ImplicitSurfaceNetwork/surface_integral/test/test_mesh.cpp

#include <iostream>
#include <mesh_algorithm.hpp>

int main()
{
    // 8 vertices: unit cube
    vector3d verts[8] = {
        {0, 0, 0},
        {1, 0, 0},
        {1, 1, 0},
        {0, 1, 0},
        {0, 0, 1},
        {1, 0, 1},
        {1, 1, 1},
        {0, 1, 1}
    };

    // 6 faces, each with 4 vertices (counter-clockwise order when viewed from outside)
    uint32_t face_data[] = {
        0, 1, 2, 3, // bottom face
        7, 6, 5, 4, // top face (note CCW when seen from outside)
        0, 4, 5, 1, // front face
        1, 5, 6, 2, // right face
        3, 2, 6, 7, // back face
        0, 3, 7, 4  // left face
    };

    uint32_t vertex_counts[6] = {4, 4, 4, 4, 4, 4};

    polymesh_t mesh;
    mesh.vertices      = verts;
    mesh.faces         = face_data;
    mesh.vertex_counts = vertex_counts;
    mesh.num_vertices  = 8;
    mesh.num_faces     = 6;

    double area   = compute_surface_area(&mesh);
    double volume = compute_volume(&mesh);

    std::cout << "area: " << area << std::endl;     // expected: 6
    std::cout << "volume: " << volume << std::endl; // expected: 1

    return 0;
}