TEST(TriangleMesh3, ClosestDistance) {
std::string objStr = getCubeTriMesh3x3x3Obj();
std::istringstream objStream(objStr);
TriangleMesh3 mesh;
mesh.readObj(&objStream);
const auto bruteForceSearch = [&](const Vector3D& pt) {
double minDist = kMaxD;
for (size_t i = 0; i < mesh.numberOfTriangles(); ++i) {
Triangle3 tri = mesh.triangle(i);
auto localResult = tri.closestDistance(pt);
if (localResult < minDist) {
minDist = localResult;
}
}
return minDist;
};
size_t numSamples = getNumberOfSamplePoints3();
for (size_t i = 0; i < numSamples; ++i) {
auto actual = mesh.closestDistance(getSamplePoints3()[i]);
auto expected = bruteForceSearch(getSamplePoints3()[i]);
EXPECT_DOUBLE_EQ(expected, actual);
}
}
TEST(TriangleMesh3, ClosestNormal) {
std::string objStr = getSphereTriMesh5x5Obj();
std::istringstream objStream(objStr);
TriangleMesh3 mesh;
mesh.readObj(&objStream);
const auto bruteForceSearch = [&](const Vector3D& pt) {
double minDist2 = kMaxD;
Vector3D result;
for (size_t i = 0; i < mesh.numberOfTriangles(); ++i) {
Triangle3 tri = mesh.triangle(i);
auto localResult = tri.closestNormal(pt);
auto closestPt = tri.closestPoint(pt);
double localDist2 = pt.distanceSquaredTo(closestPt);
if (localDist2 < minDist2) {
minDist2 = localDist2;
result = localResult;
}
}
return result;
};
size_t numSamples = getNumberOfSamplePoints3();
for (size_t i = 0; i < numSamples; ++i) {
auto actual = mesh.closestNormal(getSamplePoints3()[i]);
auto expected = bruteForceSearch(getSamplePoints3()[i]);
EXPECT_VECTOR3_NEAR(expected, actual, 1e-9);
}
}
TEST(TriangleMesh3, ClosestIntersection) {
std::string objStr = getCubeTriMesh3x3x3Obj();
std::istringstream objStream(objStr);
TriangleMesh3 mesh;
mesh.readObj(&objStream);
size_t numSamples = getNumberOfSamplePoints3();
const auto bruteForceTest = [&](const Ray3D& ray) {
SurfaceRayIntersection3 result{};
for (size_t i = 0; i < mesh.numberOfTriangles(); ++i) {
Triangle3 tri = mesh.triangle(i);
auto localResult = tri.closestIntersection(ray);
if (localResult.distance < result.distance) {
result = localResult;
}
}
return result;
};
for (size_t i = 0; i < numSamples; ++i) {
Ray3D ray(getSamplePoints3()[i], getSampleDirs3()[i]);
auto actual = mesh.closestIntersection(ray);
auto expected = bruteForceTest(ray);
EXPECT_DOUBLE_EQ(expected.distance, actual.distance);
EXPECT_VECTOR3_EQ(expected.point, actual.point);
EXPECT_VECTOR3_EQ(expected.normal, actual.normal);
EXPECT_EQ(expected.isIntersecting, actual.isIntersecting);
}
}
TEST(TriangleMesh3, Intersects) {
std::string objStr = getCubeTriMesh3x3x3Obj();
std::istringstream objStream(objStr);
TriangleMesh3 mesh;
mesh.readObj(&objStream);
size_t numSamples = getNumberOfSamplePoints3();
const auto bruteForceTest = [&](const Ray3D& ray) {
for (size_t i = 0; i < mesh.numberOfTriangles(); ++i) {
Triangle3 tri = mesh.triangle(i);
if (tri.intersects(ray)) {
return true;
}
}
return false;
};
for (size_t i = 0; i < numSamples; ++i) {
Ray3D ray(getSamplePoints3()[i], getSampleDirs3()[i]);
bool actual = mesh.intersects(ray);
bool expected = bruteForceTest(ray);
EXPECT_EQ(expected, actual);
}
}
TEST(TriangleMesh3, ReadObj) {
std::string objStr = getCubeTriMesh3x3x3Obj();
std::istringstream objStream(objStr);
TriangleMesh3 mesh;
mesh.readObj(&objStream);
EXPECT_EQ(56u, mesh.numberOfPoints());
EXPECT_EQ(96u, mesh.numberOfNormals());
EXPECT_EQ(76u, mesh.numberOfUvs());
EXPECT_EQ(108u, mesh.numberOfTriangles());
}
TEST(TriangleMesh3, Builder) {
TriangleMesh3::PointArray points = {
Vector3D(1, 2, 3),
Vector3D(4, 5, 6),
Vector3D(7, 8, 9),
Vector3D(10, 11, 12)
};
TriangleMesh3::NormalArray normals = {
Vector3D(10, 11, 12),
Vector3D(7, 8, 9),
Vector3D(4, 5, 6),
Vector3D(1, 2, 3)
};
TriangleMesh3::UvArray uvs = {
Vector2D(13, 14),
Vector2D(15, 16)
};
TriangleMesh3::IndexArray pointIndices = {
Point3UI(0, 1, 2),
Point3UI(0, 1, 3)
};
TriangleMesh3::IndexArray normalIndices = {
Point3UI(1, 2, 3),
Point3UI(2, 1, 0)
};
TriangleMesh3::IndexArray uvIndices = {
Point3UI(1, 0, 2),
Point3UI(3, 1, 0)
};
TriangleMesh3 mesh = TriangleMesh3::builder()
.withPoints(points)
.withNormals(normals)
.withUvs(uvs)
.withPointIndices(pointIndices)
.withNormalIndices(normalIndices)
.withUvIndices(uvIndices)
.build();
EXPECT_EQ(4u, mesh.numberOfPoints());
EXPECT_EQ(4u, mesh.numberOfNormals());
EXPECT_EQ(2u, mesh.numberOfUvs());
EXPECT_EQ(2u, mesh.numberOfTriangles());
for (size_t i = 0; i < mesh.numberOfPoints(); ++i) {
EXPECT_EQ(points[i], mesh.point(i));
}
for (size_t i = 0; i < mesh.numberOfNormals(); ++i) {
EXPECT_EQ(normals[i], mesh.normal(i));
}
for (size_t i = 0; i < mesh.numberOfUvs(); ++i) {
EXPECT_EQ(uvs[i], mesh.uv(i));
}
for (size_t i = 0; i < mesh.numberOfTriangles(); ++i) {
EXPECT_EQ(pointIndices[i], mesh.pointIndex(i));
EXPECT_EQ(normalIndices[i], mesh.normalIndex(i));
EXPECT_EQ(uvIndices[i], mesh.uvIndex(i));
}
}