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/* SPDX-License-Identifier: GPL-2.0-or-later */
/** \file
* \ingroup obj
*/
#include <algorithm>
#include <cstdio>
#include "BKE_blender_version.h"
#include "BLI_enumerable_thread_specific.hh"
#include "BLI_path_util.h"
#include "BLI_task.hh"
#include "obj_export_mesh.hh"
#include "obj_export_mtl.hh"
#include "obj_export_nurbs.hh"
#include "obj_export_file_writer.hh"
namespace blender::io::obj {
/**
* Per reference http://www.martinreddy.net/gfx/3d/OBJ.spec:
* To turn off smoothing groups, use a value of 0 or off.
* Polygonal elements use group numbers to put elements in different smoothing groups.
* For free-form surfaces, smoothing groups are either turned on or off;
* there is no difference between values greater than 0.
*/
const int SMOOTH_GROUP_DISABLED = 0;
const int SMOOTH_GROUP_DEFAULT = 1;
static const char *DEFORM_GROUP_DISABLED = "off";
/* There is no deform group default name. Use what the user set in the UI. */
/**
* Per reference http://www.martinreddy.net/gfx/3d/OBJ.spec:
* Once a material is assigned, it cannot be turned off; it can only be changed.
* If a material name is not specified, a white material is used.
* So an empty material name is written. */
static const char *MATERIAL_GROUP_DISABLED = "";
void OBJWriter::write_vert_uv_normal_indices(FormatHandler<eFileType::OBJ> &fh,
const IndexOffsets &offsets,
Span<int> vert_indices,
Span<int> uv_indices,
Span<int> normal_indices,
bool flip) const
{
BLI_assert(vert_indices.size() == uv_indices.size() &&
vert_indices.size() == normal_indices.size());
const int vertex_offset = offsets.vertex_offset + 1;
const int uv_offset = offsets.uv_vertex_offset + 1;
const int normal_offset = offsets.normal_offset + 1;
const int n = vert_indices.size();
fh.write<eOBJSyntaxElement::poly_element_begin>();
if (!flip) {
for (int j = 0; j < n; ++j) {
fh.write<eOBJSyntaxElement::vertex_uv_normal_indices>(vert_indices[j] + vertex_offset,
uv_indices[j] + uv_offset,
normal_indices[j] + normal_offset);
}
}
else {
/* For a transform that is mirrored (negative scale on odd number of axes),
* we want to flip the face index order. Start from the same index, and
* then go backwards. Same logic in other write_*_indices functions below. */
for (int k = 0; k < n; ++k) {
int j = k == 0 ? 0 : n - k;
fh.write<eOBJSyntaxElement::vertex_uv_normal_indices>(vert_indices[j] + vertex_offset,
uv_indices[j] + uv_offset,
normal_indices[j] + normal_offset);
}
}
fh.write<eOBJSyntaxElement::poly_element_end>();
}
void OBJWriter::write_vert_normal_indices(FormatHandler<eFileType::OBJ> &fh,
const IndexOffsets &offsets,
Span<int> vert_indices,
Span<int> /*uv_indices*/,
Span<int> normal_indices,
bool flip) const
{
BLI_assert(vert_indices.size() == normal_indices.size());
const int vertex_offset = offsets.vertex_offset + 1;
const int normal_offset = offsets.normal_offset + 1;
const int n = vert_indices.size();
fh.write<eOBJSyntaxElement::poly_element_begin>();
if (!flip) {
for (int j = 0; j < n; ++j) {
fh.write<eOBJSyntaxElement::vertex_normal_indices>(vert_indices[j] + vertex_offset,
normal_indices[j] + normal_offset);
}
}
else {
for (int k = 0; k < n; ++k) {
int j = k == 0 ? 0 : n - k;
fh.write<eOBJSyntaxElement::vertex_normal_indices>(vert_indices[j] + vertex_offset,
normal_indices[j] + normal_offset);
}
}
fh.write<eOBJSyntaxElement::poly_element_end>();
}
void OBJWriter::write_vert_uv_indices(FormatHandler<eFileType::OBJ> &fh,
const IndexOffsets &offsets,
Span<int> vert_indices,
Span<int> uv_indices,
Span<int> /*normal_indices*/,
bool flip) const
{
BLI_assert(vert_indices.size() == uv_indices.size());
const int vertex_offset = offsets.vertex_offset + 1;
const int uv_offset = offsets.uv_vertex_offset + 1;
const int n = vert_indices.size();
fh.write<eOBJSyntaxElement::poly_element_begin>();
if (!flip) {
for (int j = 0; j < n; ++j) {
fh.write<eOBJSyntaxElement::vertex_uv_indices>(vert_indices[j] + vertex_offset,
uv_indices[j] + uv_offset);
}
}
else {
for (int k = 0; k < n; ++k) {
int j = k == 0 ? 0 : n - k;
fh.write<eOBJSyntaxElement::vertex_uv_indices>(vert_indices[j] + vertex_offset,
uv_indices[j] + uv_offset);
}
}
fh.write<eOBJSyntaxElement::poly_element_end>();
}
void OBJWriter::write_vert_indices(FormatHandler<eFileType::OBJ> &fh,
const IndexOffsets &offsets,
Span<int> vert_indices,
Span<int> /*uv_indices*/,
Span<int> /*normal_indices*/,
bool flip) const
{
const int vertex_offset = offsets.vertex_offset + 1;
const int n = vert_indices.size();
fh.write<eOBJSyntaxElement::poly_element_begin>();
if (!flip) {
for (int j = 0; j < n; ++j) {
fh.write<eOBJSyntaxElement::vertex_indices>(vert_indices[j] + vertex_offset);
}
}
else {
for (int k = 0; k < n; ++k) {
int j = k == 0 ? 0 : n - k;
fh.write<eOBJSyntaxElement::vertex_indices>(vert_indices[j] + vertex_offset);
}
}
fh.write<eOBJSyntaxElement::poly_element_end>();
}
void OBJWriter::write_header() const
{
using namespace std::string_literals;
FormatHandler<eFileType::OBJ> fh;
fh.write<eOBJSyntaxElement::string>("# Blender "s + BKE_blender_version_string() + "\n");
fh.write<eOBJSyntaxElement::string>("# www.blender.org\n");
fh.write_to_file(outfile_);
}
void OBJWriter::write_mtllib_name(const StringRefNull mtl_filepath) const
{
/* Split .MTL file path into parent directory and filename. */
char mtl_file_name[FILE_MAXFILE];
char mtl_dir_name[FILE_MAXDIR];
BLI_split_dirfile(mtl_filepath.data(), mtl_dir_name, mtl_file_name, FILE_MAXDIR, FILE_MAXFILE);
FormatHandler<eFileType::OBJ> fh;
fh.write<eOBJSyntaxElement::mtllib>(mtl_file_name);
fh.write_to_file(outfile_);
}
void OBJWriter::write_object_name(FormatHandler<eFileType::OBJ> &fh,
const OBJMesh &obj_mesh_data) const
{
const char *object_name = obj_mesh_data.get_object_name();
if (export_params_.export_object_groups) {
const std::string object_name = obj_mesh_data.get_object_name();
const char *mesh_name = obj_mesh_data.get_object_mesh_name();
fh.write<eOBJSyntaxElement::object_group>(object_name + "_" + mesh_name);
return;
}
fh.write<eOBJSyntaxElement::object_name>(object_name);
}
/* Split up large meshes into multi-threaded jobs; each job processes
* this amount of items. */
static const int chunk_size = 32768;
static int calc_chunk_count(int count)
{
return (count + chunk_size - 1) / chunk_size;
}
/* Write /tot_count/ items to OBJ file output. Each item is written
* by a /function/ that should be independent from other items.
* If the amount of items is large enough (> chunk_size), then writing
* will be done in parallel, into temporary FormatHandler buffers that
* will be written into the final /fh/ buffer at the end.
*/
template<typename Function>
void obj_parallel_chunked_output(FormatHandler<eFileType::OBJ> &fh,
int tot_count,
const Function &function)
{
if (tot_count <= 0) {
return;
}
/* If we have just one chunk, process it directly into the output
* buffer - avoids all the job scheduling and temporary vector allocation
* overhead. */
const int chunk_count = calc_chunk_count(tot_count);
if (chunk_count == 1) {
for (int i = 0; i < tot_count; i++) {
function(fh, i);
}
return;
}
/* Give each chunk its own temporary output buffer, and process them in parallel. */
std::vector<FormatHandler<eFileType::OBJ>> buffers(chunk_count);
blender::threading::parallel_for(IndexRange(chunk_count), 1, [&](IndexRange range) {
for (const int r : range) {
int i_start = r * chunk_size;
int i_end = std::min(i_start + chunk_size, tot_count);
auto &buf = buffers[r];
for (int i = i_start; i < i_end; i++) {
function(buf, i);
}
}
});
/* Emit all temporary output buffers into the destination buffer. */
for (auto &buf : buffers) {
fh.append_from(buf);
}
}
void OBJWriter::write_vertex_coords(FormatHandler<eFileType::OBJ> &fh,
const OBJMesh &obj_mesh_data) const
{
const int tot_count = obj_mesh_data.tot_vertices();
obj_parallel_chunked_output(fh, tot_count, [&](FormatHandler<eFileType::OBJ> &buf, int i) {
float3 vertex = obj_mesh_data.calc_vertex_coords(i, export_params_.scaling_factor);
buf.write<eOBJSyntaxElement::vertex_coords>(vertex[0], vertex[1], vertex[2]);
});
}
void OBJWriter::write_uv_coords(FormatHandler<eFileType::OBJ> &fh, OBJMesh &r_obj_mesh_data) const
{
const Vector<float2> &uv_coords = r_obj_mesh_data.get_uv_coords();
const int tot_count = uv_coords.size();
obj_parallel_chunked_output(fh, tot_count, [&](FormatHandler<eFileType::OBJ> &buf, int i) {
const float2 &uv_vertex = uv_coords[i];
buf.write<eOBJSyntaxElement::uv_vertex_coords>(uv_vertex[0], uv_vertex[1]);
});
}
void OBJWriter::write_poly_normals(FormatHandler<eFileType::OBJ> &fh, OBJMesh &obj_mesh_data)
{
/* Poly normals should be calculated earlier via store_normal_coords_and_indices. */
const Vector<float3> &normal_coords = obj_mesh_data.get_normal_coords();
const int tot_count = normal_coords.size();
obj_parallel_chunked_output(fh, tot_count, [&](FormatHandler<eFileType::OBJ> &buf, int i) {
const float3 &normal = normal_coords[i];
buf.write<eOBJSyntaxElement::normal>(normal[0], normal[1], normal[2]);
});
}
OBJWriter::func_vert_uv_normal_indices OBJWriter::get_poly_element_writer(
const int total_uv_vertices) const
{
if (export_params_.export_normals) {
if (export_params_.export_uv && (total_uv_vertices > 0)) {
/* Write both normals and UV indices. */
return &OBJWriter::write_vert_uv_normal_indices;
}
/* Write normals indices. */
return &OBJWriter::write_vert_normal_indices;
}
/* Write UV indices. */
if (export_params_.export_uv && (total_uv_vertices > 0)) {
return &OBJWriter::write_vert_uv_indices;
}
/* Write neither normals nor UV indices. */
return &OBJWriter::write_vert_indices;
}
static int get_smooth_group(const OBJMesh &mesh, const OBJExportParams ¶ms, int poly_idx)
{
if (poly_idx < 0) {
return NEGATIVE_INIT;
}
int group = SMOOTH_GROUP_DISABLED;
if (mesh.is_ith_poly_smooth(poly_idx)) {
group = !params.export_smooth_groups ? SMOOTH_GROUP_DEFAULT : mesh.ith_smooth_group(poly_idx);
}
return group;
}
void OBJWriter::write_poly_elements(FormatHandler<eFileType::OBJ> &fh,
const IndexOffsets &offsets,
const OBJMesh &obj_mesh_data,
std::function<const char *(int)> matname_fn)
{
const func_vert_uv_normal_indices poly_element_writer = get_poly_element_writer(
obj_mesh_data.tot_uv_vertices());
const int tot_polygons = obj_mesh_data.tot_polygons();
const int tot_deform_groups = obj_mesh_data.tot_deform_groups();
threading::EnumerableThreadSpecific<Vector<float>> group_weights;
obj_parallel_chunked_output(fh, tot_polygons, [&](FormatHandler<eFileType::OBJ> &buf, int idx) {
/* Polygon order for writing into the file is not necessarily the same
* as order in the mesh; it will be sorted by material indices. Remap current
* and previous indices here according to the order. */
int prev_i = obj_mesh_data.remap_poly_index(idx - 1);
int i = obj_mesh_data.remap_poly_index(idx);
Vector<int> poly_vertex_indices = obj_mesh_data.calc_poly_vertex_indices(i);
Span<int> poly_uv_indices = obj_mesh_data.calc_poly_uv_indices(i);
Vector<int> poly_normal_indices = obj_mesh_data.calc_poly_normal_indices(i);
/* Write smoothing group if different from previous. */
{
const int prev_group = get_smooth_group(obj_mesh_data, export_params_, prev_i);
const int group = get_smooth_group(obj_mesh_data, export_params_, i);
if (group != prev_group) {
buf.write<eOBJSyntaxElement::smooth_group>(group);
}
}
/* Write vertex group if different from previous. */
if (export_params_.export_vertex_groups) {
Vector<float> &local_weights = group_weights.local();
local_weights.resize(tot_deform_groups);
const int16_t prev_group = idx == 0 ? NEGATIVE_INIT :
obj_mesh_data.get_poly_deform_group_index(
prev_i, local_weights);
const int16_t group = obj_mesh_data.get_poly_deform_group_index(i, local_weights);
if (group != prev_group) {
buf.write<eOBJSyntaxElement::object_group>(
group == NOT_FOUND ? DEFORM_GROUP_DISABLED :
obj_mesh_data.get_poly_deform_group_name(group));
}
}
/* Write material name and material group if different from previous. */
if (export_params_.export_materials && obj_mesh_data.tot_materials() > 0) {
const int16_t prev_mat = idx == 0 ? NEGATIVE_INIT : obj_mesh_data.ith_poly_matnr(prev_i);
const int16_t mat = obj_mesh_data.ith_poly_matnr(i);
if (mat != prev_mat) {
if (mat == NOT_FOUND) {
buf.write<eOBJSyntaxElement::poly_usemtl>(MATERIAL_GROUP_DISABLED);
}
else {
const char *mat_name = matname_fn(mat);
if (!mat_name) {
mat_name = MATERIAL_GROUP_DISABLED;
}
if (export_params_.export_material_groups) {
const std::string object_name = obj_mesh_data.get_object_name();
fh.write<eOBJSyntaxElement::object_group>(object_name + "_" + mat_name);
}
buf.write<eOBJSyntaxElement::poly_usemtl>(mat_name);
}
}
}
/* Write polygon elements. */
(this->*poly_element_writer)(buf,
offsets,
poly_vertex_indices,
poly_uv_indices,
poly_normal_indices,
obj_mesh_data.is_mirrored_transform());
});
}
void OBJWriter::write_edges_indices(FormatHandler<eFileType::OBJ> &fh,
const IndexOffsets &offsets,
const OBJMesh &obj_mesh_data) const
{
/* Note: ensure_mesh_edges should be called before. */
const int tot_edges = obj_mesh_data.tot_edges();
for (int edge_index = 0; edge_index < tot_edges; edge_index++) {
const std::optional<std::array<int, 2>> vertex_indices =
obj_mesh_data.calc_loose_edge_vert_indices(edge_index);
if (!vertex_indices) {
continue;
}
fh.write<eOBJSyntaxElement::edge>((*vertex_indices)[0] + offsets.vertex_offset + 1,
(*vertex_indices)[1] + offsets.vertex_offset + 1);
}
}
void OBJWriter::write_nurbs_curve(FormatHandler<eFileType::OBJ> &fh,
const OBJCurve &obj_nurbs_data) const
{
const int total_splines = obj_nurbs_data.total_splines();
for (int spline_idx = 0; spline_idx < total_splines; spline_idx++) {
const int total_vertices = obj_nurbs_data.total_spline_vertices(spline_idx);
for (int vertex_idx = 0; vertex_idx < total_vertices; vertex_idx++) {
const float3 vertex_coords = obj_nurbs_data.vertex_coordinates(
spline_idx, vertex_idx, export_params_.scaling_factor);
fh.write<eOBJSyntaxElement::vertex_coords>(
vertex_coords[0], vertex_coords[1], vertex_coords[2]);
}
const char *nurbs_name = obj_nurbs_data.get_curve_name();
const int nurbs_degree = obj_nurbs_data.get_nurbs_degree(spline_idx);
fh.write<eOBJSyntaxElement::object_group>(nurbs_name);
fh.write<eOBJSyntaxElement::cstype>();
fh.write<eOBJSyntaxElement::nurbs_degree>(nurbs_degree);
/**
* The numbers written here are indices into the vertex coordinates written
* earlier, relative to the line that is going to be written.
* [0.0 - 1.0] is the curve parameter range.
* 0.0 1.0 -1 -2 -3 -4 for a non-cyclic curve with 4 vertices.
* 0.0 1.0 -1 -2 -3 -4 -1 -2 -3 for a cyclic curve with 4 vertices.
*/
const int total_control_points = obj_nurbs_data.total_spline_control_points(spline_idx);
fh.write<eOBJSyntaxElement::curve_element_begin>();
for (int i = 0; i < total_control_points; i++) {
/* "+1" to keep indices one-based, even if they're negative: i.e., -1 refers to the
* last vertex coordinate, -2 second last. */
fh.write<eOBJSyntaxElement::vertex_indices>(-((i % total_vertices) + 1));
}
fh.write<eOBJSyntaxElement::curve_element_end>();
/**
* In `parm u 0 0.1 ..` line:, (total control points + 2) equidistant numbers in the
* parameter range are inserted. However for curves with endpoint flag,
* first degree+1 numbers are zeroes, and last degree+1 numbers are ones
*/
const short flagsu = obj_nurbs_data.get_nurbs_flagu(spline_idx);
const bool cyclic = flagsu & CU_NURB_CYCLIC;
const bool endpoint = !cyclic && (flagsu & CU_NURB_ENDPOINT);
fh.write<eOBJSyntaxElement::nurbs_parameter_begin>();
for (int i = 1; i <= total_control_points + 2; i++) {
float parm = 1.0f * i / (total_control_points + 2 + 1);
if (endpoint) {
if (i <= nurbs_degree) {
parm = 0;
}
else if (i > total_control_points + 2 - nurbs_degree) {
parm = 1;
}
}
fh.write<eOBJSyntaxElement::nurbs_parameters>(parm);
}
fh.write<eOBJSyntaxElement::nurbs_parameter_end>();
fh.write<eOBJSyntaxElement::nurbs_group_end>();
}
}
/* -------------------------------------------------------------------- */
/** \name .MTL writers.
* \{ */
/**
* Convert #float3 to string of space-separated numbers, with no leading or trailing space.
* Only to be used in NON-performance-critical code.
*/
static std::string float3_to_string(const float3 &numbers)
{
std::ostringstream r_string;
r_string << numbers[0] << " " << numbers[1] << " " << numbers[2];
return r_string.str();
};
MTLWriter::MTLWriter(const char *obj_filepath) noexcept(false)
{
mtl_filepath_ = obj_filepath;
const bool ok = BLI_path_extension_replace(mtl_filepath_.data(), FILE_MAX, ".mtl");
if (!ok) {
throw std::system_error(ENAMETOOLONG, std::system_category(), "");
}
outfile_ = BLI_fopen(mtl_filepath_.c_str(), "wb");
if (!outfile_) {
throw std::system_error(errno, std::system_category(), "Cannot open file " + mtl_filepath_);
}
}
MTLWriter::~MTLWriter()
{
if (outfile_) {
fmt_handler_.write_to_file(outfile_);
if (std::fclose(outfile_)) {
std::cerr << "Error: could not close the file '" << mtl_filepath_
<< "' properly, it may be corrupted." << std::endl;
}
}
}
void MTLWriter::write_header(const char *blen_filepath)
{
using namespace std::string_literals;
const char *blen_basename = (blen_filepath && blen_filepath[0] != '\0') ?
BLI_path_basename(blen_filepath) :
"None";
fmt_handler_.write<eMTLSyntaxElement::string>("# Blender "s + BKE_blender_version_string() +
" MTL File: '" + blen_basename + "'\n");
fmt_handler_.write<eMTLSyntaxElement::string>("# www.blender.org\n");
}
StringRefNull MTLWriter::mtl_file_path() const
{
return mtl_filepath_;
}
void MTLWriter::write_bsdf_properties(const MTLMaterial &mtl_material)
{
fmt_handler_.write<eMTLSyntaxElement::Ns>(mtl_material.Ns);
fmt_handler_.write<eMTLSyntaxElement::Ka>(
mtl_material.Ka.x, mtl_material.Ka.y, mtl_material.Ka.z);
fmt_handler_.write<eMTLSyntaxElement::Kd>(
mtl_material.Kd.x, mtl_material.Kd.y, mtl_material.Kd.z);
fmt_handler_.write<eMTLSyntaxElement::Ks>(
mtl_material.Ks.x, mtl_material.Ks.y, mtl_material.Ks.z);
fmt_handler_.write<eMTLSyntaxElement::Ke>(
mtl_material.Ke.x, mtl_material.Ke.y, mtl_material.Ke.z);
fmt_handler_.write<eMTLSyntaxElement::Ni>(mtl_material.Ni);
fmt_handler_.write<eMTLSyntaxElement::d>(mtl_material.d);
fmt_handler_.write<eMTLSyntaxElement::illum>(mtl_material.illum);
}
void MTLWriter::write_texture_map(
const MTLMaterial &mtl_material,
const Map<const eMTLSyntaxElement, tex_map_XX>::Item &texture_map)
{
std::string options;
/* Option strings should have their own leading spaces. */
if (texture_map.value.translation != float3{0.0f, 0.0f, 0.0f}) {
options.append(" -o ").append(float3_to_string(texture_map.value.translation));
}
if (texture_map.value.scale != float3{1.0f, 1.0f, 1.0f}) {
options.append(" -s ").append(float3_to_string(texture_map.value.scale));
}
if (texture_map.key == eMTLSyntaxElement::map_Bump && mtl_material.map_Bump_strength > 0.0001f) {
options.append(" -bm ").append(std::to_string(mtl_material.map_Bump_strength));
}
#define SYNTAX_DISPATCH(eMTLSyntaxElement) \
if (texture_map.key == eMTLSyntaxElement) { \
fmt_handler_.write<eMTLSyntaxElement>(options, texture_map.value.image_path); \
return; \
}
SYNTAX_DISPATCH(eMTLSyntaxElement::map_Kd);
SYNTAX_DISPATCH(eMTLSyntaxElement::map_Ks);
SYNTAX_DISPATCH(eMTLSyntaxElement::map_Ns);
SYNTAX_DISPATCH(eMTLSyntaxElement::map_d);
SYNTAX_DISPATCH(eMTLSyntaxElement::map_refl);
SYNTAX_DISPATCH(eMTLSyntaxElement::map_Ke);
SYNTAX_DISPATCH(eMTLSyntaxElement::map_Bump);
BLI_assert(!"This map type was not written to the file.");
}
void MTLWriter::write_materials()
{
if (mtlmaterials_.size() == 0) {
return;
}
std::sort(mtlmaterials_.begin(),
mtlmaterials_.end(),
[](const MTLMaterial &a, const MTLMaterial &b) { return a.name < b.name; });
for (const MTLMaterial &mtlmat : mtlmaterials_) {
fmt_handler_.write<eMTLSyntaxElement::string>("\n");
fmt_handler_.write<eMTLSyntaxElement::newmtl>(mtlmat.name);
write_bsdf_properties(mtlmat);
for (const Map<const eMTLSyntaxElement, tex_map_XX>::Item &texture_map :
mtlmat.texture_maps.items()) {
if (!texture_map.value.image_path.empty()) {
write_texture_map(mtlmat, texture_map);
}
}
}
}
Vector<int> MTLWriter::add_materials(const OBJMesh &mesh_to_export)
{
Vector<int> r_mtl_indices;
r_mtl_indices.resize(mesh_to_export.tot_materials());
for (int16_t i = 0; i < mesh_to_export.tot_materials(); i++) {
const Material *material = mesh_to_export.get_object_material(i);
if (!material) {
r_mtl_indices[i] = -1;
continue;
}
int mtlmat_index = material_map_.lookup_default(material, -1);
if (mtlmat_index != -1) {
r_mtl_indices[i] = mtlmat_index;
}
else {
mtlmaterials_.append(mtlmaterial_for_material(material));
r_mtl_indices[i] = mtlmaterials_.size() - 1;
material_map_.add_new(material, r_mtl_indices[i]);
}
}
return r_mtl_indices;
}
const char *MTLWriter::mtlmaterial_name(int index)
{
if (index < 0 || index >= mtlmaterials_.size()) {
return nullptr;
}
return mtlmaterials_[index].name.c_str();
}
/** \} */
} // namespace blender::io::obj
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