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;
}