default reflection absorbs all energy.
AcousticRay ray(Vector3f(0.0f, 0.0f, 0.0f).data(),
Vector3f(1.0f, 0.0f, 0.0f).data(), 0.0f, 1.0f, kUnitEnergies,
AcousticRay::RayType::kSpecular, 0.0f);
AcousticRay reflected_ray = reflection.Reflect(ray);
for (size_t i = 0; i < kNumReverbOctaveBands; ++i) {
EXPECT_FLOAT_EQ(reflected_ray.energies().at(i), 0.0f);
}
}
TEST_F(SceneManagerTest, ReturnFalseAssociatingToNonExistentTriangleTest) {
scene_manager_.BuildScene(ground_vertices_, ground_triangles_);
// A non-absorptive, purely specular reflection.
ReflectionKernel reflection(kZeroAbsorptionCoefficients, 0.0f,
random_number_generator_);
// Associate the reflection to triangle 2, which does not exist.
EXPECT_FALSE(
scene_manager_.AssociateReflectionKernelToTriangles(reflection, {2}));
}
TEST_F(SceneManagerTest, ReturnAssociatedReflectionsTest) {
scene_manager_.BuildScene(ground_vertices_, ground_triangles_);
// A half-absorptive, purely diffuse reflection.
std::array<float, kNumReverbOctaveBands> absorption_coefficients;
absorption_coefficients.fill(0.5f);
ReflectionKernel reflection_1(absorption_coefficients, 1.0f,
random_number_generator_);
// A non-absorptive, purely specular reflection.
ReflectionKernel reflection_2(kZeroAbsorptionCoefficients, 0.0f,
random_number_generator_);
// Associate them to triangle 1 and 0 respectively.
EXPECT_TRUE(
scene_manager_.AssociateReflectionKernelToTriangles(reflection_1, {1}));
EXPECT_TRUE(
scene_manager_.AssociateReflectionKernelToTriangles(reflection_2, {0}));
AcousticRay ray(Vector3f(0.0f, 0.0f, 0.0f).data(),
Vector3f(1.0f, 0.0f, 0.0f).data(), 0.0f, 1.0f, kUnitEnergies,
AcousticRay::RayType::kSpecular, 0.0f);
{
// Test that the reflection from triangle 0, which should be |reflection_2|,
// absorbs none of the energy and reflects specularly.
const ReflectionKernel& reflection =
scene_manager_.GetAssociatedReflectionKernel(0);
AcousticRay reflected_ray = reflection.Reflect(ray);
for (size_t i = 0; i < kNumReverbOctaveBands; ++i) {
EXPECT_FLOAT_EQ(reflected_ray.energies().at(i), 1.0f);
}
EXPECT_EQ(reflected_ray.type(), AcousticRay::RayType::kSpecular);
}
{
// Test that the reflection from triangle 1, which should be |reflection_1|,
// absorbs half of the energy and reflects diffusely.
const ReflectionKernel& reflection =
scene_manager_.GetAssociatedReflectionKernel(1);
AcousticRay reflected_ray = reflection.Reflect(ray);
for (size_t i = 0; i < kNumReverbOctaveBands; ++i) {
EXPECT_FLOAT_EQ(reflected_ray.energies().at(i), 0.5f);
}
EXPECT_EQ(reflected_ray.type(), AcousticRay::RayType::kDiffuse);
}
}
TEST_F(SceneManagerTest, BuildEmptyListenerSceneTest) {
const float listener_sphere_radius = 0.1f;
scene_manager_.BuildListenerScene({}, listener_sphere_radius);
EXPECT_TRUE(scene_manager_.is_listener_scene_committed());
}
TEST_F(SceneManagerTest, RayIntersectListenerSceneTest) {
// Five AcousticListeners, lining up on the x-axis, with positions (i, 0, 0).
std::vector<AcousticListener> listeners;
const size_t impulse_response_length = 1000;
for (size_t i = 0; i < 5; ++i) {
const Vector3f listener_position(static_cast<float>(i), 0.0f, 0.0f);
listeners.emplace_back(listener_position, impulse_response_length);
}
// Build the scene.
const float listener_sphere_radius = 0.1f;
scene_manager_.BuildListenerScene(listeners, listener_sphere_radius);
EXPECT_TRUE(scene_manager_.is_listener_scene_committed());
// Shoot 5 rays from (i, -1, 0), all with direction (0, 1, 0). Ray i is
// expected to intersect with listener i's sphere.
const float direction[3] = {0.0f, 1.0f, 0.0f};
for (size_t i = 0; i < 5; ++i) {
const float origin[3] = {static_cast<float>(i), -1.0f, 0.0f};
AcousticRay ray_i(origin, direction, 0.0f /* t_near */,
AcousticRay::kInfinity /* t_far */, kUnitEnergies,
AcousticRay::RayType::kDiffuse,
0.0f /* prior_distance */);
// Verify that |ray_i| intersects with listener i's sphere.
EXPECT_TRUE(ray_i.Intersect(scene_manager_.listener_scene()));
const unsigned int intersected_sphere_id = ray_i.intersected_geometry_id();
EXPECT_EQ(
scene_manager_.GetListenerIndexFromSphereId(intersected_sphere_id), i);
}
}
} // namespace
} // namespace vraudio
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