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godot/editor/import/resource_importer_obj.cpp
Bartłomiej Karwacki ab8792cc7b Add vertex color support to OBJ importer
2023-05-02 12:03:01 +02:00

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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/resource_saver.h"
#include "core/os/file_access.h"
#include "scene/3d/mesh_instance.h"
#include "scene/3d/spatial.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, Map<String, Ref<SpatialMaterial>> &material_map, List<String> *r_missing_deps) {
FileAccessRef f = FileAccess::open(p_path, FileAccess::READ);
ERR_FAIL_COND_V_MSG(!f, ERR_CANT_OPEN, vformat("Couldn't open MTL file '%s', it may not exist or not be readable.", p_path));
Ref<SpatialMaterial> 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.instance();
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_feature(SpatialMaterial::FEATURE_TRANSPARENT, true);
}
} 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_feature(SpatialMaterial::FEATURE_TRANSPARENT, true);
}
} 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_abs_path()) {
path = p;
} else {
path = base_path.plus_file(p);
}
Ref<Texture> texture = ResourceLoader::load(path);
if (texture.is_valid()) {
current->set_texture(SpatialMaterial::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_abs_path()) {
path = p;
} else {
path = base_path.plus_file(p);
}
Ref<Texture> texture = ResourceLoader::load(path);
if (texture.is_valid()) {
current->set_texture(SpatialMaterial::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_abs_path()) {
path = p;
} else {
path = base_path.plus_file(p);
}
Ref<Texture> texture = ResourceLoader::load(path);
if (texture.is_valid()) {
current->set_texture(SpatialMaterial::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.plus_file(p);
Ref<Texture> texture = ResourceLoader::load(path);
if (texture.is_valid()) {
current->set_feature(SpatialMaterial::FEATURE_NORMAL_MAPPING, true);
current->set_texture(SpatialMaterial::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<Mesh>> &r_meshes, bool p_single_mesh, bool p_generate_tangents, int p_compress_flags, Vector3 p_scale_mesh, Vector3 p_offset_mesh, List<String> *r_missing_deps) {
FileAccessRef f = FileAccess::open(p_path, FileAccess::READ);
ERR_FAIL_COND_V_MSG(!f, ERR_CANT_OPEN, vformat("Couldn't open OBJ file '%s', it may not exist or not be readable.", p_path));
Ref<ArrayMesh> mesh;
mesh.instance();
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;
String name;
Map<String, Map<String, Ref<SpatialMaterial>>> material_map;
Ref<SurfaceTool> surf_tool = memnew(SurfaceTool);
surf_tool->begin(Mesh::PRIMITIVE_TRIANGLES);
String current_material_library;
String current_material;
String current_group;
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 == String()) {
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 colors
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.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].size() == 0, 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;
}
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->add_normal(normals[norm]);
}
if (face[idx].size() >= 2 && face[idx][1] != String()) {
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->add_uv(uvs[uv]);
}
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.empty()) {
surf_tool->add_color(colors[vtx]);
}
//if (weld_vertices)
// vertex.snap(Vector3(weld_tolerance, weld_tolerance, weld_tolerance));
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();
if (what == "off") {
surf_tool->add_smooth_group(false);
} else {
surf_tool->add_smooth_group(true);
}
} else if (/*l.begins_with("g ") ||*/ l.begins_with("usemtl ") || (l.begins_with("o ") || f->eof_reached())) { //commit group to mesh
//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 && uvs.size()) {
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)));
if (material_map.has(current_material_library) && material_map[current_material_library].has(current_material)) {
Ref<SpatialMaterial> &material = material_map[current_material_library][current_material];
if (!colors.empty()) {
material->set_flag(SpatialMaterial::FLAG_SRGB_VERTEX_COLOR, true);
}
surf_tool->set_material(material);
}
mesh = surf_tool->commit(mesh, p_compress_flags);
if (current_material != String()) {
mesh->surface_set_name(mesh->get_surface_count() - 1, current_material.get_basename());
} else if (current_group != String()) {
mesh->surface_set_name(mesh->get_surface_count() - 1, current_group);
}
print_verbose("OBJ: Added surface :" + mesh->surface_get_name(mesh->get_surface_count() - 1));
surf_tool->clear();
surf_tool->begin(Mesh::PRIMITIVE_TRIANGLES);
}
if (l.begins_with("o ") || f->eof_reached()) {
if (!p_single_mesh) {
mesh->set_name(name);
r_meshes.push_back(mesh);
mesh.instance();
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)) {
Map<String, Ref<SpatialMaterial>> lib;
String lib_path = current_material_library;
if (lib_path.is_rel_path()) {
lib_path = p_path.get_base_dir().plus_file(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) {
r_meshes.push_back(mesh);
}
return OK;
}
Node *EditorOBJImporter::import_scene(const String &p_path, uint32_t p_flags, int p_bake_fps, uint32_t p_compress_flags, List<String> *r_missing_deps, Error *r_err) {
List<Ref<Mesh>> meshes;
Error err = _parse_obj(p_path, meshes, false, p_flags & IMPORT_GENERATE_TANGENT_ARRAYS, p_compress_flags, Vector3(1, 1, 1), Vector3(0, 0, 0), r_missing_deps);
if (err != OK) {
if (r_err) {
*r_err = err;
}
return nullptr;
}
Spatial *scene = memnew(Spatial);
for (List<Ref<Mesh>>::Element *E = meshes.front(); E; E = E->next()) {
MeshInstance *mi = memnew(MeshInstance);
mi->set_mesh(E->get());
mi->set_name(E->get()->get_name());
scene->add_child(mi);
mi->set_owner(scene);
}
if (r_err) {
*r_err = OK;
}
return scene;
}
Ref<Animation> EditorOBJImporter::import_animation(const String &p_path, uint32_t p_flags, int p_bake_fps) {
return Ref<Animation>();
}
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_preset_count() const {
return 0;
}
String ResourceImporterOBJ::get_preset_name(int p_idx) const {
return "";
}
void ResourceImporterOBJ::get_import_options(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, "octahedral_compression"), true));
r_options->push_back(ImportOption(PropertyInfo(Variant::INT, "optimize_mesh_flags", PROPERTY_HINT_FLAGS, "Vertex,Normal,Tangent,Color,TexUV,TexUV2,Bones,Weights,Index"), VS::ARRAY_COMPRESS_DEFAULT >> VS::ARRAY_COMPRESS_BASE));
}
bool ResourceImporterOBJ::get_option_visibility(const String &p_option, const Map<StringName, Variant> &p_options) const {
return true;
}
Error ResourceImporterOBJ::import(const String &p_source_file, const String &p_save_path, const Map<StringName, Variant> &p_options, List<String> *r_platform_variants, List<String> *r_gen_files, Variant *r_metadata) {
List<Ref<Mesh>> meshes;
uint32_t compress_flags = int(p_options["optimize_mesh_flags"]) << VS::ARRAY_COMPRESS_BASE;
if (bool(p_options["octahedral_compression"])) {
compress_flags |= VS::ARRAY_FLAG_USE_OCTAHEDRAL_COMPRESSION;
}
Error err = _parse_obj(p_source_file, meshes, true, p_options["generate_tangents"], compress_flags, p_options["scale_mesh"], p_options["offset_mesh"], 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(save_path, meshes.front()->get());
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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