ENH: Format: Add ModelIO support on macOS

Github pull request: #2439

Change-Id: I4464a735a0a20b3e8103a344a64500b3d14b70e6

src/libslic3r/CMakeLists.txt

@@ -390,6 +390,8 @@ set(lisbslic3r_sources
 if (APPLE)
     list(APPEND lisbslic3r_sources
 			MacUtils.mm
+            Format/ModelIO.hpp
+            Format/ModelIO.mm
         )
 endif ()
 
@@ -505,6 +507,12 @@ if(NOT WIN32)
     endif()
 endif()
 
+if (APPLE)
+    find_library(FOUNDATION Foundation REQUIRED)
+    find_library(MODELIO ModelIO REQUIRED)
+    target_link_libraries(libslic3r ${FOUNDATION} ${MODELIO})
+endif ()
+
 if (TARGET OpenVDB::openvdb)
     target_link_libraries(libslic3r OpenVDB::openvdb)
 endif()

src/libslic3r/Format/ModelIO.hpp

@@ -0,0 +1,19 @@
+#include <string>
+
+namespace Slic3r {
+    /**
+     * Uses ModelIO to convert supported model types to a temporary STL
+     * that can then be consumed by the existing STL loader
+     * @param input_file The File to load
+     * @return Path to the temporary file, or an empty string if conversion failed
+     */
+    std::string make_temp_stl_with_modelio(const std::string &input_file);
+
+    /**
+     * Convenience function to delete the file.
+     * No return value since success isn't required
+     * @param temp_file File path to delete
+     */
+    void delete_temp_file(const std::string &temp_file);
+}
+

src/libslic3r/Format/ModelIO.mm

@@ -0,0 +1,27 @@
+#include "ModelIO.hpp"
+#import <ModelIO/ModelIO.h>
+
+namespace Slic3r {
+
+    std::string make_temp_stl_with_modelio(const std::string &input_file)
+    {
+        NSURL    *input_url = [NSURL fileURLWithPath:[NSString stringWithUTF8String:input_file.c_str()]];
+        MDLAsset *asset     = [[MDLAsset alloc] initWithURL:input_url];
+
+        NSString *tmp_file_name = [[[NSUUID UUID] UUIDString] stringByAppendingPathExtension:@"stl"];
+        NSURL    *tmp_file_url  = [NSURL fileURLWithPath:[NSTemporaryDirectory() stringByAppendingPathComponent:tmp_file_name]];
+
+        if ([asset exportAssetToURL:tmp_file_url]) {
+            std::string output_file = std::string([[tmp_file_url path] UTF8String]);
+            return output_file;
+        }
+
+        return std::string();
+    }
+    void delete_temp_file(const std::string &temp_file)
+    {
+        NSString *file_path = [NSString stringWithUTF8String:temp_file.c_str()];
+        [[NSFileManager defaultManager] removeItemAtPath:file_path error:NULL];
+    }
+
+} // namespace Slic3r

src/libslic3r/Model.cpp

@@ -40,6 +40,11 @@
 // Transtltion
 #include "I18N.hpp"
 
+// ModelIO support
+#ifdef __APPLE__
+#include "Format/ModelIO.hpp"
+#endif
+
 #define _L(s) Slic3r::I18N::translate(s)
 
 namespace Slic3r {
@@ -200,6 +205,18 @@ Model Model::read_from_file(const std::string& input_file, DynamicPrintConfig* c
         //FIXME options & LoadStrategy::CheckVersion ?
         //BBS: is_xxx is used for is_bbs_3mf when load 3mf
         result = load_bbs_3mf(input_file.c_str(), config, config_substitutions, &model, plate_data, project_presets, is_xxx, file_version, proFn, options, project, plate_id);
+#ifdef __APPLE__
+    else if (boost::algorithm::iends_with(input_file, ".usd") || boost::algorithm::iends_with(input_file, ".usda") ||
+             boost::algorithm::iends_with(input_file, ".usdc") || boost::algorithm::iends_with(input_file, ".usdz") ||
+             boost::algorithm::iends_with(input_file, ".abc") || boost::algorithm::iends_with(input_file, ".ply")) {
+        std::string temp_stl = make_temp_stl_with_modelio(input_file);
+        if (temp_stl.empty()) {
+            throw Slic3r::RuntimeError("Failed to convert asset to STL via ModelIO.");
+        }
+        result = load_stl(temp_stl.c_str(), &model);
+        delete_temp_file(temp_stl);
+    }
+#endif
     else
         throw Slic3r::RuntimeError(_L("Unknown file format. Input file must have .stl, .obj, .amf(.xml) extension."));
 

src/slic3r/GUI/GUI_App.cpp

@@ -739,7 +739,11 @@ static const FileWildcards file_wildcards_by_type[FT_SIZE] = {
     /* FT_AMF */     { "AMF files"sv,       { ".amf"sv, ".zip.amf"sv, ".xml"sv } },
     /* FT_3MF */     { "3MF files"sv,       { ".3mf"sv } },
     /* FT_GCODE */   { "G-code files"sv,    { ".gcode"sv } },
+#ifdef __APPLE__
+    /* FT_MODEL */   { "Supported files"sv,     { ".3mf"sv, ".stl"sv, ".stp"sv, ".step"sv, ".svg"sv, ".amf"sv, ".obj"sv , ".usd"sv, ".usda"sv, ".usdc"sv, ".usdz"sv, ".abc"sv, ".ply"sv} },
+#else
     /* FT_MODEL */   {"Supported files"sv,  {".3mf"sv, ".stl"sv, ".stp"sv, ".step"sv, ".svg"sv, ".amf"sv, ".obj"sv }},
+#endif
     /* FT_PROJECT */ { "Project files"sv,   { ".3mf"sv} },
     /* FT_GALLERY */ { "Known files"sv,     { ".stl"sv, ".obj"sv } },
 
@@ -3641,7 +3645,11 @@ void GUI_App::import_model(wxWindow *parent, wxArrayString& input_files) const
 {
     input_files.Clear();
     wxFileDialog dialog(parent ? parent : GetTopWindow(),
-        _L("Choose one or more files (3mf/step/stl/svg/obj/amf):"),
+#ifdef __APPLE__
+        _L("Choose one or more files (3mf/step/stl/svg/obj/amf/usd*/abc/ply):"),
+#else
+                 _L("Choose one or more files (3mf/step/stl/svg/obj/amf):"),
+#endif
         from_u8(app_config->get_last_dir()), "",
         file_wildcards(FT_MODEL), wxFD_OPEN | wxFD_MULTIPLE | wxFD_FILE_MUST_EXIST);