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godot/editor/import/3d/resource_importer_obj.cpp

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/**************************************************************************/
/* resource_importer_obj.cpp */
/**************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/**************************************************************************/
#include "resource_importer_obj.h"
#include "core/io/file_access.h"
#include "core/io/resource_saver.h"
#include "scene/3d/importer_mesh_instance_3d.h"
#include "scene/3d/mesh_instance_3d.h"
#include "scene/3d/node_3d.h"
#include "scene/resources/3d/importer_mesh.h"
#include "scene/resources/mesh.h"
#include "scene/resources/surface_tool.h"
uint32_t EditorOBJImporter::get_import_flags() const {
return IMPORT_SCENE;
}
static Error _parse_material_library(const String &p_path, HashMap<String, Ref<StandardMaterial3D>> &material_map, List<String> *r_missing_deps) {
Ref<FileAccess> f = FileAccess::open(p_path, FileAccess::READ);
ERR_FAIL_COND_V_MSG(f.is_null(), ERR_CANT_OPEN, vformat("Couldn't open MTL file '%s', it may not exist or not be readable.", p_path));
Ref<StandardMaterial3D> current;
String current_name;
String base_path = p_path.get_base_dir();
while (true) {
String l = f->get_line().strip_edges();
if (l.begins_with("newmtl ")) {
//vertex
current_name = l.replace("newmtl", "").strip_edges();
current.instantiate();
current->set_name(current_name);
material_map[current_name] = current;
} else if (l.begins_with("Ka ")) {
//uv
WARN_PRINT("OBJ: Ambient light for material '" + current_name + "' is ignored in PBR");
} else if (l.begins_with("Kd ")) {
//normal
ERR_FAIL_COND_V(current.is_null(), ERR_FILE_CORRUPT);
Vector<String> v = l.split(" ", false);
ERR_FAIL_COND_V(v.size() < 4, ERR_INVALID_DATA);
Color c = current->get_albedo();
c.r = v[1].to_float();
c.g = v[2].to_float();
c.b = v[3].to_float();
current->set_albedo(c);
} else if (l.begins_with("Ks ")) {
//normal
ERR_FAIL_COND_V(current.is_null(), ERR_FILE_CORRUPT);
Vector<String> v = l.split(" ", false);
ERR_FAIL_COND_V(v.size() < 4, ERR_INVALID_DATA);
float r = v[1].to_float();
float g = v[2].to_float();
float b = v[3].to_float();
float metalness = MAX(r, MAX(g, b));
current->set_metallic(metalness);
} else if (l.begins_with("Ns ")) {
//normal
ERR_FAIL_COND_V(current.is_null(), ERR_FILE_CORRUPT);
Vector<String> v = l.split(" ", false);
ERR_FAIL_COND_V(v.size() != 2, ERR_INVALID_DATA);
float s = v[1].to_float();
current->set_metallic((1000.0 - s) / 1000.0);
} else if (l.begins_with("d ")) {
//normal
ERR_FAIL_COND_V(current.is_null(), ERR_FILE_CORRUPT);
Vector<String> v = l.split(" ", false);
ERR_FAIL_COND_V(v.size() != 2, ERR_INVALID_DATA);
float d = v[1].to_float();
Color c = current->get_albedo();
c.a = d;
current->set_albedo(c);
if (c.a < 0.99) {
current->set_transparency(StandardMaterial3D::TRANSPARENCY_ALPHA);
}
} else if (l.begins_with("Tr ")) {
//normal
ERR_FAIL_COND_V(current.is_null(), ERR_FILE_CORRUPT);
Vector<String> v = l.split(" ", false);
ERR_FAIL_COND_V(v.size() != 2, ERR_INVALID_DATA);
float d = v[1].to_float();
Color c = current->get_albedo();
c.a = 1.0 - d;
current->set_albedo(c);
if (c.a < 0.99) {
current->set_transparency(StandardMaterial3D::TRANSPARENCY_ALPHA);
}
} else if (l.begins_with("map_Ka ")) {
//uv
WARN_PRINT("OBJ: Ambient light texture for material '" + current_name + "' is ignored in PBR");
} else if (l.begins_with("map_Kd ")) {
//normal
ERR_FAIL_COND_V(current.is_null(), ERR_FILE_CORRUPT);
String p = l.replace("map_Kd", "").replace("\\", "/").strip_edges();
String path;
if (p.is_absolute_path()) {
path = p;
} else {
path = base_path.path_join(p);
}
Ref<Texture2D> texture = ResourceLoader::load(path);
if (texture.is_valid()) {
current->set_texture(StandardMaterial3D::TEXTURE_ALBEDO, texture);
} else if (r_missing_deps) {
r_missing_deps->push_back(path);
}
} else if (l.begins_with("map_Ks ")) {
//normal
ERR_FAIL_COND_V(current.is_null(), ERR_FILE_CORRUPT);
String p = l.replace("map_Ks", "").replace("\\", "/").strip_edges();
String path;
if (p.is_absolute_path()) {
path = p;
} else {
path = base_path.path_join(p);
}
Ref<Texture2D> texture = ResourceLoader::load(path);
if (texture.is_valid()) {
current->set_texture(StandardMaterial3D::TEXTURE_METALLIC, texture);
} else if (r_missing_deps) {
r_missing_deps->push_back(path);
}
} else if (l.begins_with("map_Ns ")) {
//normal
ERR_FAIL_COND_V(current.is_null(), ERR_FILE_CORRUPT);
String p = l.replace("map_Ns", "").replace("\\", "/").strip_edges();
String path;
if (p.is_absolute_path()) {
path = p;
} else {
path = base_path.path_join(p);
}
Ref<Texture2D> texture = ResourceLoader::load(path);
if (texture.is_valid()) {
current->set_texture(StandardMaterial3D::TEXTURE_ROUGHNESS, texture);
} else if (r_missing_deps) {
r_missing_deps->push_back(path);
}
} else if (l.begins_with("map_bump ")) {
//normal
ERR_FAIL_COND_V(current.is_null(), ERR_FILE_CORRUPT);
String p = l.replace("map_bump", "").replace("\\", "/").strip_edges();
String path = base_path.path_join(p);
Ref<Texture2D> texture = ResourceLoader::load(path);
if (texture.is_valid()) {
current->set_feature(StandardMaterial3D::FEATURE_NORMAL_MAPPING, true);
current->set_texture(StandardMaterial3D::TEXTURE_NORMAL, texture);
} else if (r_missing_deps) {
r_missing_deps->push_back(path);
}
} else if (f->eof_reached()) {
break;
}
}
return OK;
}
static Error _parse_obj(const String &p_path, List<Ref<ImporterMesh>> &r_meshes, bool p_single_mesh, bool p_generate_tangents, Vector3 p_scale_mesh, Vector3 p_offset_mesh, bool p_disable_compression, List<String> *r_missing_deps) {
Ref<FileAccess> f = FileAccess::open(p_path, FileAccess::READ);
ERR_FAIL_COND_V_MSG(f.is_null(), ERR_CANT_OPEN, vformat("Couldn't open OBJ file '%s', it may not exist or not be readable.", p_path));
// Avoid trying to load/interpret potential build artifacts from Visual Studio (e.g. when compiling native plugins inside the project tree)
// This should only match, if it's indeed a COFF file header
// https://learn.microsoft.com/en-us/windows/win32/debug/pe-format#machine-types
const int first_bytes = f->get_16();
static const Vector<int> coff_header_machines{
0x0, // IMAGE_FILE_MACHINE_UNKNOWN
0x8664, // IMAGE_FILE_MACHINE_AMD64
0x1c0, // IMAGE_FILE_MACHINE_ARM
0x14c, // IMAGE_FILE_MACHINE_I386
0x200, // IMAGE_FILE_MACHINE_IA64
};
ERR_FAIL_COND_V_MSG(coff_header_machines.has(first_bytes), ERR_FILE_CORRUPT, vformat("Couldn't read OBJ file '%s', it seems to be binary, corrupted, or empty.", p_path));
f->seek(0);
Ref<ImporterMesh> mesh;
mesh.instantiate();
bool generate_tangents = p_generate_tangents;
Vector3 scale_mesh = p_scale_mesh;
Vector3 offset_mesh = p_offset_mesh;
Vector<Vector3> vertices;
Vector<Vector3> normals;
Vector<Vector2> uvs;
Vector<Color> colors;
const String default_name = "Mesh";
String name = default_name;
HashMap<String, HashMap<String, Ref<StandardMaterial3D>>> material_map;
Ref<SurfaceTool> surf_tool = memnew(SurfaceTool);
surf_tool->begin(Mesh::PRIMITIVE_TRIANGLES);
String current_material_library;
String current_material;
String current_group;
uint32_t smooth_group = 0;
bool smoothing = true;
const uint32_t no_smoothing_smooth_group = (uint32_t)-1;
bool uses_uvs = false;
while (true) {
String l = f->get_line().strip_edges();
while (l.length() && l[l.length() - 1] == '\\') {
String add = f->get_line().strip_edges();
l += add;
if (add.is_empty()) {
break;
}
}
if (l.begins_with("v ")) {
//vertex
Vector<String> v = l.split(" ", false);
ERR_FAIL_COND_V(v.size() < 4, ERR_FILE_CORRUPT);
Vector3 vtx;
vtx.x = v[1].to_float() * scale_mesh.x + offset_mesh.x;
vtx.y = v[2].to_float() * scale_mesh.y + offset_mesh.y;
vtx.z = v[3].to_float() * scale_mesh.z + offset_mesh.z;
vertices.push_back(vtx);
//vertex color
if (v.size() >= 7) {
while (colors.size() < vertices.size() - 1) {
colors.push_back(Color(1.0, 1.0, 1.0));
}
Color c;
c.r = v[4].to_float();
c.g = v[5].to_float();
c.b = v[6].to_float();
colors.push_back(c);
} else if (!colors.is_empty()) {
colors.push_back(Color(1.0, 1.0, 1.0));
}
} else if (l.begins_with("vt ")) {
//uv
Vector<String> v = l.split(" ", false);
ERR_FAIL_COND_V(v.size() < 3, ERR_FILE_CORRUPT);
Vector2 uv;
uv.x = v[1].to_float();
uv.y = 1.0 - v[2].to_float();
uvs.push_back(uv);
} else if (l.begins_with("vn ")) {
//normal
Vector<String> v = l.split(" ", false);
ERR_FAIL_COND_V(v.size() < 4, ERR_FILE_CORRUPT);
Vector3 nrm;
nrm.x = v[1].to_float();
nrm.y = v[2].to_float();
nrm.z = v[3].to_float();
normals.push_back(nrm);
} else if (l.begins_with("f ")) {
//vertex
Vector<String> v = l.split(" ", false);
ERR_FAIL_COND_V(v.size() < 4, ERR_FILE_CORRUPT);
//not very fast, could be sped up
Vector<String> face[3];
face[0] = v[1].split("/");
face[1] = v[2].split("/");
ERR_FAIL_COND_V(face[0].is_empty(), ERR_FILE_CORRUPT);
ERR_FAIL_COND_V(face[0].size() != face[1].size(), ERR_FILE_CORRUPT);
for (int i = 2; i < v.size() - 1; i++) {
face[2] = v[i + 1].split("/");
ERR_FAIL_COND_V(face[0].size() != face[2].size(), ERR_FILE_CORRUPT);
for (int j = 0; j < 3; j++) {
int idx = j;
if (idx < 2) {
idx = 1 ^ idx;
}
// Check UVs before faces as we may need to generate dummy tangents if there are no UVs.
if (face[idx].size() >= 2 && !face[idx][1].is_empty()) {
int uv = face[idx][1].to_int() - 1;
if (uv < 0) {
uv += uvs.size() + 1;
}
ERR_FAIL_INDEX_V(uv, uvs.size(), ERR_FILE_CORRUPT);
surf_tool->set_uv(uvs[uv]);
uses_uvs = true;
}
if (face[idx].size() == 3) {
int norm = face[idx][2].to_int() - 1;
if (norm < 0) {
norm += normals.size() + 1;
}
ERR_FAIL_INDEX_V(norm, normals.size(), ERR_FILE_CORRUPT);
surf_tool->set_normal(normals[norm]);
if (generate_tangents && !uses_uvs) {
// We can't generate tangents without UVs, so create dummy tangents.
Vector3 tan = Vector3(normals[norm].z, -normals[norm].x, normals[norm].y).cross(normals[norm].normalized()).normalized();
surf_tool->set_tangent(Plane(tan.x, tan.y, tan.z, 1.0));
}
} else {
// No normals, use a dummy tangent since normals and tangents will be generated.
if (generate_tangents && !uses_uvs) {
// We can't generate tangents without UVs, so create dummy tangents.
surf_tool->set_tangent(Plane(1.0, 0.0, 0.0, 1.0));
}
}
int vtx = face[idx][0].to_int() - 1;
if (vtx < 0) {
vtx += vertices.size() + 1;
}
ERR_FAIL_INDEX_V(vtx, vertices.size(), ERR_FILE_CORRUPT);
Vector3 vertex = vertices[vtx];
if (!colors.is_empty()) {
surf_tool->set_color(colors[vtx]);
}
surf_tool->set_smooth_group(smoothing ? smooth_group : no_smoothing_smooth_group);
surf_tool->add_vertex(vertex);
}
face[1] = face[2];
}
} else if (l.begins_with("s ")) { //smoothing
String what = l.substr(2, l.length()).strip_edges();
bool do_smooth;
if (what == "off") {
do_smooth = false;
} else {
do_smooth = true;
}
if (do_smooth != smoothing) {
smoothing = do_smooth;
if (smoothing) {
smooth_group++;
}
}
} else if (/*l.begins_with("g ") ||*/ l.begins_with("usemtl ") || (l.begins_with("o ") || f->eof_reached())) { //commit group to mesh
uint64_t mesh_flags = RS::ARRAY_FLAG_COMPRESS_ATTRIBUTES;
if (p_disable_compression) {
mesh_flags = 0;
} else {
bool is_mesh_2d = true;
// Disable compression if all z equals 0 (the mesh is 2D).
for (int i = 0; i < vertices.size(); i++) {
if (!Math::is_zero_approx(vertices[i].z)) {
is_mesh_2d = false;
break;
}
}
if (is_mesh_2d) {
mesh_flags = 0;
}
}
//groups are too annoying
if (surf_tool->get_vertex_array().size()) {
//another group going on, commit it
if (normals.size() == 0) {
surf_tool->generate_normals();
}
if (generate_tangents && uses_uvs) {
surf_tool->generate_tangents();
}
surf_tool->index();
print_verbose("OBJ: Current material library " + current_material_library + " has " + itos(material_map.has(current_material_library)));
print_verbose("OBJ: Current material " + current_material + " has " + itos(material_map.has(current_material_library) && material_map[current_material_library].has(current_material)));
Ref<StandardMaterial3D> material;
if (material_map.has(current_material_library) && material_map[current_material_library].has(current_material)) {
material = material_map[current_material_library][current_material];
if (!colors.is_empty()) {
material->set_flag(StandardMaterial3D::FLAG_SRGB_VERTEX_COLOR, true);
}
surf_tool->set_material(material);
}
Array array = surf_tool->commit_to_arrays();
if (mesh_flags & RS::ARRAY_FLAG_COMPRESS_ATTRIBUTES && generate_tangents && uses_uvs) {
// Compression is enabled, so let's validate that the normals and generated tangents are correct.
Vector<Vector3> norms = array[Mesh::ARRAY_NORMAL];
Vector<float> tangents = array[Mesh::ARRAY_TANGENT];
ERR_FAIL_COND_V(tangents.is_empty(), ERR_FILE_CORRUPT);
for (int vert = 0; vert < norms.size(); vert++) {
Vector3 tan = Vector3(tangents[vert * 4 + 0], tangents[vert * 4 + 1], tangents[vert * 4 + 2]);
if (abs(tan.dot(norms[vert])) > 0.0001) {
// Tangent is not perpendicular to the normal, so we can't use compression.
mesh_flags &= ~RS::ARRAY_FLAG_COMPRESS_ATTRIBUTES;
}
}
}
mesh->add_surface(Mesh::PRIMITIVE_TRIANGLES, array, TypedArray<Array>(), Dictionary(), material, name, mesh_flags);
print_verbose("OBJ: Added surface :" + mesh->get_surface_name(mesh->get_surface_count() - 1));
if (!current_material.is_empty()) {
if (mesh->get_surface_count() >= 1) {
mesh->set_surface_name(mesh->get_surface_count() - 1, current_material.get_basename());
}
} else if (!current_group.is_empty()) {
if (mesh->get_surface_count() >= 1) {
mesh->set_surface_name(mesh->get_surface_count() - 1, current_group);
}
}
surf_tool->clear();
surf_tool->begin(Mesh::PRIMITIVE_TRIANGLES);
uses_uvs = false;
}
if (l.begins_with("o ") || f->eof_reached()) {
if (!p_single_mesh) {
if (mesh->get_surface_count() > 0) {
mesh->set_name(name);
r_meshes.push_back(mesh);
mesh.instantiate();
}
name = default_name;
current_group = "";
current_material = "";
}
}
if (f->eof_reached()) {
break;
}
if (l.begins_with("o ")) {
name = l.substr(2, l.length()).strip_edges();
}
if (l.begins_with("usemtl ")) {
current_material = l.replace("usemtl", "").strip_edges();
}
if (l.begins_with("g ")) {
current_group = l.substr(2, l.length()).strip_edges();
}
} else if (l.begins_with("mtllib ")) { //parse material
current_material_library = l.replace("mtllib", "").strip_edges();
if (!material_map.has(current_material_library)) {
HashMap<String, Ref<StandardMaterial3D>> lib;
String lib_path = current_material_library;
if (lib_path.is_relative_path()) {
lib_path = p_path.get_base_dir().path_join(current_material_library);
}
Error err = _parse_material_library(lib_path, lib, r_missing_deps);
if (err == OK) {
material_map[current_material_library] = lib;
}
}
}
}
if (p_single_mesh && mesh->get_surface_count() > 0) {
r_meshes.push_back(mesh);
}
return OK;
}
Node *EditorOBJImporter::import_scene(const String &p_path, uint32_t p_flags, const HashMap<StringName, Variant> &p_options, List<String> *r_missing_deps, Error *r_err) {
List<Ref<ImporterMesh>> meshes;
Error err = _parse_obj(p_path, meshes, false, p_flags & IMPORT_GENERATE_TANGENT_ARRAYS, Vector3(1, 1, 1), Vector3(0, 0, 0), p_flags & IMPORT_FORCE_DISABLE_MESH_COMPRESSION, r_missing_deps);
if (err != OK) {
if (r_err) {
*r_err = err;
}
return nullptr;
}
Node3D *scene = memnew(Node3D);
for (Ref<ImporterMesh> m : meshes) {
ImporterMeshInstance3D *mi = memnew(ImporterMeshInstance3D);
mi->set_mesh(m);
mi->set_name(m->get_name());
scene->add_child(mi, true);
mi->set_owner(scene);
}
if (r_err) {
*r_err = OK;
}
return scene;
}
void EditorOBJImporter::get_extensions(List<String> *r_extensions) const {
r_extensions->push_back("obj");
}
EditorOBJImporter::EditorOBJImporter() {
}
////////////////////////////////////////////////////
String ResourceImporterOBJ::get_importer_name() const {
return "wavefront_obj";
}
String ResourceImporterOBJ::get_visible_name() const {
return "OBJ as Mesh";
}
void ResourceImporterOBJ::get_recognized_extensions(List<String> *p_extensions) const {
p_extensions->push_back("obj");
}
String ResourceImporterOBJ::get_save_extension() const {
return "mesh";
}
String ResourceImporterOBJ::get_resource_type() const {
return "Mesh";
}
int ResourceImporterOBJ::get_format_version() const {
return 1;
}
int ResourceImporterOBJ::get_preset_count() const {
return 0;
}
String ResourceImporterOBJ::get_preset_name(int p_idx) const {
return "";
}
void ResourceImporterOBJ::get_import_options(const String &p_path, List<ImportOption> *r_options, int p_preset) const {
r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "generate_tangents"), true));
r_options->push_back(ImportOption(PropertyInfo(Variant::VECTOR3, "scale_mesh"), Vector3(1, 1, 1)));
r_options->push_back(ImportOption(PropertyInfo(Variant::VECTOR3, "offset_mesh"), Vector3(0, 0, 0)));
r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "force_disable_mesh_compression"), false));
}
bool ResourceImporterOBJ::get_option_visibility(const String &p_path, const String &p_option, const HashMap<StringName, Variant> &p_options) const {
return true;
}
Error ResourceImporterOBJ::import(const String &p_source_file, const String &p_save_path, const HashMap<StringName, Variant> &p_options, List<String> *r_platform_variants, List<String> *r_gen_files, Variant *r_metadata) {
List<Ref<ImporterMesh>> meshes;
Error err = _parse_obj(p_source_file, meshes, true, p_options["generate_tangents"], p_options["scale_mesh"], p_options["offset_mesh"], p_options["force_disable_mesh_compression"], nullptr);
ERR_FAIL_COND_V(err != OK, err);
ERR_FAIL_COND_V(meshes.size() != 1, ERR_BUG);
String save_path = p_save_path + ".mesh";
err = ResourceSaver::save(meshes.front()->get()->get_mesh(), save_path);
ERR_FAIL_COND_V_MSG(err != OK, err, "Cannot save Mesh to file '" + save_path + "'.");
r_gen_files->push_back(save_path);
return OK;
}
ResourceImporterOBJ::ResourceImporterOBJ() {
}
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