void write_mesh(FILE *o, Lib3dsFile *f, Lib3dsMeshInstanceNode *node) {
float (*orig_vertices)[3];
int export_texcos;
int export_normals;
int i, j;
Lib3dsMesh *mesh;
mesh = lib3ds_file_mesh_for_node(f, (Lib3dsNode*)node);
if (!mesh || !mesh->vertices) return;
fprintf(o, "# object %s\n", node->base.name);
fprintf(o, "g %s\n", node->instance_name[0]? node->instance_name : node->base.name);
orig_vertices = (float(*)[3])malloc(sizeof(float) * 3 * mesh->nvertices);
memcpy(orig_vertices, mesh->vertices, sizeof(float) * 3 * mesh->nvertices);
{
float inv_matrix[4][4], M[4][4];
float tmp[3];
int i;
lib3ds_matrix_copy(M, node->base.matrix);
lib3ds_matrix_translate(M, -node->pivot[0], -node->pivot[1], -node->pivot[2]);
lib3ds_matrix_copy(inv_matrix, mesh->matrix);
lib3ds_matrix_inv(inv_matrix);
lib3ds_matrix_mult(M, M, inv_matrix);
for (i = 0; i < mesh->nvertices; ++i) {
lib3ds_vector_transform(tmp, M, mesh->vertices[i]);
lib3ds_vector_copy(mesh->vertices[i], tmp);
}
}
export_texcos = (mesh->texcos != 0);
export_normals = (mesh->faces != 0);
for (i = 0; i < mesh->nvertices; ++i) {
fprintf(o, "v %f %f %f\n", mesh->vertices[i][0],
mesh->vertices[i][1],
mesh->vertices[i][2]);
}
fprintf(o, "# %d vertices\n", mesh->nvertices);
if (export_texcos) {
for (i = 0; i < mesh->nvertices; ++i) {
fprintf(o, "vt %f %f\n", mesh->texcos[i][0],
mesh->texcos[i][1]);
}
fprintf(o, "# %d texture vertices\n", mesh->nvertices);
}
if (export_normals) {
float (*normals)[3] = (float(*)[3])malloc(sizeof(float) * 9 * mesh->nfaces);
lib3ds_mesh_calculate_vertex_normals(mesh, normals);
for (i = 0; i < 3 * mesh->nfaces; ++i) {
fprintf(o, "vn %f %f %f\n", normals[i][0],
normals[i][1],
normals[i][2]);
}
free(normals);
fprintf(o, "# %d normals\n", 3 * mesh->nfaces);
}
{
int mat_index = -1;
for (i = 0; i < mesh->nfaces; ++i) {
if (mat_index != mesh->faces[i].material) {
mat_index = mesh->faces[i].material;
if (mat_index != -1) {
fprintf(o, "usemtl %s\n", f->materials[mat_index]->name);
}
}
fprintf(o, "f ");
for (j = 0; j < 3; ++j) {
fprintf(o, "%d", mesh->faces[i].index[j] + max_vertices + 1);
if (export_texcos) {
fprintf(o, "/%d", mesh->faces[i].index[j] + max_texcos + 1);
} else if (export_normals) {
fprintf(o, "/");
}
if (export_normals) {
fprintf(o, "/%d", 3 * i + j + max_normals + 1);
}
if (j < 3) {
fprintf(o, " ");
}
}
fprintf(o, "\n");
}
}
max_vertices += mesh->nvertices;
if (export_texcos)
max_texcos += mesh->nvertices;
if (export_normals)
max_normals += 3 * mesh->nfaces;
memcpy(mesh->vertices, orig_vertices, sizeof(float) * 3 * mesh->nvertices);
free(orig_vertices);
}
std::vector<CL_Lib3dsMesh> CL_Lib3dsFile::export_meshes(Lib3dsNode *node)
{
if (node == 0)
{
lib3ds_file_eval(file, 0.0f);
node = file->nodes;
}
std::vector<CL_Lib3dsMesh> meshes;
for (; node; node = node->next)
{
if (node->type == LIB3DS_NODE_MESH_INSTANCE)
{
Lib3dsMeshInstanceNode *instance_node = (Lib3dsMeshInstanceNode *) node;
Lib3dsMesh *mesh = lib3ds_file_mesh_for_node(file, (Lib3dsNode*)node);
if (mesh && mesh->vertices)
{
float inv_matrix[4][4], M[4][4];
lib3ds_matrix_copy(M, instance_node->base.matrix);
lib3ds_matrix_translate(M, -instance_node->pivot[0], -instance_node->pivot[1], -instance_node->pivot[2]);
lib3ds_matrix_copy(inv_matrix, mesh->matrix);
lib3ds_matrix_inv(inv_matrix);
lib3ds_matrix_mult(M, M, inv_matrix);
std::vector<CL_Vec3f> positions;
for (int i = 0; i < mesh->nvertices; ++i)
{
float position[3];
lib3ds_vector_transform(position, M, mesh->vertices[i]);
positions.push_back(CL_Vec3f(position[0], position[1], position[2]));
}
std::vector<CL_Vec2f> texcoords;
if (mesh->texcos)
{
for (int i = 0; i < mesh->nvertices; ++i)
{
float tx = mesh->texcos[i][0];
float ty = mesh->texcos[i][1];
texcoords.push_back(CL_Vec2f(tx, ty));
}
}
std::vector<CL_Vec3f> normals;
if (mesh->faces && mesh->nfaces > 0)
{
float (*normals_array)[3] = (float(*)[3])malloc(sizeof(float) * 9 * mesh->nfaces);
lib3ds_mesh_calculate_vertex_normals(mesh, normals_array);
for (int i = 0; i < 3 * mesh->nfaces; ++i)
{
normals.push_back(CL_Vec3f(normals_array[i][0], normals_array[i][1], normals_array[i][2]));
}
free(normals_array);
}
CL_Lib3dsMesh mesh_object;
for (int i = 0; i < mesh->nfaces; ++i)
{
int material_index = mesh->faces[i].material;
mesh_object.face_materials.push_back(material_index);
for (int j = 0; j < 3; ++j)
{
int vertex_index = mesh->faces[i].index[j];
mesh_object.positions.push_back(positions[vertex_index]);
if (!texcoords.empty())
mesh_object.texcooords.push_back(texcoords[vertex_index]);
if (!normals.empty())
mesh_object.normals.push_back(normals[i*3+j]);
}
}
meshes.push_back(mesh_object);
}
if (node->childs)
{
std::vector<CL_Lib3dsMesh> child_meshes = export_meshes(node->childs);
meshes.insert(meshes.end(), child_meshes.begin(), child_meshes.end());
}
}
}
return meshes;
}
